Percentage calculator.
Four everyday percentage sums in one place: a percentage of a number, what one number is of another, the change between two values, and adding or taking off a percentage. Results update as you type, and everything runs in your browser.
What is X% of Y?
Work out a percentage of any number. Handy for tips, discounts and tax.
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X is what percent of Y?
Find what percentage one number is of another. Handy for completion rates.
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Percentage change
Work out the increase or decrease between two values. Handy for tracking growth.
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Add or subtract a percentage
Increase or decrease a number by a percentage. Handy for markups and discounts.
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Quick reference formulas
X% of Y
(X / 100) × YX is ?% of Y
(X / Y) × 100Change
((New − Old) / Old) × 100Add / subtract
X × (1 ± P / 100)How do I reverse a percentage calculation?
To find the original number before a percentage was added, divide by (1 plus the percentage over 100). For example, if £120 includes 20 percent, the original was £120 divided by 1.20, which is £100.
What is the difference between percentage and percentage points?
Percentage points measure the absolute difference between two percentages. If interest rates go from 2 percent to 3 percent, that is one percentage point, but a 50 percent relative increase.
How do I calculate profit margin?
Profit margin is ((revenue minus cost) divided by revenue) times 100. If you sell for £100 what cost £60, your margin is ((100 minus 60) divided by 100) times 100, which is 40 percent.
Built by Dead Simple Computing, a Reading based IT and cyber security team. If a sum here turns into a bigger question, we are happy to help.
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