The check arrives, the table goes quiet, and everyone pretends to study the ceiling. Splitting a bill fairly — with tip — shouldn't require a group math degree. Here's everything you need: how to tip confidently, how to split painlessly, and how to settle the two classic restaurant arguments.

A restaurant receipt with coins and cards being split

Tipping, by the numbers

Tipping culture varies wildly — in the US, 15–20% at sit-down restaurants is standard practice; in Japan it can genuinely offend; in much of Europe it's a small rounding-up. Where it applies, the fastest mental method is the 10% + half trick:

• Bill is $84.60. 10% = $8.46. Half of that = $4.23.
• 15% tip = 8.46 + 4.23 ≈ $12.70
• 20% tip = 8.46 × 2 ≈ $16.90

Rules of thumb for the US:

• 20% — great service, or a large group (many restaurants auto-add 18–20% for 6+)
• 15–18% — standard service
• 10% — subpar but not offensive
• 0% — reserved for genuinely bad experiences, and worth explaining

How to split fairly

There are three levels of fairness, and the right one depends on the group:

1. Even split. Everyone pays total ÷ people. Best when meals were similar. A $212 bill among 5 people with 18% tip: (212 × 1.18) ÷ 5 = $50.04 each.

2. Per-item + shared tip. Each person pays for their own food; the tip is split evenly. Handles the salad-orderer-vs-steak-orderer gap.

3. Full itemization. Each person's items plus their share of shared dishes (apps, wine), plus tip pro-rata. Most precise, most spreadsheet. This is where a calculator saves ten minutes of napkin arithmetic.

The golden rule: agree on the method before the check lands. Ninety percent of bill-splitting resentment comes from method surprise, not from money.

Settling the two classic arguments

"Should the tip be on the pre-tax or post-tax amount?" Custom varies; tipping on the pre-tax subtotal is the defensible standard, and the difference is pennies per person. Don't let this one ruin friendships.

"How do we split when one person doesn't drink?" If the group ordered $120 of wine, the non-drinker shouldn't fund the cellar. Either separate the alcohol onto its own split, or — the smooth move — drinkers quietly absorb it. Per-item splitting with a shared-tip component handles it cleanly.

Venmo-era etiquette

• Round up, never down — the extra $0.60 buys peace.
• The organizer who books and fronts the money gets to pick the method; everyone else gets to be grateful.
• Never split a bill so that one person pays a larger share than their share of the meal "to be nice" — just tip better.

Skip the napkin math

For the percentage logic underneath tips, see Percentages Made Simple.