Percent of a percent calculator
Multiply two percentages to find what share of a share you get.
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Tool guide
Percent of a percent calculator: how it works
Practical information to understand the result and use this tool correctly.
About Percent of a percent calculator
Stacked percentages multiply as decimals: 30% of 40% is 0.12 of the whole, written 12%.
People often add rates by mistake (30+40=70). This calculator prevents that error.
An example card scales the combined rate onto a base of 1000 for intuition.
How to use it
- 1Enter the first percent and the second percent.
- 2Calculate the combined percent of the whole.
- 3Use the example-on-1000 card to sanity-check magnitude.
Frequently asked questions
- Compound interest?
- No — this multiplies two static rates, not growth over periods.
- Does order matter?
- No for the product of two rates.