How to Calculate a Tip (and Split the Bill Fairly)

Tipping is one of those social conventions that everyone practices and almost nobody thinks through clearly. This post covers the standard rates, the math for splitting the bill (including the awkward uneven cases), the difference between pre-tax and post-tax tipping, and how to do the whole thing in your browser without an app or a back-of-the-napkin argument.

Standard tipping rates by country

Tipping customs vary dramatically by country, and getting them wrong is at best an overpayment and at worst a social misstep. The rough norms:

• United States: 18-22% for sit-down service, 15% for mediocre, 25%+ for excellent. 10-15% for buffet or counter service. $1-2 per drink at the bar. Tip on the pre-tax subtotal, not on the post-tax total (see below).
• Canada: Same as the US in practice. 18-20% is standard.
• United Kingdom: 10-15% for good service if a service charge is not already on the bill. Many restaurants add a discretionary 12.5% service charge; check the bill before tipping on top of it.
• France, Italy, Spain, most of the EU: Service is included (service compris / coperto). No further tip expected. Rounding up the bill or leaving small change for exceptional service is fine but not required.
• Japan: No tipping. It is often considered rude. The service quality is the price you paid for.
• Australia, New Zealand: Tipping is not expected, but 10% for excellent service is appreciated.
• China: Tipping is not traditional. In tourist-facing restaurants, 10% is sometimes expected but not always welcome.
• Middle East (UAE, Saudi, etc.): 10-15% is often added as a service charge. Check the bill.
• Latin America: 10% is often sufficient in tourist areas; locals often tip less. Check the bill for a service charge.

The Currency Converter is useful here if you are calculating a tip in a currency that is not your home currency. A 20% tip on a 1,200 peso meal is a 240 peso question, not a USD question, even if the bill is going on a USD card.

The pre-tax vs. post-tax question

In the US, the standard practice is to tip on the pre-tax subtotal, not on the post-tax total. The argument is that the tip is for service, and the tax is not part of the service — it is a pass-through to the government. The math:

• Subtotal: $80. Sales tax (8%): $6.40. Total: $86.40.
• 20% on pre-tax: $16.00 tip. Total with tip: $102.40.
• 20% on post-tax: $17.28 tip. Total with tip: $103.68.

The difference is small on a small bill, but on a $200 dinner it is $2.56 per 20% tip. Over a year of dinners, that adds up. Most restaurant workers prefer the pre-tax method; the IRS and most state labor boards also use pre-tax for tip-credit calculations.

The Tip Calculator on this site defaults to pre-tax. Most good tip calculators do, because that is the standard convention. The post-tax option is there for the cases where you have been tipping that way and do not want to switch.

Even split: the trivial case

Four people, $80 bill, 20% tip, even split. The math:

1. Subtotal: $80.
2. Tax: $6.40 (assuming 8%).
3. Tip (20% of subtotal): $16.
4. Total: $80 + $6.40 + $16 = $102.40.
5. Per person: $102.40 / 4 = $25.60.

This is straightforward enough to do on a phone calculator. The complication comes when the order is uneven.

Uneven split: the realistic case

Four people at dinner. Person A had a $40 steak, person B had a $30 pasta, person C had a $20 salad, person D had a $25 fish. Tax: 8%. Tip: 20%. How much does each person pay?

1. Subtotals: A $40, B $30, C $20, D $25. Total: $115.
2. Tax: $9.20 total. Allocate proportionally: A pays $3.20, B pays $2.40, C pays $1.60, D pays $2.00.
3. Tip (20% of each subtotal): A pays $8.00, B pays $6.00, C pays $4.00, D pays $5.00.
4. Each person's total: A $51.20, B $38.40, C $25.60, D $32.00.
5. Sum check: $51.20 + $38.40 + $25.60 + $32.00 = $147.20, which matches the bill total ($115 + $9.20 + $23.00).

The math is not hard, but it is fiddly enough to be error-prone on a phone while a waiter is waiting. The Tip Calculator handles this case directly: enter the number of people, enter each person's subtotal (or "even" for some and a custom amount for others), and the result is each person's total including their share of tax and tip.

When the tip is included (service charge)

Many restaurants add a service charge for larger parties (6+ in the US, often 4+ in the UK and EU). The bill will show the service charge as a line item. In that case:

• Do not add an additional tip on top of the service charge. The service charge is the tip; adding more is over-tipping.
• If the service was exceptional, an extra $5-10 per person (or 5% of the bill) is a kind gesture but not expected.
• If the service was poor and the bill has a service charge, ask to speak to the manager. The service charge is usually negotiable in case of genuinely bad service, though many restaurants will not adjust it.

The tip calculator can handle this too: enter the service charge as a "tip" and the calculator will show zero additional tip. If you want to add a small extra, enter it as a custom tip amount.

Tipping for takeout, delivery, and counter service

The convention is shifting here, but the rough norms in the US:

• Counter service (coffee, bagel, fast casual): $1-2 or 10-15%, rounded up. Not expected but appreciated.
• Takeout: 10% is kind, but not expected. The kitchen staff did the work, but they are usually paid hourly rather than tipped.
• Delivery: $3-5 base plus 10-15% of the order. The base covers the driver's time and gas; the percentage covers the service. In bad weather, double the base.
• Food trucks: No tip expected, but $1-2 is appreciated.

Outside the US, takeout and delivery tipping is much less common, and the percentage when it exists is much lower.

How to do the whole thing in your browser

The Tip Calculator does the full split in one place:

1. Enter the subtotal and the tax. If the bill shows the total but not the tax separately, enter the tax rate and the calculator back-computes the subtotal.
2. Choose a tip percentage (or enter a custom one).
3. Choose the split: even, by number of items per person, or by custom amounts.
4. Read each person's total. Round to a sensible number (the calculator can do this too).

The whole calculation runs in the browser. The bill, the tax, the tip percentage, and the per-person amounts are entered in the page, the math runs in JavaScript, and the result is rendered. Nothing is sent to a remote service, nothing is logged, and nothing is stored. If you are calculating a tip on a business dinner or a sensitive number, the privacy matters.

A short etiquette checklist for splitting

1. Decide the split method before the bill arrives. "Even split" is the easiest; "by what each person ordered" is the fairest; "the birthday person does not pay" is sometimes appropriate. Settling this at the table while the waiter waits is the awkward part.
2. Confirm whether a service charge is already on the bill before adding a tip.
3. Tip on the pre-tax subtotal unless the convention where you are is different.
4. Pay the tip on a card (the restaurant gets it safely and can allocate it) or in cash (the server gets it immediately). Both are fine; in the US, servers usually prefer cash because they can take it home that night.
5. If you are splitting on multiple cards, ask the restaurant if they can run them as separate transactions. Many can, but some will only split the bill evenly. The answer determines whether you need to do the per-person math at all.

That is the whole job. The math is the same math the bank or the restaurant's POS does. The browser calculator is faster and keeps the numbers on your device.