Percentage Calculator
Use our free online Percentage Calculator to perform fast, accurate calculations with instant formulas, step-by-step arithmetic, and verified reference benchmarks.
Multi-Mode Percentage Calculator
1. Calculate Percentage Value
2. Find Percentage Ratio
3. Percentage Increase / Decrease
How to Calculate: The Percentage Calculator Formula
Percentages represent fractions of 100. To find a percentage of a number, multiply the number by the percentage expressed as a decimal (e.g., 20% = 0.20).
Step-by-Step Calculation Guide
- Select your calculation mode (find percent of number, calculate percent change, or find base value).
- Input the primary number (part or starting value) and the reference number (whole or final value).
- For percent change: subtract initial value from final value, divide by initial value, and multiply by 100.
- The result updates automatically with step-by-step arithmetic.
Practical Percentage Calculator Examples
Finding the dollar discount on a $160 retail product with 25% off.
Calculating the percentage rise in stock price from $50 to $75.
Common Percentage to Fraction & Decimal Conversions
Official reference values and benchmark classifications based on standard institutional guidelines.
| Percentage | Decimal Equivalent | Fraction (Simplified) | Multiplication Factor |
|---|---|---|---|
| 5% | 0.05 | 1/20 | × 0.05 |
| 10% | 0.10 | 1/10 | × 0.10 |
| 20% | 0.20 | 1/5 | × 0.20 |
| 25% | 0.25 | 1/4 | × 0.25 |
| 33.33% | 0.3333 | 1/3 | × 0.3333 |
| 50% | 0.50 | 1/2 | × 0.50 |
| 75% | 0.75 | 3/4 | × 0.75 |
Frequently Asked Questions about Percentage Calculator
How do you calculate percentage increase?
Subtract the old value from the new value, divide the difference by the original old value, and multiply by 100.
What is the fastest way to calculate 15% tip in your head?
Find 10% of the total by moving the decimal point one spot to the left, take half of that 10% amount (which is 5%), and add them together.
How do you find the original price before a discount?
Divide the sale price by (1 minus the discount rate in decimal form). Example: $80 after 20% off = 80 / 0.80 = $100 original price.
What is percentage point difference vs percentage change?
Percentage points measure simple arithmetic difference (e.g., from 4% to 5% is a 1 percentage point rise), while percentage change measures relative change (a 25% increase).