Percentage Calculator
Calculate percentages, percentage increase or decrease, reverse percentages, percentage difference, percentage points, ratios, marks and common everyday percentage problems.
Calculator
Enter the percentage you want to calculate.
Enter the number the percentage applies to.
Choose whether the percentage is added or subtracted.
Control how many decimals are shown.
Quick examples
Load common percentage problems instantly.
Worked steps
Related percentage facts
Common percentage shortcuts
| Percentage | Shortcut | Value of B |
|---|
How percentage calculations work
A percentage means “out of 100”. To find a percentage of a number, divide the percentage by 100 and multiply by the number.
Percentage increase and decrease compare the change between an old value and a new value.
Reverse percentages work backwards from the final value by dividing by the percentage multiplier.
Common uses for percentages
Shopping and discounts
Work out sale prices, discount amounts, VAT, tips and price changes.
School and exams
Convert marks into percentages and compare scores out of different totals.
Business and finance
Calculate growth rates, margins, commission, interest and target changes.
Everyday comparisons
Compare two values fairly using percentage difference or percentage change.