Calxy

Calculators that explain themselves

Most calculators hand you a number and stop. Every tool here shows the formula it used, the values it substituted, and where the result stops being trustworthy — because a monthly payment you cannot check is not much use when you are deciding whether to sign.

Everything runs in your browser. Nothing you type is transmitted, logged, or stored, and there is no account to create.

Where most people start

The mortgage calculator estimates a full monthly payment — principal, interest, taxes, insurance, and PMI — then shows the amortization schedule and how much sooner extra payments retire the loan. The percentage calculator answers all four common percentage questions on one page, and the BMI calculator reports your index alongside a candid account of what BMI cannot tell you.

For everyday arithmetic, try the age calculator, tip calculator, discount calculator, or the scientific calculator with full trigonometry and logarithms.

About Calxy

Calxy is a free reference of 30 calculators across finance, fitness and health, math, unit conversion, and everyday planning. Each page documents the method it uses and answers the questions people actually ask, so you leave understanding the number rather than just holding it.