Tip Calculators

TipLab guides

Plain-language answers to tip calculators questions, written from the same sourced data behind TipLab. Every guide lists its sources and the date it was last updated.

• Updated June 10, 2026

  How do you calculate a tip in your head?

  How to calculate a tip in your head using the move-the-decimal trick for 10%, 15%, 18%, and 20%, with worked examples on a real bill.