This free online percentage calculator gives you instant answers the moment you type — no button to press, no page to reload, no sign-up required. It works on all devices including mobile, tablet, and desktop.
Whether you are calculating a discount at a store, working out your exam percentage, tracking a salary hike, or figuring out how much a price has changed — our tool covers the most common percentage calculations people search for every day.
How to Use This Percentage Calculator
Tab 1 — Find X% of a number: Enter the percentage and the number. Instantly get the result. Perfect for calculating discounts, tips, tax amounts, and commissions.
Tab 2 — What percent is X of Y? Enter two numbers and find what percentage one is of the other. Useful for exam scores, test results, and proportions.
Tab 3 — Percentage increase or decrease: Enter a starting value and an ending value to find how much something has changed. Used for price changes, salary increases, population growth, and investment returns.
Percentage Formulas
Formula 1 — X% of Y: Answer = (X ÷ 100) × Y. Example: 15% of 200 = (15 ÷ 100) × 200 = 30.
Formula 2 — What percent is X of Y: Answer = (X ÷ Y) × 100. Example: 30 is what percent of 200? = (30 ÷ 200) × 100 = 15%.
Multiply the number by the percentage and divide by 100. For example, 30% of 250 = (250 × 30) ÷ 100 = 75. Use the first tab above — it calculates the answer as you type, instantly.
Divide the part by the total and multiply by 100. For example: 40 out of 160 → (40 ÷ 160) × 100 = 25%. Use the second tab for instant results without doing the math yourself.
Use this formula: ((New Value − Old Value) ÷ Old Value) × 100. A positive result means an increase; a negative result means a decrease. For example: price from $500 to $650 → ((650−500) ÷ 500) × 100 = 30% increase. Use the third tab above.
To find the discount amount: use Tab 1 and enter the discount percentage and the original price. For example, 20% off $150 = 20% of 150 = $30 off. Final price = $150 − $30 = $120. Alternatively, enter the original and sale price in Tab 3 to see the percentage saved.
Use Tab 2: enter your marks obtained and total marks. For example, you scored 450 out of 500 — enter 450 in the first box and 500 in the second. The result is 90%, which is your percentage.
The basic percentage formula is: Percentage = (Part ÷ Whole) × 100. To find a percentage of a number: Result = (Percentage ÷ 100) × Number. To find percentage change: Change% = ((New − Old) ÷ Old) × 100. Our calculator applies these formulas automatically.
Yes — completely free forever. No account, no sign-up, no hidden charges. Works on mobile, tablet, and desktop. The site is supported by advertising so the tool can remain free for everyone.