Online percentage calculator for everyday math
Compute percentages: X% of Y, proportion, percentage change, in your browser.
% of =16
is what % of =25 %
Change from to =+25 %
Three common percentage calculations, in real time and 100% local.
🔒 100% client-side — no data sent
Quickly compute X% of Y, an increase, a discount or a proportion between two numbers. A simple tool for markups, VAT, statistics or dashboards. All calculations run 100% in your browser.
What is it for?
- ▸ Calculate the price after a 20% discount on an item
- ▸ Find the percentage increase between two values
- ▸ Add or remove VAT from a net amount
- ▸ Determine what proportion a number represents out of a total
FAQ
How do I calculate a percentage of a number?
Multiply the number by the percentage then divide by 100. For example, 20% of 150 equals 150 × 20 ÷ 100, which is 30. The tool does it for you instantly.
How do I calculate a percentage increase?
Subtract the old value from the new one, divide the result by the old value, then multiply by 100 to get the increase rate.
How do I find the total from a percentage?
If you know that 30 is 20% of the total, divide 30 by 20 then multiply by 100: the total is 150.