Tip Calculator

The math is easy; the norms are the hard part

The arithmetic behind this page is one line — tip equals bill times percent — and a $60 dinner at 18% splits between two people as $10.80 of tip, a $70.80 total, and $35.40 each. What actually confuses people at the table is never the multiplication; it is knowing which percentage applies, what base to apply it to, and when the answer is “none at all”. Those are cultural questions with reasonably stable answers, and they are worth knowing cold because you make this decision hundreds of times a year.

Why US tipping works this way

American table-service tipping is not a courtesy layered on a full wage — it usually isthe wage. Federal law lets restaurants pay tipped employees a cash wage as low as $2.13 an hour provided tips bring them to the standard minimum; most states are less extreme, but in much of the country the tip line is the majority of a server’s income. That is the context behind the firm 18–20% norm for sit-down service, and why skipping the tip after acceptable service reads as taking the meal at the server’s expense. It is also why norms are so much weaker where staff earn full wages — counter service, takeout — and why the same percentage exported to Tokyo or Seoul, where hospitality wages are simply wages, lands somewhere between confusing and rude.

The base questions, settled

• Pre-tax or post-tax? Etiquette says the pre-tax subtotal is fine; most people tip on the total because it is the number staring at them. The stakes are small — on a $60 bill with 8% tax, 20% of the tax is only 96 cents — so pick a habit and stop re-litigating it at the table.
• Discounted bill?Tip on the original amount. The coupon reduced the restaurant’s revenue, not the server’s work.
• Service charge on the bill? That replaces the tip — common for large parties and increasingly on all checks in some cities. Adding 20% on top of an 18% autograt is a genuine double payment; check the bill before the math.
• Bad service?Adjust within the system: 15% signals disappointment while acknowledging the wage reality; zero is reserved for genuinely hostile service, ideally alongside a word to the manager, since kitchen failures are not the server’s doing.

Splitting without the awkward ten minutes

The classic end-of-dinner stall — receipts, phone calculators, someone “only had a salad” — has two clean solutions. The first is the even split this calculator does by default, which is fair whenever everyone ate roughly comparably. The second is the round-up toggle: take a $73.50 bill at 20% among three people, and instead of $29.40 each, everyone pays a flat $30. The extra $1.80 flows to the server (an effective tip of 22.4%, which the calculator reports honestly), and the table is settled in one sentence. Rounding up is almost always worth the pennies: the transaction cost of exact change — in time and goodwill — exceeds the money. For genuinely uneven meals, split the itemized bill first and apply the same percentage to each share; the percentage calculator handles any odd case the presets don’t.

Tipping fatigue is real — the norms haven’t moved

Checkout tablets now request 25% for handing over a muffin, and Pew’s research finds most Americans say tipping is expected in more places than five years ago. It helps to separate the two things happening: the prompts have spread to transactions that were never tipped, while the norms— 18–20% for table service, a few dollars for deliveries and hotel housekeeping, optional generosity at counters — are basically unchanged. The suggested buttons are defaults chosen by software, not etiquette rulings. Decide your own baseline for each situation once, use the custom percent field for it, and the screen’s opinion stops mattering.