How to use this percentage calculator
Use this percentage calculator when you need a quick answer without working through the formula manually. Enter the base number and the percentage you want to calculate.
The result is calculated in your browser, so the tool is fast and does not send your numbers to a database.
Formula
Percentage amount = Base number × (Percentage ÷ 100)
Worked example
20% of 250 = 250 × 0.20 = 50.
Step-by-step
- Enter the base number.
- Enter the percentage value.
- Select Calculate to see the percentage amount, increased total, and decreased total.
Frequently asked questions
How do I calculate 15% of a number?
Multiply the number by 0.15. For example, 15% of 200 is 30.
How do I add a percentage to a number?
Find the percentage amount first, then add it to the original number.
Can I use decimal percentages?
Yes. Values such as 2.5% or 7.25% work normally.