category,unit,name,value_in_base,base_unit,exact,sources,source_urls,note
length,mm,millimeter,0.001,m,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
length,cm,centimeter,0.01,m,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
length,m,meter,1,m,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
length,km,kilometer,1000,m,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
length,in,inch,0.0254,m,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
length,ft,foot,0.3048,m,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
length,yd,yard,0.9144,m,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
length,mi,mile,1609.344,m,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
length,nmi,nautical mile,1852,m,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,
length,mil,thousandth inch (mil),0.0000254,m,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
length,µm,micrometer,0.000001,m,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
mass,mg,milligram,0.000001,kg,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
mass,g,gram,0.001,kg,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
mass,kg,kilogram,1,kg,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
mass,t,metric ton,1000,kg,yes,"NIST SP 811, Appendix B.8; BIPM SI Brochure, 9th ed.",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
mass,oz,ounce,0.028349523125,kg,yes,"NIST SP 811, Appendix B footnotes; NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,16 oz = 1 lb
mass,lb,pound,0.45359237,kg,yes,"NIST SP 811, Appendix B footnotes; NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,
mass,st,stone,6.35029318,kg,yes,"NIST Handbook 44 (2026), Appendix C; UK Weights and Measures Act 1985, Schedule 1",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c https://www.legislation.gov.uk/ukpga/1985/72/schedule/1/enacted,stone = 14 lb (UK)
mass,ton-us,short ton (US),907.18474,kg,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,short ton 2000 lb
mass,ton-uk,long ton (UK),1016.0469088,kg,yes,"NIST Handbook 44 (2026), Appendix C; UK Weights and Measures Act 1985, Schedule 1",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c https://www.legislation.gov.uk/ukpga/1985/72/schedule/1/enacted,long ton 2240 lb
volume,mL,milliliter,0.001,L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
volume,L,liter,1,L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
volume,m³,cubic meter,1000,L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
volume,tsp-us,teaspoon (US),0.00492892159375,L,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,tsp = 1/3 tbsp
volume,tbsp-us,tablespoon (US),0.01478676478125,L,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,tbsp = 1/2 fl oz
volume,floz-us,fluid ounce (US),0.0295735295625,L,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,128 fl oz = 1 gal
volume,cup-us,cup (US),0.2365882365,L,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,cup = 8 fl oz (customary; US nutrition-label cup is 240 mL)
volume,pt-us,pint (US),0.473176473,L,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,
volume,qt-us,quart (US),0.946352946,L,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,
volume,gal-us,gallon (US),3.785411784,L,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,231 in³
volume,gal-uk,gallon (UK / imperial),4.54609,L,yes,"NIST SP 811, Appendix B.8; UK Weights and Measures Act 1985, Schedule 1",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.legislation.gov.uk/ukpga/1985/72/schedule/1/enacted,
volume,in³,cubic inch,0.016387064,L,yes,"NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,
volume,ft³,cubic foot,28.316846592,L,yes,,,
volume,cm³,cm³,0.001,L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
pressure,Pa,pascal,1,Pa,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
pressure,kPa,kilopascal,1000,Pa,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
pressure,MPa,megapascal,1000000,Pa,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
pressure,bar,bar,100000,Pa,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
pressure,mbar,millibar,100,Pa,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
pressure,psi,pound-force per square inch,6894.757293168361336722673,Pa,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,
pressure,ksi,kilopound per square inch,6894757.293168361336722673,Pa,yes,,,
pressure,atm,standard atmosphere,101325,Pa,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
pressure,torr,torr,133.3223684210526315789474,Pa,yes,"NIST SP 811, Chapter 5",https://www.nist.gov/pml/special-publication-811/nist-guide-si-chapter-5-units-outside-si,1 Torr = 101325/760 Pa exactly; mmHg(conv) = 133.322387415 Pa differs by 1.4e-7
