How to calculate percentage increase?

To calculate an A% increase on a value B, use the formula: B × (1 + A/100). For example, to increase $100 by 20%, calculate 100 × 1.20 = $120.

How to calculate percentage decrease (reduction)?

To calculate an A% decrease on a value B, use the formula: B × (1 - A/100). For example, to reduce $100 by 20%, calculate 100 × 0.80 = $80.

How to calculate percentages quickly?

To calculate X% of a number, multiply the number by X then divide by 100. Tip: 20% is dividing by 5, 50% is dividing by 2.

Simulators

Percentage Calculator

Compute percentages, increases and discounts

Percentage

Total value

Result

30.00

200 × 15 ÷ 100 = 30

15% of 200

Formula

Result = (percentage ÷ 100) × base value

200 × 15 ÷ 100 = 30

15% means 15 parts for every 100 parts of 200.

Common percentages of 200

10%

20.00

15%

30.00

20%

40.00

25%

50.00

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Examples and real-life use cases

Calculate a discount on a product price (e.g., sales).
Find the percent change between two values (growth, weight).
Increase a salary or rent by a certain percentage.
Determine the share of a subset relative to a total.

FAQ

How to calculate percentage increase?: To calculate an A% increase on a value B, use the formula: B × (1 + A/100). For example, to increase $100 by 20%, calculate 100 × 1.20 = $120.
How to calculate percentage decrease (reduction)?: To calculate an A% decrease on a value B, use the formula: B × (1 - A/100). For example, to reduce $100 by 20%, calculate 100 × 0.80 = $80.
How do you calculate the percentage change between two numbers?: The formula for percentage change is: ((Final Value - Initial Value) / Initial Value) × 100. If the result is positive, it's an increase; if negative, it's a decrease.
How to calculate percentages quickly?: To calculate X% of a number, multiply the number by X then divide by 100. Tip: 20% is dividing by 5, 50% is dividing by 2.