Percentage Calculator
Three calculations covering nearly everything "what's X% of Y" ever means.
The three percentage calculations people actually need
Almost every real-world percentage question falls into one of three shapes: what percentage is one number of another (12 out of 80 people, say), how much did a value increase or decrease by (a bill going from £45 to £52), or what was the original value before a known percentage change was applied (working backward from a discounted price). This calculator covers all three, since each uses a slightly different formula and mixing them up is the most common source of percentage mistakes.
Frequently asked questions
How do I calculate a percentage increase?
Subtract the old value from the new value, divide by the old value, then multiply by 100. A rent rise from £1,200 to £1,380 is (1380−1200)÷1200×100 = 15%.
How do I find what percentage one number is of another?
Divide the part by the whole, then multiply by 100. 30 out of 250 is (30÷250)×100 = 12%.
How do I find the original value before a percentage change?
Divide the new value by (1 plus the percentage change as a decimal) for an increase, or (1 minus the percentage change) for a decrease. If £80 is a price after a 20% discount, the original was 80 ÷ 0.8 = £100.
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