All tools
Free Online Calculators
Every calculator runs entirely in your browser — no signup, no uploads, no waiting. Pick a tool below; each page includes the formulas behind it and answers to the questions people actually ask.
Money
Finance Calculators
Mortgage
Mortgage Calculator
Monthly payment, total interest, payoff date, and extra-payment savings.
Investing
Compound Interest Calculator
Project long-term growth with monthly contributions and a visual curve.
Currency
Currency Converter
Daily exchange rates for USD, EUR, GBP, JPY, CNY and more major currencies.
Publishers
Creator & Ad Revenue Tools
Health
Health & Fitness Calculators
Everyday