How the tip is calculated
Tip = bill × tip % ÷ 100 and total = bill + tip. When you split the bill, the total is divided evenly: each share = total ÷ number of people. With rounding on, each share is rounded up to a whole dollar and the tip grows by the difference.
In plain English: turn the percentage into a decimal (20% becomes 0.20), multiply it by the bill, and add the result back on. Splitting comes last, so everyone pays the same share of both the food and the tip.
Worked example: three friends, an $86.40 check
Three people share a dinner that comes to $86.40 before the tip. Here is what the calculator gives at two common rates:
- 20% tip: $86.40 × 0.20 = $17.28. Total $103.68, so $34.56 each.
- 18% tip: $86.40 × 0.18 = $15.55. Total $101.95, so $33.98 each.
- 20% with “round up each share” on: $34.56 rounds up to $35.00 each. The group pays $105.00, so the tip becomes $18.60 — about 21.5% of the bill.
Rounding up costs each person well under a dollar here, but it makes cash and payment-app splits much easier and the server gets a slightly better tip.
Mental-math shortcuts
- 10%: move the decimal one place left. $86.40 → $8.64.
- 20%: double the 10% figure. $8.64 × 2 = $17.28.
- 15%: 10% plus half of it. $8.64 + $4.32 = $12.96.
- 25%: divide the bill by four. $86.40 ÷ 4 = $21.60.
A quick tipping guide
These are common US customs, not rules — tipping is always your choice, and norms differ by region and venue.
- Sit-down restaurants: 15–20%, often 18–20% for good service.
- Bars: $1–2 per drink, or 15–20% of the tab.
- Food delivery: 15–20%, with a few dollars minimum on small orders.
- Hair and beauty: 15–20% of the service price.
- Counter service: optional; many people leave 10% or round up.
Tipping customs vary by country and change over time — when traveling, check local norms.
Why tips matter to the person serving you
Under the federal Fair Labor Standards Act, an employer can pay a tipped employee a direct cash wage of just $2.13 an hour and count tips toward the rest of the $7.25 federal minimum wage. If tips fall short, the employer must make up the difference. Many states set a higher tipped wage, and some require the full state minimum wage before tips. Either way, the tip is often a large share of a server's take-home pay, which is why US tipping norms are higher than in many other countries.
Common mistakes
- Tipping on a discounted total. If you used a coupon or gift card, the service was the same — many people tip on the original, pre-discount price.
- Double tipping. Large-party bills often include an automatic gratuity. Read the receipt before adding a tip on top.
- Splitting before tipping. If each person rounds their own share of the food and then tips separately, the totals rarely add up. Work out the tip on the whole bill first, then split.
- Misreading the tip screen. Card terminals sometimes calculate suggested percentages on the after-tax total. Check the dollar amount, not just the percentage button.
Practical tips
- Decide the rate before the check arrives. Agreeing on 18% or 20% as a group avoids awkward math at the table and makes the split fair.
- Small checks deserve a floor. 20% of a $9 breakfast is $1.80; many people leave at least $2–3 because the server's work is similar to a larger order.
- Use round-up for cash. Rounding each share to a whole dollar means nobody needs coins, and the calculator shows exactly how much the tip rose.
- Keep an eye on budget. Tips on regular dining and delivery add up over a month. Adding them to your food budget gives you a truer picture of what eating out costs.
When an even split doesn't fit
The calculator divides the bill equally. If one person ordered a steak and another a salad, an even split may feel unfair — work out each person's items separately, then apply the same tip percentage to each subtotal. It also doesn't handle a service charge already on the bill or sales tax rules; enter the exact amount you want to tip on.
Related calculators
For any other “what is X% of Y” question, use the percentage calculator. If you work for tips and want to see what an hourly wage adds up to over a year, try the salary to hourly calculator, and the paycheck calculator estimates take-home pay after taxes.