Percentage Calculator
Calculate percentages three different ways.
What is % of ?
is what % of ?
Percentage change from to
How to Use the Percentage Calculator
- Calculator 1 — Enter a percentage and a number to find that percentage of the number (e.g., 15% of 200 = 30).
- Calculator 2 — Enter two numbers to find what percentage the first is of the second (e.g., 30 is 15% of 200).
- Calculator 3 — Enter a starting and ending value to find the percentage change (increase or decrease).
- Click Calculate — each section has its own calculate button. The answer appears instantly below.
Frequently Asked Questions
How do I calculate a percentage of a number? ▼
To find X% of Y, multiply Y by X then divide by 100. For example, 15% of 200 = 200 × 15 / 100 = 30. Use Calculator 1 above — just enter 15 and 200, then click Calculate.
How do I find what percentage one number is of another? ▼
Divide the part by the whole and multiply by 100. For example: 30 is what percent of 200? → 30 / 200 × 100 = 15%. Use Calculator 2 above for this.
How do I calculate percentage increase? ▼
Percentage increase = ((New Value − Old Value) / |Old Value|) × 100. For example, from 100 to 150 is a 50% increase. Use Calculator 3 above — enter 100 and 150 to get +50%.
How do I calculate a discount? ▼
To find the sale price: Sale Price = Original Price × (1 − Discount% / 100). For a 20% discount on a £80 item: £80 × (1 − 0.20) = £64. Alternatively, use Calculator 1 to find 20% of 80, then subtract from 80.
What is the difference between percentage point and percent change? ▼
A percentage point is the arithmetic difference between two percentages — going from 10% to 15% is +5 percentage points. Percent change is relative — 10% to 15% is a 50% increase (5/10 × 100). These are often confused in news reporting.