Percentages Calculator
Calculate 4 types of percentages interactively. Enter any two values and discover the third — perfect for discounts, interest rates, growth tracking, and more.
What is a Percentage?
A percentage is a way of expressing a number as a fraction of 100. It is often denoted using the percent sign (%). Percentages are used everywhere — from calculating discounts while shopping to understanding statistics in news reports.
The word 'percentage' comes from Latin 'per centum', meaning 'by the hundred'. In any percentage calculation, there are always three key values: the total (whole), the part (portion), and the percentage itself. Knowing any two lets you find the third.
How to Use This Calculator
This calculator uses a 'fill two, find one' approach. Simply enter values in any two of the three fields, then click Calculate to discover the missing value.
- Choose a calculation mode (Discount, Increase, Interest, or Progress).
- Enter numbers in exactly 2 of the 3 input fields.
- Click Calculate to see the result instantly.
Core Formulas
All percentage calculations are based on these three fundamental formulas. The calculator automatically selects the right formula based on which fields you fill in.
When Are Percentages Used?
Discount
Shopping & Sales — Find how much you save or what the final price is after a discount.
Increase
Growth & Markup — Calculate price increases, salary raises, or population growth.
Interest
Finance & Banking — Determine interest earnings on savings deposits or loans.
Progress
Goals & Tracking — Measure completion percentage of tasks, levels, or projects.
Frequently Asked Questions
Have another question? Let us know.
What is a percentage of a number?
To find a percentage of a number, multiply the number by the percentage divided by 100. For example, 20% of 150 = 150 × 0.20 = 30.
How do I calculate what percentage one number is of another?
Divide the part by the whole, then multiply by 100. For example, if you scored 45 out of 60 on a test: (45 ÷ 60) × 100 = 75%.
Where are percentages used in real life?
Percentages are everywhere: store discounts, tax rates, interest rates on loans and savings, exam scores, nutrition labels, opinion polls, population growth statistics, and much more.
What is the difference between percentage and percentage point?
A percentage is a relative value (e.g., 5% of something), while a percentage point is an absolute difference between two percentages. An increase from 10% to 15% is a 5 percentage point increase, but a 50% relative increase.
Can a percentage be greater than 100%?
Yes! Percentages over 100% mean the part exceeds the whole. Examples include profit margins over cost, growth rates exceeding original values, or completing more than 100% of a goal.
How do I calculate a discount from original and sale price?
Subtract the sale price from the original price to get the discount amount, then divide by the original price and multiply by 100. For example: ($200 - $170) ÷ $200 × 100 = 15% discount.
