Use this Percentage Calculator to quickly compute percent values, find what percent one number is of another, or calculate percentage increase or decrease. Fast, accurate, and ideal for finance, discounts, or data analysis.
The Percentage Calculator solves the two most common percentage problems: finding what percent one number is of another, and calculating a specific percentage of a given number. It's used every day for discounts, tips, grades, taxes, markups, and financial analysis.
Percentage of a number: Part = (Percentage ÷ 100) × Base What percent of base: Percentage = (Part ÷ Base) × 100
A common source of confusion: if an interest rate rises from 3% to 5%, it increased by 2 percentage points (an absolute change) — but the relative percentage increase is (5 − 3) ÷ 3 × 100 = 66.7%. Percentage points describe a change in a rate itself; percent change describes how large that change is relative to the starting value. For tracking change between two values over time, use the Percentage Change Calculator.
If you know the price after a discount but need the original, divide by (1 − discount rate):
Original = Sale Price ÷ (1 − Discount Rate) Example: $80 after 20% off → $80 ÷ 0.80 = $100 original price
For a markup: divide by (1 + markup rate). Example: $130 after a 30% markup → $130 ÷ 1.30 = $100 cost. To compare two values symmetrically, see the Difference Calculator.
Multiply the base by the percentage, then divide by 100. Formula: Part = (Percentage ÷ 100) × Base. Example: 25% of 200 = (25 ÷ 100) × 200 = 50.
Divide the part by the base, then multiply by 100. Formula: Percentage = (Part ÷ Base) × 100. Example: 50 is what percent of 200? → (50 ÷ 200) × 100 = 25%.
Multiply the bill by the tip percentage divided by 100. For a 20% tip on a $75 bill: (20 ÷ 100) × 75 = $15. Use the 'Find a Percentage of a Number' section above.
Percentage points measure an absolute difference between two percentages. If an interest rate rises from 3% to 5%, that's 2 percentage points — but a 66.7% relative increase. Percentage change measures the relative shift.
Divide the discounted price by (1 − discount rate). Example: an item costs $80 after a 20% discount. Original price = $80 ÷ 0.80 = $100. This is called a reverse percentage.
100% of any number equals the number itself. 200% is double the value; 50% is half. For example, 150% of 60 = 90.
Yes. It supports decimal percentages (e.g., 7.5%) and negative values for all operations.
Percentages appear in finance (interest rates, investment returns), retail (discounts, markups, tax), education (grades, test scores), nutrition labels, statistics, and everyday tasks like tipping or splitting bills.