pressure,inHg,"inch of mercury (conventional, 0 °C)",3386.388640341,Pa,no,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,"conventional inHg (13595.1 kg/m³ × gn × 1 in); B.8 3386.389. Also 32°F 3386.38, 60°F 3376.85"
pressure,inH2O,inch of water column (conventional),249.08891,Pa,no,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,"conventional inH2O 249.0889 (1000 kg/m³ × gn); also 39.2°F 249.082, 60°F 248.84"
pressure,mmH2O,mm of water column (conventional),9.80665,Pa,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,conventional mmH2O 9.80665 (bold/exact in B.8)
pressure,mmHg,mmHg,133.322387415,Pa,no,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,conventional mmHg 133.3224 (B.8)
energy,J,joule,1,J,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
energy,kJ,kilojoule,1000,J,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
energy,MJ,megajoule,1000000,J,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
energy,cal,calorie (thermochemical),4.184,J,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,thermochemical; cal_IT = 4.1868
energy,kcal,kilocalorie (food cal),4184,J,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,thermochemical kcal; kcal_IT = 4186.8
energy,Wh,watt-hour,3600,J,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
energy,kWh,kilowatt-hour,3600000,J,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
energy,BTU,BTU (International Table),1055.05585262,J,yes,"NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,"BTU_IT; Btu_th 1054.350, mean 1055.87, 39°F 1059.67, 59°F 1054.80, 60°F 1054.68"
energy,eV,electron-volt,1.602176634E-19,J,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
energy,ft·lbf,foot-pound (force),1.3558179483314004,J,yes,"NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,
power,W,watt,1,W,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
power,kW,kilowatt,1000,W,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
power,MW,megawatt,1000000,W,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
power,hp,horsepower (mechanical),745.69987158227022,W,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,"mechanical; electric 746, boiler 9809.5, metric 735.4988, UK 745.7"
power,hp-m,metric horsepower,735.49875,W,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,exact 75 kgf·m/s definition not stated on the fetched NIST pages
power,BTU/h,BTU per hour,0.2930710701722222222222222,W,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,
power,ton,ton of refrigeration,3516.852842066666666666667,W,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,
power,PS,PS,735.49875,W,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,metric hp
force,N,newton,1,N,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
force,kN,kilonewton,1000,N,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
force,lbf,pound-force,4.4482216152605,N,yes,"NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,
force,kgf,kilogram-force,9.80665,N,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Chapter 5",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-chapter-5-units-outside-si,
force,dyn,dyne,0.00001,N,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
force,ozf,ounce-force,0.27801385095378125,N,yes,,,
speed,m/s,meters per second,1,m/s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
speed,km/h,kilometers per hour,0.2777777777777777777777778,m/s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
speed,mph,miles per hour,0.44704,m/s,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
speed,ft/s,feet per second,0.3048,m/s,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
speed,kn,knot,0.5144444444444444444444444,m/s,yes,"NIST SP 811, Appendix B.8; NIST SP 811, Appendix B footnotes",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 https://www.nist.gov/pml/special-publication-811/nist-guide-si-footnotes,
speed,Mach,"Mach (sea level, ISA 15°C)",340.294,m/s,no,,,"no official definition; ISA sea-level speed of sound 340.294 m/s (ICAO/ISO 2533, not in allowed sources)"
area,mm²,square millimeter,0.000001,m²,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
area,cm²,square centimeter,0.0001,m²,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
area,m²,square meter,1,m²,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
area,km²,square kilometer,1000000,m²,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
area,in²,square inch,0.00064516,m²,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
area,ft²,square foot,0.09290304,m²,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
area,yd²,square yard,0.83612736,m²,yes,,,
area,acre,acre (international),4046.8564224,m²,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,international acre 4046.8564224; SP 811 (2008) lists survey acre 4046.873 (survey foot deprecated 2023-01-01 per HB44)
