Percentage calculator
Each line is a question in plain words. Fill in the blanks and the answer follows.
- Five questions at once
- Rise and fall
- Backwards too
What is% of?
is what % of?
The change fromto
by%
is% of what?
Runs entirely in your browser. Nothing you enter is sent or stored.
The five formulas
A percentage is a fraction of one hundred, nothing more. Every question about percentages is one of these five, asked forwards or backwards.
Percent and percentage points
A rate that goes from 10% to 15% has risen by 5 percentage points, and by 50 percent: 5 is half of 10. The two are often confused, and the difference is large. When the figures being compared are themselves percentages, say which one you mean.
A percentage does not undo itself
Take 20% off 100 and you have 80. Add 20% back and you have 96, not 100, because the second 20% is taken on a smaller number. To return to the start after a drop of 20% you need a rise of 25%. The last line of the calculator answers that kind of question: 80 is 80% of what?
Pricing a product? The margin and markup calculator works on the same principle.
Made by Mystya.
We are a web studio in Québec. These tools are free and will stay free: they are how we show what we care about, in something you can use. If you want a site built with the same attention, we would like to hear about it.