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Date calculator
Find the number of calendar days between dates.
Everyday math
Percentage calculator
Calculate percentages, proportions and changes.
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How to use
- Choose percentage of a number, part of a whole or percentage change.
- Enter the base first, then the percentage or comparison value.
- Calculate and read the result for your selected mode.
How it works
Percentage of a number = base × percent ÷ 100. Proportion = part ÷ whole × 100. Change = (new − original) ÷ original × 100.
Common questions
How are decreases shown?
A decrease has a negative sign. Going from 200 to 150 gives −25%.
Can the original value be zero?
Proportions and changes cannot use a zero denominator. Percentage of a number can use a zero base.
Is this percentage points?
No. Moving from 10% to 15% is 5 percentage points, but a relative increase of 50%.