Percentage Calculator
All three classic percentage questions, answered live.
12
15%
+30%
FAQ
How do I calculate X% of a number?
Multiply the number by X and divide by 100. 15% of 80 = 80 × 15 ÷ 100 = 12.
How do I work out percent change?
(new − old) ÷ old × 100. From 50 to 65 that's (65−50)÷50×100 = +30%.
Why does percent change direction matter?
A 50% drop needs a 100% rise to recover — percent changes aren't symmetric because the base changes.