Percentage Calculator - Calculate Percentages Easily
Use our free percentage calculator to quickly calculate percentages, find a percentage of a number, and solve common percentage problems. The calculator works instantly on mobile phones, tablets, and computers.
What this tool does
This Percentage Calculator handles common percentage questions such as finding a percentage of a number, comparing a part with a whole, or measuring the percentage change between two values. Use the existing calculator controls above and read the result together with the labels shown for the selected calculation.
How percentage calculations work
A percentage means “out of one hundred.” For a basic percentage of a value, convert the rate to a decimal and multiply it by the value. For a comparison, divide the part by the whole and multiply by 100. Keep the units consistent and check whether the calculator is asking for a percentage, a part, a whole, or a change.
20% of 150 is 30, because 150 × 0.20 = 30. If a quantity rises from 50 to 60, the percentage increase is 20%.
Practical uses
Use it for discounts, grades, survey results, budgets, progress tracking, tax-free comparisons, and checking how much one quantity represents of another. For invoices or payments, confirm the currency, rounding, tax rules, and final terms independently.
Limits and privacy
This is a general arithmetic helper; it does not know local tax law, accounting policy, compound growth, or a platform-specific definition of percentage change. Rounding can produce a small difference from a receipt or spreadsheet. Values are processed in the browser for the calculation and are not intended to be stored as a personal or financial record.
What Is a Percentage?
A percentage is a way of expressing a number as a part of 100. The word "percent" means "per hundred." Percentages are commonly used in mathematics, finance, shopping, business, statistics, education, and everyday calculations.
For example, if you score 80 points out of 100, your score is 80 percent. Similarly, if a product costs $100 and has a 20% discount, the discount amount is $20.
Percentage Formula
To calculate a percentage of a number, multiply the percentage by the number and divide the result by 100.
How to Calculate a Percentage
Let's say you want to calculate 20% of 150.
Step 2: Divide the result by 100.
Calculation: 20 × 150 ÷ 100 = 30
Answer: 20% of 150 is 30.
Example: 15% of 200
15 × 200 ÷ 100 = 30
Therefore, 15% of 200 is 30.
Example: 25% of 80
25 × 80 ÷ 100 = 20
Therefore, 25% of 80 is 20.
When Can You Use a Percentage Calculator?
A percentage calculator can be useful in many everyday situations. You can use it when calculating discounts, exam scores, business percentages, tips, taxes, increases, decreases, and other common percentage calculations.
- Calculating discounts while shopping
- Calculating exam and test scores
- Calculating tips at restaurants
- Calculating business profits and margins
- Calculating percentage increases and decreases
- Understanding statistics and data
Frequently Asked Questions
What is 20% of 150?
20% of 150 is 30. You can calculate it by multiplying 20 × 150 and dividing the result by 100.
How do I calculate a percentage of a number?
Multiply the percentage by the number and divide the result by 100. For example, 10% of 200 is 10 × 200 ÷ 100 = 20.
Is this percentage calculator free?
Yes. The ToolMixo Percentage Calculator is free to use and does not require registration.
Can I use this calculator on my phone?
Yes. The calculator is designed to work on smartphones, tablets, laptops, and desktop computers.
Does ToolMixo store my calculations?
No. This calculator performs the calculation directly in your browser, so the numbers entered into the calculator are not sent to our server.