About MathBench

MathBench is an independent collection of free online calculators for construction projects, engineering work, personal finance planning, and lab math. No account, no paywall, no spreadsheet download required: open the page, enter your numbers, get an answer you can check.

Why every tool shows its work

Most calculator sites give you a number without the working behind it. If that number is wrong (or based on assumptions that don't fit your situation), you have no way to know. Every MathBench tool publishes the formula it uses, a worked example you can verify by hand, and the assumptions baked into the result (waste factors, densities, tax rates, code limits). If you disagree with an assumption, you can adjust for it, because you can see it.

How the calculators are checked

• Formulas come from published references: engineering textbooks, manufacturer data sheets, standards, and government sources. Every calculator that leans on one lists it in a Sources section at the foot of the page, linked where the publisher makes the document freely available.
• Every tool is tested against a known-good worked example before it goes live. That same example appears on the page so you can re-run it.
• Finance figures that change annually (tax rates, wage bases, contribution limits) are dated on the page so you know which year they apply to.

Who runs this site

MathBench is built by a small team of engineers of various disciplines such as mechanical engineering, chemical engineering, and applied math. After building, everything (the formulas, the constants, and the worked example on every page) is extensively reviewed before a tool goes live.

Most calculators reference external educational sources and links to further learning material.

Corrections

Found a number that looks wrong? Please tell us. Corrections are reviewed and shipped quickly, and we'd rather fix an error than defend one.