About this tool
This Percentage Calculator solves the three most common percentage questions in daily life: finding X% of a number, working out what percent one number is of another, and calculating a percentage increase or decrease. It is ideal for discounts, tips, grades, taxes and statistics. Just enter your numbers and get the answer instantly.
How to use
- 1Pick the type of percentage question.
- 2Enter the two values.
- 3Read the calculated result instantly.
Benefits
- Three calculators in one.
- Handles discounts and percentage change.
- Instant, accurate answers.
Check the percentage question first
Practical example
“What is 20% of 80?” gives 16, while “16 is what percent of 80?” gives 20%. The same numbers produce different outputs because the unknown value changes.
Interpreting the result
Identify the base value before entering numbers. Increases and decreases should normally be measured against the original value, unless the problem explicitly defines another baseline.
Limits and common mistakes
Rounding can create small differences in financial reports and repeated percentage changes are not additive. A 20% rise followed by a 20% fall does not return to the starting value.
Detailed guides for this tool
Learn the underlying concepts, worked examples and common mistakes before relying on the result.
Frequently asked questions
How do I calculate a discount?+
Use the first calculator: enter the discount percentage and the original price to see the saving.
Can it show a percentage increase?+
Yes. The change calculator gives you the increase or decrease between two values.