Tip Calculator

Enter a bill and tip percentage to get the tip amount and total, split that total evenly across a group, or work backward from a combined total to find the original pre-tip bill.

For personal planning and general reference — verify important results when needed.

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Enter your bill amount and tip percentage, then click Calculate to see the tip amount, total, and step-by-step solution.

The basic tip calculation

A tip is just a percentage of the bill, added on top of it — the only real decision is which number the percentage applies to.

Tip = Bill × (Tip % ÷ 100)

Total = Bill + Tip

$85.00 bill at 18%: Tip = $15.30, Total = $100.30

Many diners tip on the pre-tax subtotal rather than the post-tax total, since the tax itself isn't service the server provided — but tipping on the full total is common too, and the gap between the two approaches is usually just a dollar or two either way.

Splitting a bill among a group

Total per person = (Bill + Tip) ÷ Number of people

$120 bill, 18% tip, 4 people: ($120 + $21.60) ÷ 4 = $35.40 each

That works cleanly when everyone ordered roughly the same amount. When one person's order was noticeably more expensive than the rest, an even split quietly overcharges the light eaters and undercharges the big spender — splitting by each person's own subtotal, tip included, is the fairer version of the same math.

Working backward from a combined total

Sometimes the only number available is a single combined total — a card statement, a shared receipt, an expense report — and the original bill needs to be reconstructed. That's division instead of multiplication:

Original bill = Total ÷ (1 + Tip % ÷ 100)

$100.30 total at 18% tip: $100.30 ÷ 1.18 = $85.00

This only works if the tip percentage that was actually applied is known — if it isn't, the reverse calculation can only estimate based on a guessed percentage.

Tipping norms aren't universal

15-20% for US sit-down restaurant service is a widely cited range, but it's a US-specific custom, not a global rule. Plenty of countries build a service charge directly into the menu price or the bill, treat a small rounding-up as sufficient, or don't have a tipping culture at that percentage at all. Checking local norms before traveling avoids both under-tipping, which can read as an insult in some places, and over-tipping somewhere a service charge is already included.

General percentage math

For percentage calculations beyond tipping — markups, discounts, percentage change between two numbers — the percentage calculator covers the general case.

Frequently Asked Questions

How much should I tip at a restaurant in the US?

Customary restaurant tips are often 15–20% of the pre-tax bill for sit-down service. Higher percentages may apply for exceptional service or large parties.

Should tip be calculated on tax?

Many people tip on the pre-tax subtotal. Tipping on post-tax total is also common — choose one approach and stay consistent.

How do I split a bill and tip among friends?

Add tip to the total, then divide by number of people. Or calculate tip per person from individual shares if orders differ significantly.

Do tipping norms differ by country?

Yes. Some countries include service charge in the bill; others expect 10% or no tip. Local custom matters when traveling.

How do I use this tip calculator?

Enter bill amount, tip percentage, and number of people, then click Calculate. Tip amount, grand total, and per-person share appear in the results.

How does the reverse tip calculation work?

If a receipt only shows one combined total that already includes the tip, divide that total by (1 + tip percentage as a decimal) to recover the original bill. A $100.30 total at an 18% tip works out to a $85.00 original bill, since 85 times 1.18 equals 100.30.

Is it fairer to split the bill evenly or by what each person ordered?

Splitting evenly is simplest and works fine when orders are roughly similar in price. When one person ordered a lot more (or a lot less) than everyone else, calculating each individual subtotal and applying the tip percentage to each share separately is the fairer approach, even though it takes a little more arithmetic.

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