Tip Calculator

What Is a Tip?

Everything on a restaurant check has a fixed price except this one line, and the rules that govern it are conventions rather than law. Knowing which figure the percentage attaches to, and which charges on the bill are not tips at all, is most of what separates paying correctly from paying twice.

The concept, plainly

A tip is a discretionary payment for service, added on top of a price that was already agreed. Nothing about it is enforceable — the menu price is what you owe, and the tip is what you choose to add. That single fact is also the legal test. The IRS states it in one sentence: a payment is a tip only if the customer voluntarily decides to pay it and determines the amount. Anything the business fixes and requires is, in tax terms, not a tip.

In American full-service restaurants the tip is expressed as a percentage of the food-and-drink subtotal rather than a flat sum, which is why a $40 dinner and a $200 dinner attract very different amounts for roughly the same amount of table time. The percentage convention is close to universal in US sit-down restaurants, patchy at bars and counter service, and absent or actively unwelcome across much of Asia and continental Europe.

The single word covers several transactions that behave differently once the money leaves your hand. Cash goes into the server's pocket that shift. A tip written on a card slip travels through payroll and usually arrives a week or two later, in most restaurants pooled among servers, bussers and bar staff. And a charge the restaurant itself prints on the check — "service charge", "20% gratuity, parties of six or more" — is a different instrument again, one you are billed for rather than one you offer.

What the percentage is a percentage of

The Tip Percentage you enter is applied to the Bill Amount field and to nothing else. Sales tax is computed separately from that same figure and added afterwards, which means Bill Amount has to be the pre-tax subtotal — the line on the check above the tax, covering food and drink only.

Type the bottom-line total in instead and two errors compound. The tax field charges tax on money that already contains tax, and the tip is taken from a base the tax has inflated. A $50 subtotal at 20% with an 8% tax rate should give $10.00 of tip and a $64.00 total; enter $54 with the tax field still at 8% and the calculator returns $10.80 of tip, $4.32 of tax and a total of $69.12.

If you prefer to tip on the post-tax figure — a common habit, and more generous rather than wrong — the way to do it here is to enter the tax-inclusive total as Bill Amount and set Sales Tax Percentage to 0. That returns $10.80 of tip on a $64.80 total, which is the honest version of the same intention.

Tip, service charge, and automatic gratuity

These three appear on checks interchangeably and are not the same thing. A service charge fixed by the employer and required of the customer is not a tip; the IRS classifies it as non-tip wages, taxed and reported like ordinary pay. An automatic gratuity for a large party sits in the same category, however it is worded on the menu.

State sales tax rules follow the same line, and this is where the difference costs money. California's guidance is blunt: an optional payment designated as a tip, gratuity or service charge is not subject to tax, while a mandatory one is included in taxable gross receipts even if the restaurant later hands the whole amount to staff. New York exempts a mandatory gratuity only if all three conditions hold — the charge is shown separately, it is identified as a gratuity, and the business gives the entire stated amount to its employees. Fail any one and the charge is taxed along with the rest of the bill.

For the person paying, the practical instruction is to read the itemized lines before adding anything. Six people with a $240 subtotal and an 18% automatic gratuity have already been charged $43.20, for a $283.20 total and $47.20 each. Adding another 18% on that finished figure costs a further $50.98 and moves each share to $55.70 — $8.50 a head for a line that was already on the check.

How Do You Calculate a Tip?

Three multiplications and one division, always in the same order. The order is the part worth knowing, because it is what settles the two questions people actually argue about: whether the tip includes the tax, and whether the split includes the tip.

The formula, written out

Tip        = Subtotal × (Tip % ÷ 100)
Sales tax  = Subtotal × (Tax % ÷ 100)
Total      = Subtotal + Sales tax + Tip
Per person = Total ÷ Number of people

Two details in that sequence carry all the weight. Tip and tax are both drawn from the subtotal, so the tip is never charged on the tax — the pre-tax convention is built into the arithmetic rather than offered as a setting. And the division happens last, on the finished total, so every share carries the same proportion of food, tax and tip.

