Two ways to use it
- Percent increase between two numbers: enter the original and the new value in the first card to see how much it grew, in percent.
- Increase a number by a percent: in the second card, enter a number and a percentage to get the new total, for example a salary after a 3% raise or a price after a 15% increase.
Formulas
Percent increase = (new − original) ÷ original × 100. A rent going from 1,200 to 1,290 is a 90 ÷ 1,200 × 100 = 7.5% increase. To add a percentage, multiply by (1 + percent ÷ 100): 200 increased by 15% is 200 × 1.15 = 230. The calculation is shown under each answer so you can check it or copy it into a report.
Repeated increases compound: two 10% rises make 21%, not 20%, because the second 10% applies to the already larger number. For yearly growth over several years, the compound interest or inflation calculators handle that for you.
To reverse a percentage increase and find the original price before VAT or a markup, divide by (1 + percent ÷ 100) instead of subtracting the percent; the reverse card further down does exactly that.
FAQ
How do I add 20% to a number?
Multiply it by 1.2. For example, 85 + 20% = 85 × 1.2 = 102.
What is the percentage increase from 40 to 50?
25%: the increase of 10 divided by the original 40.
How do I calculate a pay rise percentage?
Enter your old salary and new salary in the first card. The result is your raise in percent.