About the Percentage Calculator
Solve every common percentage problem in one place: X% of Y, what percent X is of Y, percentage increase/decrease between two values, and adding or subtracting a percentage. Every answer shows the formula and steps.
Because each mode shows its working, it doubles as a learning aid for students and a verification tool for professionals.
How to use the Percentage Calculator
- Pick the question type from the tabs.
- Enter your two numbers.
- Read the instant answer plus the step-by-step formula.
Common uses
Calculating discounts and sale prices
Working out tax amounts
Measuring growth between two periods
Homework verification with steps
Frequently asked questions
How do I calculate a percentage increase?
Subtract the old value from the new, divide by the old value, multiply by 100. The tool shows this working for your numbers.
What is X% of Y?
Multiply Y by X and divide by 100 — e.g. 15% of 80 = 80 × 15 ÷ 100 = 12.
Percentage difference vs percentage change?
Change is measured relative to the original value (direction matters); difference is relative to the average of the two values.
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