Calculate percentages, percentage increase/decrease, and find what percentage one number is of another.
This percentage calculator helps you quickly solve common percentage problems. Calculate what percentage one number is of another, find a percentage of a value, or determine percentage increase or decrease.
Perfect for shopping discounts, tax calculations, grade calculations, and financial planning. All calculations happen instantly in your browser.
Example 1: Finding 35% of 280
Using the "What is X% of Y?" calculator: Enter 35 in the first field and 280 in the second field. The result is 98. This means 35% of 280 equals 98.
Example 2: What percentage is 45 out of 180?
Using the "X is what % of Y?" calculator: Enter 45 and 180. The result is 25%. So 45 is 25% of 180.
Example 3: Calculating price increase from $120 to $156
Using the "% Increase/Decrease" calculator: Enter 120 as the old value and 156 as the new value. The result shows a 30% increase.
Shopping & Discounts: Calculate sale prices instantly. If an item costs $80 with 25% off, you save $20. Use the "What is X% of Y?" calculator to find the discount amount, then subtract from the original price.
Academic Grading: Determine what percentage you scored on a test. If you got 85 points out of 100 possible, that's (85 ÷ 100) × 100 = 85%.
Financial Planning: Calculate tax amounts, tip percentages, and investment returns. A 15% tip on a $60 meal is (15 ÷ 100) × 60 = $9.
Business Metrics: Track growth rates and performance. If revenue increased from $50,000 to $75,000, that's a 50% increase.
Finding a Percentage of a Number: The formula (Percentage ÷ 100) × Value works for any percentage calculation. To find 30% of 200: (30 ÷ 100) × 200 = 60.
Percentage of a Whole: The formula (Part ÷ Whole) × 100 expresses one number as a percentage of another. If 40 students passed out of 50 total, the pass rate is (40 ÷ 50) × 100 = 80%.
Percentage Change: The formula ((New - Old) ÷ Old) × 100 measures growth or decline. A price drop from $200 to $160 is a 20% decrease: ((160 - 200) ÷ 200) × 100 = -20%.
The calculator provides three common percentage formulas. For "What is X% of Y?", it multiplies the percentage by the value. For "X is what % of Y?", it divides the part by the whole and multiplies by 100. For percentage change, it calculates the difference between two values relative to the original.
All calculations are performed instantly when you click the Calculate button. Results are displayed with two decimal places for accuracy.
To calculate a percentage of a number, multiply the number by the percentage divided by 100. For example, to find 20% of 100, calculate (20 ÷ 100) × 100 = 20.
Divide the first number (the part) by the second number (the whole), then multiply by 100. For example, 25 is 25% of 100 because (25 ÷ 100) × 100 = 25.
Subtract the original value from the new value, divide by the original value, then multiply by 100. For example, going from 100 to 150 is a 50% increase because ((150 - 100) ÷ 100) × 100 = 50.
Percentage points measure absolute difference between two percentages. If an interest rate rises from 5% to 7%, that's a 2 percentage point increase, but a 40% relative increase ((7-5) ÷ 5 × 100).
Yes, this percentage calculator is completely free. No registration or signup is required. Just open the page and start calculating.
Absolutely. To calculate a discounted price, use the "What is X% of Y?" calculator to find the discount amount, then subtract it from the original price. For example, 20% off $100 means the discount is $20, so the final price is $80.
No. All calculations happen entirely in your browser. No data is sent to any server or stored anywhere.