How to use
- Enter the starting value.
- Enter the ending value.
- Read the percent increase and the formula filled in with your numbers.
Worked example: Website visitors from 8,000 to 9,800
The increase is 9,800 − 8,000 = 1,800. Divided by the start, 1,800 ÷ 8,000 = 0.225, so visitors rose 22.5%.
To apply the same growth again: 9,800 × 1.225 = 12,005. Percent increases compound, so two 22.5% rises are a 50.06% rise, not 45%.
Frequently asked questions
What is the percent increase formula?
(end − start) ÷ |start| × 100. From 80 to 100 is a 25% increase.
What if the end value is smaller?
Then it is a decrease. The result is negative and the calculator notes it. Use the percent decrease tab for a positive number.
How do I add a percent increase to a number?
Multiply by (1 + percent ÷ 100). 80 increased by 25% is 80 × 1.25 = 100.
Can the increase be more than 100%?
Yes. From 50 to 150 is a 200% increase, because the gain of 100 is twice the start.
Why not divide by the end value?
Because the question is how much the start grew. Dividing by the end gives a different, smaller number that answers a different question.
Does it handle a zero start?
A start of zero has no defined percent increase; the calculator shows not defined.