Fast tipping math for the table
The mental shortcut, for when your phone is in your coat: 10% is the bill with the decimal moved one place left; double it for 20%. On an $84.50 bill, 10% is $8.45, so 20% is $16.90 — the calculator agrees, and also settles who owes what without anyone doing arithmetic against their will at a dinner table.
Quick etiquette baselines (US)
- Table service: 18–20% standard, more for exceptional service.
- Bars: $1–2 per drink or 20% on a tab.
- Delivery: 15–20% or a fair flat amount for small orders.
- Takeout: discretionary; ~10% is a kind norm for big or complex orders.
Frequently asked
How much should I tip?
In the US, 18–20% is the customary range for table service, with 20%+ for great service. Counter service is more discretionary. Other countries differ widely — in much of Europe and Asia, small rounding or no tip is normal.
Do I tip on the pre-tax or post-tax amount?
Convention says pre-tax, and either is acceptable — the difference is small. Enter whichever amount is on your bill; consistency matters more than the technicality.
How does splitting the bill work here?
The calculator adds the tip to the bill and divides the total evenly by the number of people, so everyone's share includes their part of the tip.
Should I tip on takeout?
It's discretionary — many people tip around 10% for takeout, more if the order was large or complicated. Delivery is different: tipping the driver (typically 15–20% or a fair flat amount) is standard.