Percentage Calculator
Calculate percentages, percent change, and increases or decreases instantly.
15% of 200
30
How to use
- Choose a calculation type: percent of, what percent, percent change, increase, or decrease.
- Enter the two values for your calculation.
- See the result immediately — no button needed.
Formula
Percent of: Result = Value × (Percent ÷ 100).
What percent: Result = (Part ÷ Whole) × 100.
Percent change: Result = ((New − Old) ÷ Old) × 100.
Increase by %: Result = Value × (1 + Percent ÷ 100).
Decrease by %: Result = Value × (1 − Percent ÷ 100).
Example
What is 15% of 200?
15% of 200 = 200 × 0.15 = 30.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage divided by 100. For example, 20% of 150 = 150 × 0.20 = 30.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 25 is what percent of 200? (25 ÷ 200) × 100 = 12.5%.
What is percent change?
Percent change measures how much a value increased or decreased relative to the original. Formula: ((new value − old value) ÷ old value) × 100.
Can I use this for discounts?
Yes. Use the decrease mode to find a sale price. For example, a $80 item with 25% off: $80 decreased by 25% = $60.
How do I calculate a 20% discount?
Use decrease mode: enter the original price and 20 as the percent. Or use percent-of mode to find 20% of the price and subtract.
How do I calculate percent increase?
Use percent change mode with the original and new values, or increase mode to add a percentage to a number.