Free Percentage Calculator
Solve any everyday percentage problem in seconds — what is X% of Y, percentage increase or decrease, discounts, tips, and reverse percentages. Seven calculators in one, with the formula and a plain-English explanation shown for every answer. Free forever, no signup, everything runs in your browser.
What is X% of Y?
X is what percentage of Y?
Percentage increase
Percentage decrease
Discount calculator
Tip calculator
Reverse percentage — original price
Result
How to Use the Percentage Calculator
- Step 1: Pick the calculation you need from the tabs above (percent of, percent change, discount, tip, and more).
- Step 2: Type your numbers — results update instantly as you type, with the formula shown.
- Step 3: Copy the result with one click, or hit Reset to start over.
Why Use Our Percentage Calculator?
- 7 calculators in one: percent-of, percent change, increase, decrease, discount, tip, reverse percent
- Every answer shows the formula and a plain-English explanation
- One-click copy, reset, worked examples, and optional calculation history
- Free forever, no signup, private — nothing leaves your browser
Frequently Asked Questions
How do I calculate a percentage?
Divide the part by the whole, then multiply by 100. For example, 45 out of 180 is (45 ÷ 180) × 100 = 25%. To find X% of a number instead, multiply: 20% of 500 is (20 ÷ 100) × 500 = 100.
How do I calculate a discount?
Multiply the original price by the discount as a decimal to get the amount saved, then subtract. A $200 item at 15% off: $200 × 0.15 = $30 saved, so you pay $170. Our discount calculator does this instantly, with any currency symbol.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value, and multiply by 100. A price rising from $200 to $250: (250 − 200) ÷ 200 × 100 = 25% increase.
How do I find the original price after a discount?
Divide the final price by (1 − discount rate as a decimal). An $80 item after a 20% discount was originally $80 ÷ (1 − 0.20) = $80 ÷ 0.80 = $100. Use the Reverse Percentage tab above and it is done for you.