Percentage Calculator
Work out a percentage of a number, percentage change, an increase or decrease by a percentage, and what percent one number is of another.
Your results
Calculation breakdown
- Percentage of a number
- (percentage ÷ 100) × value
- Percentage change
- ((to − from) ÷ |from|) × 100
- Increase / decrease by %
- base × (1 ± percentage ÷ 100)
- X is what % of Y
- (X ÷ Y) × 100
How this calculator works
Find a percentage of a number, work out what one number is as a percentage of another, or calculate a percentage increase or decrease between two values.
Frequently asked questions
How do I calculate a discount?
Enter the discount percentage and the original price — the decrease result is the sale price.
How do I work out percentage change?
Divide the change by the original value and multiply by 100.
Is GST just a percentage?
Yes, but removing it requires dividing by 11 rather than subtracting 10%. Use the GST Calculator.
Content responsibility
Maintained by CalcAussie and last updated 13 October 2026. Checks applied: calculation method, worked examples, Australian terminology, material assumptions, official references where an external rule applies, and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.