Percentage Calculator – Calculate Percentages, Changes and Proportions Easily
Percentage calculator handles percentage calculations in different forms: what is X% of Y, what is X if it's Y% of the total, and what percentage is X of Y. Plus percentage change calculations.
The tool covers all common percentage calculations: sale prices, sales tax, salary changes, interest rates and statistical proportions. Enter values and select calculation type for results and explanations.
How to calculate percentage change?
Percentage change = (new value − old value) / old value × 100. If price increased from $80 to $100, change is (100−80)/80 × 100 = 25%. If it decreased from $100 to $80, change is (80−100)/100 × 100 = −20%. Note: a 25% increase and then decrease back is not the same as a 25% decrease — the percentage calculator shows both correctly.
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Browse all tools →The percentage calculator effortlessly calculates percentages, changes, and increases. An essential everyday tool for shopping, studies, and work life.
Enter numbers and the calculator computes percentages, percentage changes, or discounts.
- Calculate what percentage one number is of another number.
- Determine percentage change (increase or decrease) between two numbers.
- Calculate the final price after discount or increase.
Percentage calculation is mathematically precise – ensure your inputs are correct.
- Percentage change is always calculated relative to the original number.
- A 50% discount + 20% discount is not 70% – the second discount is calculated from the already discounted price.
- Percentage points and percentage are different – from 10% to 15% is a 5 percentage point change.
The percentage calculator is one of the most used everyday mathematical tools.
- When comparing offers, percentage tells relative change, while actual amounts tell absolute change.
- VAT percentage and discount percentage are calculated differently – check the context.
- The tool works in your browser – your data is not stored.