The rounding control inserts one extra step, and only ever one:

Round Tip Amount   →  tip is rounded to the nearest dollar BEFORE the total is summed
Round Final Total  →  total is rounded to the nearest dollar AFTER tip and tax are added

Rounding never applies to both figures, and the per-person share is always divided out of whichever total survives that step. Nearest dollar means exactly that — this is not a round-up-to-be-generous button, and on a $92.48 total it rounds down to $92.00.

Step by step

Five fields, in the order they appear:

• Bill Amount — the food-and-drink subtotal, the line above sales tax. Not the amount at the bottom of the check.
• Tip Percentage — enter the number itself, so 18 rather than 0.18. US full-service restaurants sit between 15% and 20%.
• Sales Tax Percentage — your local combined rate. Set it to 0 if the tax is already inside the figure you entered above, or if you only want the tip.
• Number of People — 1 if you are paying alone. This field divides the total, so it must be at least 1; leave it empty and the division is impossible, and the calculator asks you to fill every field rather than printing a broken number.
• Rounding Option — No Rounding is the default and gives exact cents. The other two trade a few cents for a cleaner figure.

The panel returns four values every time: the tip, the tax, the total, and the per-person share.

Worked example: dinner for four

Four people, $86.40 of food and drink on the check, a combined sales tax rate of 8.875%, and 20% for the server.

Tip        = 86.40 × (20 ÷ 100)      = $17.28

Sales tax  = 86.40 × (8.875 ÷ 100)   = $7.67

Total      = 86.40 + 7.67 + 17.28    = $111.35

Per person = 111.35 ÷ 4               = $27.84

Result panel for this example

Tip: $17.28, Tax: $7.67, Total: $111.35, Per Person: $27.84

Exact, and awkward to hand over. Switching Rounding Option to Round Final Total pulls the total to $111.00 and each share to $27.75 — the table pays 35 cents less between them and everyone contributes the same clean figure. Round Tip Amount instead takes the tip from $17.28 to $17.00, which gives a $111.07 total and $27.77 each: a rounder number on the tip line for the server, a messier one for the group.

The right choice depends on who the round number is for. Cash on a bar top wants a round tip; four people reaching for their phones want a round total.

Doing it in your head

Move the decimal one place to the left and you have 10%. On a $68.40 subtotal that is $6.84, and every common rate is one step from there: double it for 20% ($13.68), add half of it for 15% ($10.26). All three match the calculator to the cent.

18% is the awkward one, and the reliable route is to work down rather than up: take 20% and subtract a tenth of that. $13.68 minus $1.37 is $12.31, which is exactly what the calculator returns for 18% of $68.40. Working up from 15% instead means adding three separate 1% steps and is where mental arithmetic usually goes wrong.

The shortcut degrades on odd cents, because you are rounding at every step and the calculator rounds only once at the end. It will be within a nickel, which is close enough for a decision and not close enough for a split.

Tip Chart: 15%, 18%, 20% and 25%

Every figure below comes out of the same formula the calculator runs, with the tax rate set to zero so the columns show the tip alone. Find the row nearest your subtotal and read across.

Tip amount by check size

The gap between 15% and 20% is always a quarter of the 20% figure — $2.50 on a $50 check, $5.00 on a $100 one. That ratio holds at every row, and it is the useful thing to carry around when you are hesitating between the two.

What you hand over, tip included

The same subtotals with the tip added, still before sales tax. This is the column to check against a card terminal that is offering you preset buttons.

Splitting one check

A $180 subtotal at 20% comes to $216.00 in total with no sales tax applied. Divided evenly:

The seven-person row is the honest one. $216.00 does not divide by seven into whole cents, so the share rounds up to $30.86 and seven of those come to $216.02 — two cents more than the check. Any split that does not divide cleanly leaves a cent or two on the table in one direction or the other, and the more people you add, the more often it happens.

