Simple, private calculators for percentages, tips and everyday money questions. Every result comes with a plain-English explanation of how it was worked out.
Work out X% of Y, what percent X is of Y, or the percent change between two numbers.
Work out the tip, total bill, and amount per person when splitting.
Convert between currencies using live, daily-updated exchange rates.
Each tool uses a standard, widely taught formula. Every page explains the formula and walks through how the result was worked out.
Everything is calculated in your browser. The numbers you type in are not sent to our servers or stored.
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