Percentage Calculator: Find a Percent, Increase or Difference
Percentage calculations appear in discounts, comparisons, reports and everyday budgeting. Choose the calculation type that matches your question, enter the values and verify the result context.
Choose the percentage calculation
- Select whether you need a percent of a number, percent share, or percentage change.
- Enter the values requested by the selected calculation.
- Choose Calculate and review the displayed percentage or amount.
- Check which value is the original and which is the comparison value.
- Confirm taxes, fees or rounding separately when the result is used for money.
Three common percentage questions
“What is 15% of 80?” asks for a percentage amount. “20 is what percent of 80?” asks for a share. “What is the percent change from 80 to 100?” compares a new value with a baseline.
Select the correct baseline
Percentage increase and decrease depend on the original value used as the denominator. Reversing the baseline can produce a different percentage.
Frequently asked questions
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value and multiply by 100.
Is percentage change symmetric?
No. Increasing from one baseline to another and then reversing the comparison can produce different percentage changes.
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