% Percentage Calculator

What is 15% of 20?

15% of 20 is 3. Use the calculator below to change either number, or see related calculations.

Enter values above to calculate.

Calculating 15% of 20: divide 15 by 100, then multiply by 20. The general formula is (X ÷ 100) × Y — works for any percentage and any number.

Percentages around this level appear in everyday calculations (interest rates, growth, splits). This base value sits in the everyday range — receipts, tips, small purchases.

How it works.

Formula: (X ÷ 100) × Y.

Step by step:

  1. Divide the percentage by 100: 15 ÷ 100 = 0.15.
  2. Multiply by the number: 0.15 × 20 = 3.
Worked examples
15% of 20 = 3 — the basic calculation: divide 15 by 100 (= 0.15), then multiply by 20.
15% of 20 as a tip on a small bill — if a service charge of 15% is added to a 20 item, the extra is 3.
15% off a 20-pound item — the discount saves 3; the sale price is £17.
Related: 14% of 20 16% of 20 15% of 10 15% of 25 X% of Y calculator

Frequently asked questions

How do I calculate 15% of 20?
Divide 15 by 100, then multiply by 20. 15 ÷ 100 = 0.15; 0.15 × 20 = 3. The same formula works for any pair of numbers.
What is 15 percent of 20?
3. The full calculation: (15 ÷ 100) × 20 = 0.15 × 20 = 3.
Does this percentage calculator round results?
Results display to 4 decimal places. Internally the maths is exact — rounding is for display only. Currency calculations on UK retail and tax sites typically round to 2 decimal places (pence). For technical or scientific use, copy the displayed 4-decimal result and round per your own convention.