Math calculator
Percentage Calculator
Solve common percentage questions, including percent of a number and percentage change.
Formula
Percentage formulas
Percent of number = number x percent / 100; change % = (new - old) / old x 100
15% of 240 is 240 x 15 / 100 = 36. A change from 80 to 100 is 25%.
FAQs
How do I calculate a percentage of a number?+
Multiply the number by the percentage and divide by 100.
How is percentage change calculated?+
Subtract the old value from the new value, divide by the old value, then multiply by 100.
How does the Percentage Calculator calculate the result?+
It uses the Percentage formulas: Percent of number = number x percent / 100; change % = (new - old) / old x 100. 15% of 240 is 240 x 15 / 100 = 36. A change from 80 to 100 is 25%.
What information do I need to use the Percentage Calculator?+
Solve common percentage questions, including percent of a number and percentage change.
How accurate is the Percentage Calculator?+
Percentage Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Percentage Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Math guide
How to use the Percentage Calculator
Solve common percentage questions, including percent of a number and percentage change. The page also explains the percentage formulas and shows a practical example: 15% of 240 is 240 x 15 / 100 = 36. A change from 80 to 100 is 25%.
- 1
Enter your details
Enter the values for the percentage calculator scenario you want to check.
- 2
Check the calculation
Review the result alongside the percentage formulas: Percent of number = number x percent / 100; change % = (new - old) / old x 100.
- 3
Compare scenarios
Change one or more inputs to see how they affect the percentage Calculator result before you use the estimate.
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