Tipping Before or After Sales Tax

This calculator tips on the subtotal, which is the traditional American convention: the tax is a government charge that the server neither earned nor influenced, so it sits outside the base. Tax authorities draw the same boundary from the other direction — a voluntary tip is not part of the taxable sale in either California or New York, which is why it never appears in the tax line on your check.

The convention is a convention, not a rule, and plenty of people tip on the total either from habit or because the card terminal calculates its suggestions that way. The difference is real but modest, and it grows with the local tax rate rather than the size of your generosity.

Each row below takes 20% either from the subtotal or from the tax-inclusive figure, at tax rates spanning the practical American range.

At a 10.25% combined rate the post-tax habit costs about 2% more tip than the pre-tax convention — $2.05 on a $100 check. That is not a sum worth an argument at the table, but it is worth knowing which one you are doing, because a group where two people tip pre-tax and two tip post-tax will not reconcile.

To run the post-tax version here, enter the tax-inclusive total as Bill Amount and set the tax field to 0. Feeding a tax-inclusive figure in while leaving a rate in the tax field is the one combination that produces a wrong answer, because the tax is then charged a second time.

If the tax line on your check does not match what you expected, or you need to work the subtotal back out of a total you already have, use the Sales Tax Calculator.

How to Read Your Result

The panel returns four numbers. Three of them you could have guessed; the fourth is the one people misread.

The four figures

• Tip — the gratuity in dollars, taken from the subtotal alone. This is the number to write on the tip line of a card slip.
• Tax — the sales tax the calculator worked out from your rate. Compare it against the tax line printed on the check.
• Total — subtotal plus tax plus tip. This is what leaves your account.
• Per Person — the total divided by the number of people, so it already contains that person's share of tax and tip. It is not the tip per person.

Where the calculated tax and the printed tax disagree, trust the check. Restaurants apply different rates to different items in a number of states — prepared food, alcohol and packaged goods are not always taxed alike — and a single percentage field cannot reproduce that. When the two differ, enter 0 in the tax field and add the printed tax to the subtotal yourself before you type it in.

Which rounding option to use

No Rounding is the default and the right choice when you are paying by card and nobody has to count anything out. It gives exact cents on all four figures.

Round Tip Amount rounds the gratuity to the nearest dollar before the total is assembled. A $28.60 check at 20% has a $5.72 tip and a $34.32 total; with this option the tip becomes $6.00 and the total $34.60. Useful when you are leaving cash and want a figure you can actually build out of bills and quarters.

Round Final Total rounds the finished total instead, which is what you want when the check is being split. A $95.20 subtotal at 20% totals $114.24, which is $28.56 each between four; rounding the total to $114.00 makes it $28.50 each. Because it rounds to the nearest dollar it can go down as well as up — the same option on a $92.48 total gives $92.00 and takes 48 cents off the tip, so check the tip line afterwards if the service deserved better than that.

Choosing the percentage

The card terminal's middle button is not a norm, it is a default someone chose. Pew Research Center surveyed 11,945 US adults in August 2023 and found that for an average meal at a sit-down restaurant, 57% said they would tip 15% or less — including 2% who would leave nothing — while 12% named 18% and 25% said 20% or more. The same survey found 81% always tip at sit-down restaurants, so the near-universal behavior is leaving something, not leaving a fifth.

Counter service is a different world and the survey shows it: 25% of adults said they always or often tip at a coffee shop, and 12% at a fast-casual restaurant. The amounts involved are small in any case — the whole 10%-to-25% range on a $5 coffee spans 50 cents to $1.25, and on an $18 counter lunch it spans $1.80 to $4.50 — so at that end the real decision is a dollar or nothing, not a percentage.

