Calculate Anything Instantly
Our free online calculator handles all your math needs - from basic arithmetic to percentages and scientific calculations. No apps to download, no registration required. Just open and calculate on any device.
Calculator Features
Basic Math
Add, subtract, multiply, divide
Percentages
Calculate % of any number
Square Root
Find square roots instantly
Powers
Calculate exponents
Fractions
Divide and multiply
Negative
Work with negative numbers
How to Calculate Percentages
Learn how to calculate percentages with our easy formulas:
Find X% of a number:
(X ÷ 100) × number = result
What percentage is X of total:
(X ÷ total) × 100 = percentage
Or simply use our percentage calculator for instant results!
Common Calculations
- Tip calculation - Calculate 15-20% tips at restaurants
- Discounts - Find sale prices quickly
- Interest rates - Calculate simple interest
- Tax - Add or subtract tax amounts
- Grade percentages - Calculate test scores
- Growth rates - Measure percentage changes
Pro Tip
To calculate a 20% tip: multiply the bill by 0.20 (or divide by 5). For a 15% tip, multiply by 0.15. Our calculator makes this super fast!
Why Use Our Calculator?
- Free forever - No subscription or payments
- No downloads - Works in your browser
- Mobile ready - Use on phone or tablet
- Instant results - No loading time
- Private - No data stored or tracked