％ Percentage Calculator
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🎂 Age Calculator
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Next birthday in—
📏 Unit Converter
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⛽ Fuel Cost Calculator
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Percentage calculations made simple
Three of the most common percentage questions are covered here: finding a percentage of a number (X% of Y), working out what proportion one number is of another (X is what % of Y), and measuring percentage change between two values. Each uses the same underlying idea — a percentage is just a fraction out of 100.
Converting units accurately
Length and weight convert with fixed ratios, while temperature uses formulas (°F = °C × 9/5 + 32). Our converter keeps common everyday units in one place so you don't have to remember the maths.
More tools: Days Between Dates — count the exact days, weeks and business days between any two dates.