Tip Calculator

A tip calculator turns a bill, a tip percentage and a party size into the three numbers the table needs: tip amount, grand total, and each person's share. $86.40 at 18% split four ways → $15.55 tip, $101.95 total, $25.49 each — solved before the check holder finishes squinting.

The percentage conventions it encodes (US): 15% baseline, 18% standard, 20% for good service — with counter service and pickup in the discretionary 0–10% zone. The math itself is percentage arithmetic; the value is speed and the bill-split, which humans reliably fumble after dinner.

Enter the bill, pick a tip percentage, set how many people are splitting, and every number updates live — adjust the tip up or down and watch the per-person figure follow.

Decisions it settles instantly: pre-tax or post-tax tipping (custom says the pre-tax amount is fair; most people tip on the total for simplicity — on a 8% tax the difference at 20% tip is small), whether to round the total to a clean number (enter the rounded total mentally and see the implied percentage), and the awkward uneven-split — the per-person amount is the same for everyone, which is the tradeoff of the simple split; itemized splitting is a different sport.

Abroad-context worth carrying: tipping norms vary hard — 10% or service-included across much of Europe (check the bill for "service compris"), no tipping in Japan and South Korea, round-up culture elsewhere. The calculator's percentage box adapts to any local custom.