Percentage Calculator

Calculator 1: What is X% of Y?

This calculator answers questions like "What is 25% of 200?" Simply enter the percentage in the first field and the number in the second field, then click Calculate. This is perfect for calculating discounts, tips, sales tax, or any situation where you need to find a percentage of a whole number.

Example: To find 15% of 80, enter 15 in the percentage field and 80 in the number field. The result is 12.

Calculator 2: X is What % of Y?

Use this when you know two numbers and want to find out what percentage one is of the other. For instance, "50 is what percent of 200?" This is useful for calculating test scores, completion rates, or comparing values.

Example: If you scored 42 out of 50 on a test, enter 42 as the part and 50 as the whole. The result shows you scored 84%.

Calculator 3: Percentage Change

Calculate the percentage increase or decrease between two values. Enter your original value and new value to see the percentage change. This calculator is ideal for tracking price changes, salary increases, weight loss/gain, or investment returns.

Example: If a stock price went from $100 to $125, enter 100 as original and 125 as new. The result shows a 25% increase.

Calculator 4: Increase/Decrease by X%

Want to know what a number becomes after increasing or decreasing it by a percentage? This calculator does exactly that. Enter your starting number and the percentage change (use negative numbers for decreases).

Example: To find the final price after a 20% discount on $50, enter 50 as the starting number and -20 as the percentage. The result is $40.

How do you calculate a percentage?

To calculate a percentage, divide the part by the whole and multiply by 100. For example, to find what percentage 25 is of 100: (25 ÷ 100) × 100 = 25%. Our calculator does this instantly for you.

How do you calculate percentage increase?

Percentage increase = ((New Value - Original Value) ÷ Original Value) × 100. For instance, if something increased from 50 to 75: ((75 - 50) ÷ 50) × 100 = 50% increase.

How do you calculate percentage decrease?

Percentage decrease = ((Original Value - New Value) ÷ Original Value) × 100. For example, if a price dropped from 100 to 80: ((100 - 80) ÷ 100) × 100 = 20% decrease.

What is 20% of 100?

20% of 100 is 20. To calculate this manually: (20 ÷ 100) × 100 = 20. Use our first calculator to find any percentage of any number instantly.

How do you add a percentage to a number?

To add a percentage to a number, multiply the number by (1 + percentage/100). For example, to add 10% to 50: 50 × (1 + 10/100) = 50 × 1.10 = 55. Our fourth calculator makes this easy.

How do you calculate tip percentage?

To calculate a tip, use our first calculator. For a 20% tip on a $50 bill, enter 20 as the percentage and 50 as the number. The result is $10 (your tip amount).

Shopping & Discounts

Calculate sale prices, coupon savings, and total discounts. If a $200 jacket is 30% off, use our calculator to find you'll save $60 and pay $140. Perfect for Black Friday shopping or comparing deals across stores.

Restaurant Tips

Quickly calculate 15%, 18%, or 20% tips on your restaurant bills. For a $85 dinner with 20% tip, our calculator shows you should tip $17 for a total of $102.

Grade Calculations

Students and teachers can convert scores to percentages. If you got 47 out of 60 questions correct, our calculator shows that's 78.33%. Also useful for calculating what grade you need on a final exam.

Salary & Raises

Calculate salary increases or compare job offers. A 5% raise on a $60,000 salary means an extra $3,000 annually, bringing your new salary to $63,000.

Finance & Investments

Track investment returns, calculate interest rates, or measure portfolio performance. If your investment grew from $10,000 to $12,500, that's a 25% return.

Health & Fitness

Monitor weight loss progress, calculate body fat percentage changes, or track workout improvements. If you lost 15 pounds from a starting weight of 200 pounds, that's a 7.5% decrease.

Sales Tax

Calculate the total cost including sales tax. With an 8% sales tax on a $250 purchase, you'll pay an additional $20 in tax for a total of $270.

✓ Four Calculators in One

No need to search for different calculators. We provide all the percentage calculations you need in one convenient location.

✓ Mobile-Friendly Design

Calculate percentages on any device. Our responsive design works perfectly on phones, tablets, and desktop computers.

✓ Accessible & Easy to Read

High-contrast colors and large, clear text make our calculator easy to use for everyone, including those with visual challenges.

✓ Completely Free

No registration, no downloads, no fees. Just open and calculate. All processing happens in your browser for complete privacy.

✓ Instant Results

Get your answers immediately. No waiting, no loading screens. Enter your numbers and click calculate for instant, accurate results.

✓ Privacy-Focused

Your calculations are never stored or transmitted. All processing happens locally in your browser, ensuring your data stays private and secure.