The everyday toolkit

Percentage Calculator

Find a percentage of a number, a percentage share, or a percentage change.

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Enter your values

Your result

A clear answer starts here.

Enter your values and choose Calculate to see the result. Changing a value clears the previous answer.

Results are rounded to two decimal places for display. Calculations use unrounded values. Use the same currency for all monetary inputs.

Use this calculator

Choose a calculation mode when available and read the labels for its inputs.
Enter your own values. Use consistent units and enter percentages as 10 for 10%, rather than 0.10.
Select Calculate, then review all displayed results together with the formula and assumptions below.
Change one value to compare scenarios. Use Reset to return to the worked example.

How this calculator works

A percentage share requires a whole greater than zero. Percentage change uses the starting value as its base.

Percentage of a number = number × percentage ÷ 100. Share = part ÷ whole × 100. Change = (ending − starting) ÷ starting × 100.

Worked example

15% of 200 gives result of 30.00. Use the form above to enter your own values. Monetary examples are in the same currency throughout.

Questions about this calculation

Which calculation should I choose?

Use percentage of a number for 15% of 200, share for 30 out of 200, and change for a movement from 200 to 230. Share and change require a nonzero base.

Can a percentage change be negative?

Yes. An ending value below the starting value gives a negative percentage change. A change from 200 to 150 is −25%.