Tipping conventions
In the US, 15–20% is standard for sit-down service, with 20%+ for excellent service. Many other countries expect less or include service automatically — check local norms when traveling.
Tip and total per person for any bill — split evenly among any group size.
tip = bill × percent · per-person share = (bill + tip) ÷ people
$85 bill, 18% tip → $15.30 tip, $100.30 total; split four ways = $25.08 each.
In the US, 15–20% is standard for sit-down service, with 20%+ for excellent service. Many other countries expect less or include service automatically — check local norms when traveling.
Etiquette guides say tip on the pre-tax subtotal; in practice most people tip on the full amount for simplicity.
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