About unitcheatsheet.com

unitcheatsheet.com is a modern engineering and scientific unit reference, built for the people who actually use units every day — engineers, electricians, machinists, lab scientists, woodworkers, students, and the curious.

What it is

A free, fast, mobile-friendly site combining three things you usually find scattered across different sites:

• A universal converter for the 14 most common unit categories. Real conversion factors, no rounding shortcuts.
• A library of cheat sheets — wire gauges, drill bits, thread specs, pipe sizes, fastener torque, and dozens of others. Designed to be screenshot, printed, or shared.
• Multi-input calculators for the questions a simple converter can't answer — like "what wire size do I need given my amperage and run length and allowable voltage drop?"

Why it exists

The existing tools in this space fall into two camps. On one side: dense engineering reference sites that haven't been redesigned in 15 years, hard to use on mobile, with values you have to take on faith. On the other: shiny consumer converters that handle "kg to pounds" but fall apart the moment you need something specific.

This site sits in the middle: accurate, professional reference content with a modern UX. The cheat sheets are designed so well that you'd actually print one and pin it to your wall. The values cite their sources (NEC, ASTM, ISO, IEC) so you can use them in real work, not just homework.

What it isn't

It's not AI-generated. Every cheat sheet is hand-laid-out. Every calculator's math is derived from named standards. Every value is sourced. If a number is wrong, that's on us, not on a language model that hallucinated it.

It's also not a replacement for professional engineering judgment. The disclaimers on the safety-critical pages (electrical, structural, medical) are there because they have to be.