area,ha,hectare,10000,m²,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
time,ms,millisecond,0.001,s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
time,s,second,1,s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
time,min,minute,60,s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
time,h,hour,3600,s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
time,d,day,86400,s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
time,wk,week,604800,s,yes,,,
time,mo,month (30 d),2592000,s,no,,,"no official month; 30 d convention (other: 365/12 d = 30.4167 d, 365.2425/12 d)"
time,yr,year (365 d),31536000,s,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,"also sidereal 31558150, tropical 31556930, Julian 365.25 d"
data,b,bit,0.125,B,yes,,,
data,B,byte,1,B,yes,,,
data,KB,kilobyte (1000),1000,B,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,decimal
data,KiB,kibibyte (1024),1024,B,yes,"NIST, prefixes for binary multiples",https://physics.nist.gov/cuu/Units/binary.html,
data,MB,megabyte (1000²),1000000,B,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,decimal
data,MiB,mebibyte (1024²),1048576,B,yes,"NIST, prefixes for binary multiples",https://physics.nist.gov/cuu/Units/binary.html,
data,GB,gigabyte (1000³),1000000000,B,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,decimal
data,GiB,gibibyte (1024³),1073741824,B,yes,"NIST, prefixes for binary multiples",https://physics.nist.gov/cuu/Units/binary.html,
data,TB,terabyte,1000000000000,B,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,decimal
data,TiB,tebibyte,1099511627776,B,yes,"NIST, prefixes for binary multiples",https://physics.nist.gov/cuu/Units/binary.html,
angle,rad,radian,1,rad,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
angle,deg,degree,0.01745329251994329576923691,rad,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
angle,grad,gradian,0.01570796326794896619231322,rad,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
angle,arcmin,arcminute,0.0002908882086657215961539485,rad,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
angle,arcsec,arcsecond,0.000004848136811095359935899141,rad,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
angle,rev,revolution / turn,6.283185307179586476925287,rad,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
frequency,Hz,hertz,1,Hz,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
frequency,kHz,kilohertz,1000,Hz,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
frequency,MHz,megahertz,1000000,Hz,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
frequency,GHz,gigahertz,1000000000,Hz,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
frequency,rpm,revolutions per minute,0.01666666666666666666666667,Hz,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,1 rpm = 1/60 rev/s
frequency,rad/s,radians per second,0.1591549430918953357688838,Hz,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,SI Brochure warns frequency (Hz) and angular frequency (rad/s) must not be mixed
torque,N·m,newton-meter,1,N·m,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
torque,N·cm,newton-centimeter,0.01,N·m,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
torque,kN·m,kilonewton-meter,1000,N·m,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
torque,kgf·m,kilogram-force meter,9.80665,N·m,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
torque,kgf·cm,kilogram-force cm,0.0980665,N·m,yes,,,
torque,lbf·ft,pound-foot,1.3558179483314004,N·m,yes,,,
torque,lbf·in,pound-inch,0.1129848290276167,N·m,yes,,,
torque,ozf·in,ounce-inch,0.00706155181422604375,N·m,yes,,,
torque,dyn·cm,dyne-centimeter,1E-7,N·m,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
density,kg/m³,kilogram per cubic meter,1,kg/m³,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
density,g/cm³,gram per cubic centimeter,1000,kg/m³,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
density,g/mL,gram per milliliter,1000,kg/m³,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
density,kg/L,kilogram per liter,1000,kg/m³,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
density,g/L,gram per liter,1,kg/m³,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
density,lb/ft³,pound per cubic foot,16.01846337396013957965507,kg/m³,yes,,,
density,lb/in³,pound per cubic inch,27679.90471020312119364396,kg/m³,yes,,,
density,lb/gal-us,pound per US gallon,119.8264273168966285439133,kg/m³,yes,,,
density,lb/gal-uk,pound per imperial gallon,99.77637266310169838256612,kg/m³,yes,,,
density,oz/in³,ounce per cubic inch,1729.994044387695074602748,kg/m³,yes,,,
density,slug/ft³,slug per cubic foot,515.3788183931962034410249,kg/m³,yes,,,
flow,m³/s,cubic meter per second,1,m³/s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
