What is 18% of 20?
18% of 20 is 3.6. Use the calculator below to change either number, or see related calculations.
Calculating 18% of 20: divide 18 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:
- Divide the percentage by 100: 18 ÷ 100 = 0.18.
- Multiply by the number: 0.18 × 20 = 3.6.
Worked examples
18% of 20 = 3.6 — the basic calculation: divide 18 by 100 (= 0.18), then multiply by 20.
18% of 20 as a tip on a small bill — if a service charge of 18% is added to a 20 item, the extra is 3.6.
18% off a 20-pound item — the discount saves 3.6; the sale price is £16.4.
Frequently asked questions
How do I calculate 18% of 20?
Divide 18 by 100, then multiply by 20. 18 ÷ 100 = 0.18; 0.18 × 20 = 3.6. The same formula works for any pair of numbers.
What is 18 percent of 20?
3.6. The full calculation: (18 ÷ 100) × 20 = 0.18 × 20 = 3.6.
What's the difference between a percentage and a percentage point?
A percentage measures a proportion of a whole. A percentage point measures the absolute difference between two percentages. If a tax rate moves from 5% to 7%, that's a 2 percentage point absolute change but a 40% relative increase. UK news often confuses the two when reporting Bank of England rate moves.