Percentage Calculator
Free percentage calculator: find X% of a number, what percent X is of Y, percentage change and discounts — instant results in your browser.
- ✓ Runs in your browser — nothing uploaded
- ✓ No sign-up
- ✓ Free, no limits
This free percentage calculator handles the four percentage problems people actually search for: finding X% of a number, working out what percent one number is of another, measuring the percentage change between two values, and applying a discount to a price. Pick the calculation, type two numbers, and the result appears instantly as you type — no button, no waiting.
Worked example: to find 15% of 200, choose “X% of Y”, enter 15 and 200, and the answer 30 appears immediately. To check a sale price, switch to Discount, enter the original price and the discount percent, and you get both the final price and the amount saved. Percentage change works the same way for price rises, pay increases or statistics — and it correctly shows negative values for decreases.
The maths runs entirely in your browser: nothing you type is sent to a server, it works offline once loaded, and the same inputs always give the same answer. If you work with money, the related loan calculator below builds on the same ideas with interest and amortization schedules.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 200 is 200 × 15 ÷ 100 = 30. The calculator does this instantly when you pick “X% of Y”.
How do I work out a percentage increase or decrease?
Percentage change is (new − old) ÷ old × 100. Going from 100 to 125 is a 25% increase; going from 200 to 150 is a −25% change, i.e. a 25% decrease.
How do I calculate a discount price?
Choose the Discount mode, enter the original price and the discount percent. A 25% discount on 80 saves 20, so the final price is 60 — both numbers are shown.