Percentage Calculator.
Three modes — pick yours and get the result instantly.
Enter both values to see the result
10%
÷ 10
20%
÷ 5
25%
÷ 4
50%
÷ 2
What you can calculate.
This percentage calculator covers the three most common percentage problems people face in everyday life. Whether you're working out a sale price, tracking a business metric, scoring a test, or calculating a restaurant tip — one of the three modes handles it directly without needing to remember a formula.
Capabilities
What You Get
The three percentage questions people actually ask, each with its own mode so you never have to recall the formula.
Percent Of A Number
Work out a discount, a tip, or a share of a total directly.
Percentage Change
Measure growth or decline between two values, with the direction shown.
X Is What Percent Of Y
Turn a raw score or a part-of-total into a percentage.
No Formula Needed
Each mode is labelled in plain language rather than algebra.
Instant Results
Answers update as you type, with no submit step.
Runs Locally
Plain arithmetic in your browser — nothing sent anywhere.
Related tools.
More free browser-based utilities, connected by category and use case.
Tip & Bill Splitter
Enter the bill total, choose a tip percentage, and split across any number of people. Supports itemized splitting — assign specific items to specific people for a fair breakdown.
Mortgage & Loan Calculator
Enter loan amount, interest rate, and term to get monthly payment, total interest paid, and a full amortization schedule. Supports both fixed and variable rate modes.
Age Calculator
Enter a date of birth and get the exact age in years, months, days, hours, and minutes. Shows the next birthday countdown and the day of the week you were born.
FAQ
Percentage Calculator FAQ.
How do I calculate what is X% of Y?
Multiply Y by X and divide by 100. For example, 20% of 250 = (20 × 250) ÷ 100 = 50. The "What is X% of Y" mode does this automatically as you type.
How do I find what percentage X is of Y?
Divide X by Y and multiply by 100. For example, 50 is what % of 200? (50 ÷ 200) × 100 = 25%. Use the "X is what % of Y" mode for this.
How do I calculate percentage change?
Subtract the original value from the new value, divide by the original value, and multiply by 100. Formula: ((New − Old) ÷ |Old|) × 100. A positive result is an increase; negative is a decrease.
What is the quick mental maths trick for 10%?
To find 10% of any number, just move the decimal point one place to the left. For 350, 10% is 35. For 20%, double that: 70. For 5%, halve the 10% result: 17.5.
How do I calculate a discount?
Use the "What is X% of Y" mode. Enter the discount percentage as X and the original price as Y. Subtract the result from the original price to get the sale price.
What is the difference between percentage increase and absolute increase?
Absolute increase is the raw difference (e.g., £20 more). Percentage increase expresses that change relative to the starting value (e.g., 20% more). Percentage change is more useful for comparisons across different scales.