Where the percentage compounds is repetition. A $45 subtotal twice a week is $6.75 of tip at 15% and $9.00 at 20%: $2.25 a meal, and $234.00 over 104 meals. That is the number to weigh if you eat out regularly and are deciding where your own default sits.

Who Actually Receives the Tip

The tip you calculate rarely goes to one person intact, and how it is classified changes what the recipient keeps. None of this changes the arithmetic, but it answers the question most people are really asking when they hesitate over the number.

Tip pooling is standard practice in American restaurants: the amount left for a server is commonly shared with bussers, runners and bar staff under a house formula. Cash and card tips also travel differently — cash is settled at the end of the shift, while a tip written on a slip runs through payroll and reaches the employee with their next paycheck.

Tips are taxable income to whoever receives them. An employee who takes $20 or more in cash tips in a calendar month is required to report the total to their employer, who then withholds on it like wages. A service charge is treated differently again: because the customer neither chose to pay it nor set the amount, the IRS classifies it as non-tip wages rather than a tip.

That classification acquired real money behind it under the 2025 federal tips deduction. For 2025 returns, workers in qualifying tipped occupations can deduct up to $25,000 of qualified tips, with the deduction phasing out above $150,000 of modified adjusted gross income ($300,000 filing jointly). Qualified tips must have been paid voluntarily and not be subject to negotiation, which is the same voluntariness test again — a mandatory service charge does not qualify. It is a deduction against income tax, not an exemption from payroll tax.

The practical consequence at the table is small but not zero: a genuine voluntary tip and an equivalent mandatory service charge are worth different amounts to the person who receives them, and in California and New York the mandatory version may also be carrying sales tax that the voluntary one is not.

Limits: When This Does Not Apply

The arithmetic is four lines long and there is very little in it to get wrong. The assumptions around it are another matter, and there are four situations where the number it returns is not the number you want.

Where percentage tipping is not the norm

The 15-to-25% range is a specifically American convention, tied to a wage structure in which tipped staff are paid a reduced cash wage and make up the difference from tips. It does not export. Service is customarily included in the price across much of continental Europe — many bills say so explicitly — and in Japan and South Korea an added tip is not expected and can be actively unwelcome. The calculator will happily compute 20% of a Tokyo dinner; the etiquette question is not one arithmetic can answer, and the right first step abroad is to look for a service line already on the bill.

When something is already on the bill

Automatic gratuities for large parties, mandatory service charges, event minimums and delivery fees all sit on the check before you add anything, and none of them is a tip in the sense this calculator means. Check the itemized lines first. If a gratuity is already applied, the subtotal you feed in should exclude it and any additional amount you choose to add is a second, separate tip — not a recalculation of the first. A delivery fee is a further trap: it usually goes to the platform rather than the driver, so it is not a substitute for a tip at all.

Pennies, and why the lines may not always add up

Each of the four figures is rounded to the nearest cent independently, while the total is built from the unrounded values. Whenever a rounded line lands on a half cent, the displayed figures and the displayed total end up a penny apart — often enough to notice, on something like one in five combinations of everyday subtotals and tax rates. A $50 subtotal at 20% with a 7.25% tax rate is the clean illustration: the true tax is $3.625, shown as $3.62, and the total of $63.625 is shown as $63.63 — so the visible lines sum to $63.62 against a stated $63.63. The total is the accurate figure; the tax line is the one that lost the half cent.

The per-person share has the same property in a form you will actually notice. Seven people splitting a $216.00 total are each shown $30.86, and seven times $30.86 is $216.02. On any split that does not divide evenly, treat the per-person figure as the amount to collect and let one person absorb the couple of cents rather than expecting the numbers to close.

What this tool does not do

It divides one check evenly, which is the wrong model when one person had the tasting menu and another had soup — for that you need per-item totals, and the tip should follow each person's own subtotal. It also assumes a single sales tax rate across the whole check, takes no position on state wage law or tip credits, and cannot tell you whether the service was worth the number you typed.