Free Online Calculators
Everyday arithmetic, percentages, and compound growth.
Some math deserves a dedicated tool rather than mental gymnastics. The Everyday Calculator handles quick arithmetic with proper order of operations, parentheses, and a percent key that behaves exactly as documented. The Percentage Calculator answers the three questions people ask constantly — what percent X is of Y, X percent of a number, and percent increase or decrease — with results updating as you type. The Compound Interest Calculator projects investment growth from your starting amount, monthly contributions, rate, compounding frequency, and time horizon, showing both the future balance and the interest earned. No apps to install and no accounts to create: type your numbers, read the answer, copy it if you need it.