How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 20% of 80 is (20 × 80) ÷ 100 = 16.

Is this calculator free?

Yes, completely free with no sign-up required.

Percent (X)

Number (Y)

Result

20% of 200 = 40

Value (X)

Total (Y)

Result

50 is 25% of 200

Original Value

New Value

Change

50% increase

Choose the type of calculation you need (percent of a number, percent of total, or percent change).
Enter your numbers — results update instantly.
Use the result for shopping discounts, tip calculations, grade calculations, or business analytics.

Subtract the original value from the new value, divide by the original value, then multiply by 100. Our calculator does this instantly.

Multiply the number by the percentage value (divided by 100). For example, 15% of 200 = 200 × 0.15 = 30.

Yes, it uses standard mathematical percentage formulas and supports decimal precision for accurate results.