Tip Calculator

Standard tipping etiquette in the US: 15–18% for adequate service, 20% for good service, 25%+ for exceptional service. In other countries, tipping customs vary — in Japan tips are generally not expected, while in the UK 10–15% is common.

Either is acceptable. Tipping on the pre-tax amount is technically more correct, but the difference is small. In practice most people tip on the final bill amount for simplicity.

For 20%: move the decimal one place left (10%), then double it. For 15%: find 10%, take half of that for 5%, then add them. For 18%: find 20% and subtract 10% of the 20% amount.