General
Percentage Calculator
Work out what one number is as a percentage of another, and what a given percentage of a number comes to.
Result
Percentage difference is measured against the average of the two numbers, which is the symmetric definition. Percentage change from one value to another is a different calculation. Use the increase or decrease calculator for that.
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About this calculator
What is the difference between percentage change and percentage difference?
Percentage change has a direction: it measures movement from an original value to a new one, so the starting point matters. Percentage difference compares two values without either being 'first', so it divides by their average and is the same in both directions.
How do I calculate a percentage in my head?
Find 10% by moving the decimal one place left, then scale. For 15% of 240: 10% is 24, half of that is 12, so 15% is 36.
How do I remove a percentage that was added?
Divide, do not subtract. To strip 20% tax from a $120 total, divide by 1.20 to get $100. Subtracting 20% of $120 would wrongly give $96.
The formula
part ÷ whole × 100 = percentage
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