About WorkedMath

WorkedMath is a free collection of calculators covering number theory, statistics, algebra, and geometry. It started as one calculator and grew from there. The goal has stayed the same: show the actual method behind an answer, not just the number itself, so you can check your own work instead of just copying a result.

Everything runs in your browser. Your numbers never leave your device.

How each calculator is checked

Every formula is checked against known reference values before it goes live, not just run once and trusted. Default examples are worked out independently first, then compared against what the live calculator actually produces — catching real mistakes before they ship rather than after. A few genuine errors were caught this way during development: a rounding bug in the decimal-place calculator, an interpolation error in a written worked-example, and a stale default value that didn't match its own formula. Each was fixed and re-verified against the corrected math, not just patched and assumed right.

The methods behind each calculator aren't invented here — they're standard, textbook math: Euclid's algorithm for GCF, the quadratic formula, the law of sines and cosines, standard statistical formulas for variance and standard deviation. The calculators exist to make those standard methods fast and show the work, not to introduce a new way of doing the math.

Who built this

Elbert Ballo built WorkedMath and checks it alone. The rounding bug in the decimal-place calculator and the interpolation error in a worked example, both mentioned above, were caught by the same habit: working an example out by hand before trusting what the live calculator actually returns -- a habit that gets easier to skip as the collection grows past the single calculator it started as.