flow,m³/h,cubic meter per hour,0.0002777777777777777777777778,m³/s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
flow,L/s,liter per second,0.001,m³/s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
flow,L/min,liter per minute,0.00001666666666666666666666667,m³/s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
flow,L/h,liter per hour,2.777777777777777777777778e-7,m³/s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
flow,mL/min,milliliter per minute,1.666666666666666666666667e-8,m³/s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
flow,cfm,cubic feet per minute,0.0004719474432,m³/s,yes,,,
flow,cfs,cubic feet per second,0.028316846592,m³/s,yes,,,
flow,cfh,cubic feet per hour,0.00000786579072,m³/s,yes,,,
flow,gpm-us,gallon (US) per minute,0.0000630901964,m³/s,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,
flow,gph-us,gallon (US) per hour,0.000001051503273333333333333333,m³/s,yes,"NIST Handbook 44 (2026), Appendix C",https://www.nist.gov/document/2026-nist-handbook-44-appendix-c,
flow,gpm-uk,gallon (UK) per minute,0.00007576816666666666666666667,m³/s,yes,"UK Weights and Measures Act 1985, Schedule 1",https://www.legislation.gov.uk/ukpga/1985/72/schedule/1/enacted,
flow,bbl/d,oil barrel per day,0.000001840130728333333333333333,m³/s,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
acceleration,m/s²,meter per second squared,1,m/s²,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
acceleration,cm/s²,cm per second squared,0.01,m/s²,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
acceleration,ft/s²,foot per second squared,0.3048,m/s²,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
acceleration,in/s²,inch per second squared,0.0254,m/s²,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
acceleration,g,gram,9.80665,m/s²,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
acceleration,gal,"galileo (gal, cm/s²)",0.01,m/s²,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
acceleration,mg-acc,milli-g (1/1000 g),0.00980665,m/s²,yes,,,
acceleration,km/h/s,km/h per second,0.2777777777777777777777778,m/s²,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
acceleration,mph/s,mph per second,0.44704,m/s²,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
viscosity,Pa·s,pascal-second,1,Pa·s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
viscosity,mPa·s,millipascal-second,0.001,Pa·s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
viscosity,P,poise,0.1,Pa·s,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
viscosity,cP,centipoise,0.001,Pa·s,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
viscosity,kg/(m·s),kg per meter-second,1,Pa·s,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
viscosity,lbf·s/ft²,pound-force·s / ft²,47.88025898033584261612968,Pa·s,yes,,,
viscosity,lbf·s/in²,reyn (lbf·s / in²),6894.757293168361336722673,Pa·s,yes,,,
viscosity,lb/(ft·s),pound per foot-second,1.488163943569553805774278,Pa·s,yes,,,
luminance,lx,lux (lumen / m²),1,lx,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
luminance,fc,foot-candle (lumen / ft²),10.76391041670972230833351,lx,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
luminance,ph,phot (lumen / cm²),10000,lx,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
luminance,nox,nox (1/1000 lux),0.001,lx,yes,,,
luminance,lm/m²,lumen per m² (= lux),1,lx,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
luminance,lm/ft²,lumen per ft²,10.76391041670972230833351,lx,yes,,,
concentration,mg/L,milligram per liter,1,mg/L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
concentration,µg/L,microgram per liter,0.001,mg/L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
concentration,g/L,gram per liter,1000,mg/L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
concentration,kg/L,kilogram per liter,1000000,mg/L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
concentration,ppm,parts per million (mg/L in water),1,mg/L,no,,,ppm = mg/L only for dilute aqueous solutions (density 1 kg/L); SP 811 discourages ppm
concentration,ppb,parts per billion (µg/L in water),0.001,mg/L,no,,,as ppm
concentration,ppt,parts per trillion (ng/L),0.000001,mg/L,no,,,ppt ambiguous (trillion vs thousand)
concentration,%w/v,percent weight/volume (g/100mL),10000,mg/L,yes,,,
concentration,g/100mL,gram per 100 mL,10000,mg/L,yes,"BIPM SI Brochure, 9th ed.",https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf,
concentration,oz/gal-us,ounce per US gallon (mass),7489.151707306039283994578,mg/L,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,
concentration,gr/gal-us,grain per US gallon,17.11806104527094693484475,mg/L,yes,"NIST SP 811, Appendix B.8",https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8,