Percentage Calculator Guide
What is the Percentage Calculator?
The Percentage Calculator solves three of the most common percentage problems instantly. Whether you need to find a percentage of a number, calculate the percentage change between two values, or determine what percentage one number is of another, this tool has you covered.
How to calculate it manually
% of number: (percentage ÷ 100) × number. % change: ((new − old) ÷ |old|) × 100. X is what % of Y: (X ÷ Y) × 100.
Frequently Asked Questions
Multiply 240 by 0.15 (which is 15 ÷ 100). 240 × 0.15 = 36. So 15% of 240 is 36.
Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from £80 to £100 is a 25% increase: (100−80)/80 × 100 = 25%.
Finding the original value before a percentage change was applied. If a price is £120 after a 20% increase, the original was £120 ÷ 1.20 = £100.
Multiply the original price by the discount rate: £80 × 0.25 = £20 saving. Subtract to get the final price: £80 − £20 = £60.