Percentage Calculator

Calculate percentages with 8 different modes. Find what percent, percentage change, increase, decrease, and more with step-by-step solutions.

Result

What is 20% of 100?

20

Step-by-step

Formula: (Percent / 100) × Total
Step: (20 / 100) × 100 = 0.2 × 100 = 20
Final Result: 20

Common shortcuts

Try 50%, 25%, or 10% in "What is X% of Y?" for quick estimates.

50%

50% of 80 = 40

25%

25% of 80 = 20

10%

10% of 80 = 8

Common formulas

Amount

(Percent / 100) × Total

Percent

(Part / Total) × 100

Percent change

((New − Old) / Old) × 100

Percent pts

New % − Old %

What is a percent?

"Percent" comes from per centum (by the hundred). 20% means 20 per 100.

Calculation Complete

A percentage calculator handles all common percentage operations — finding what percent one number is of another, calculating percentage increase/decrease, and converting between fractions, decimals, and percentages.

Select one of the 8 modes from the dropdown (e.g. "What is X% of Y?", "X is what % of Y?", percentage change, increase, decrease, or percentage points). Enter the values asked for—typically a percent (X) and a total or whole (Y)—in the fields. Click Calculate to see the answer and a step-by-step explanation of the calculation.

Examples

What is 25% of 80?

25/100 × 80 = 0.25 × 80 = 20

Percentage change from 50 to 75

((75 - 50) / 50) × 100 = 50% increase

Frequently Asked Questions

What is the difference between percentage change and percentage points?
Percentage change is relative (40% to 60% = 50% increase), while percentage points is absolute (40% to 60% = 20 percentage points).
Related Calculators
Fraction Calculator
Ratio Calculator
Discount Calculator
Tip Calculator

Quick Tips

  • •Double-check your inputs — small errors in numbers lead to large errors in results.
  • •Use percentage points when comparing rates side by side and percentage change when measuring growth over time.
  • •Convert fractions to decimals first if you are unsure which percentage mode to use.