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Verified calculator with a transparent formula

Math

Add Percentages Calculator.

Adds two or more percentages together and shows the total percentage. Useful for combining discounts, tax rates, or growth rates.

Results update live as you type.
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Your inputs

How it works

  1. 1

    Enter the first percentage.

  2. 2

    Enter the second percentage.

  3. 3

    Optionally enter a third percentage.

  4. 4

    The calculator sums all percentages to give the total.

percentage1 + percentage2 + percentage3

Frequently asked questions

Can I add more than three percentages?

This calculator supports up to three percentages. For more, you can add them manually or use a spreadsheet.

What if I enter a percentage greater than 100?

The calculator allows values up to 100, but you can still add percentages that exceed 100 if you need to, though the input limits prevent that. For larger values, consider using a different tool.

Is adding percentages the same as adding their decimal equivalents?

Yes, adding percentages directly is equivalent to adding their decimal forms (e.g., 10% + 20% = 0.10 + 0.20 = 0.30 = 30%).

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Results

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Total Percentage

0%

Ask Anything

Estimate for general guidance only — verify important decisions with an appropriate professional.

How it works

Adds two or more percentages together and shows the total percentage. Useful for combining discounts, tax rates, or growth rates.

  1. Enter the first percentage.
  2. Enter the second percentage.
  3. Optionally enter a third percentage.
  4. The calculator sums all percentages to give the total.

Formulas

The math behind this calculator, written out so you can verify the result.

Sum of Percentages

Total % = P1 + P2 + P3

Simply add the percentage values together. This works when percentages are independent and you want the combined total percentage.

Example:

Input: P1 = 10%, P2 = 20%, P3 = 0%

Calculation: 10 + 20 + 0

Result: 30%

Real-world use cases

Where this calculation shows up in everyday life.

Combining Discounts

When you have multiple discounts on an item, add them to see the total discount percentage.

Example: 10% off plus 20% off gives 30% off.

Adding Tax Rates

If different tax rates apply to parts of a purchase, add them to get the total tax percentage.

Example: State tax 5% + local tax 2% = 7% total tax.

Growth Rates

When growth rates are additive (e.g., sequential increases), sum them for the overall growth percentage.

Example: Year 1 growth 3% + Year 2 growth 4% = 7% total growth.

Tips and common mistakes

Tips

  • Ensure all percentages are in the same units (%).
  • Use this calculator for simple additive percentages, not for compound growth.
  • If you need to add more than three percentages, do it in groups or use a spreadsheet.
  • Double-check your inputs for typos, especially decimal points.

Common Mistakes to Avoid

  • Mistaking additive percentages for compound percentages (e.g., 10% + 20% is not the same as a 10% increase followed by a 20% increase).
  • Forgetting to include a zero for unused optional fields.
  • Entering percentages as decimals (e.g., 0.1 instead of 10).

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.