Split Payment Calculator
Four friends, one check, and the usual thirty seconds of everyone staring at it. This calculator splits the bill two ways: evenly, with an itemized breakdown of bill, tip and tax per person, or proportionally, where each person’s food subtotal decides their share of the tip and tax. A tip-base toggle covers the pre-tax versus post-tax question, and quick tip buttons make 10, 15, 18, 20 or 25% a single tap.
Every figure is rounded to cents for display. If rounded shares ever total a cent off the grand total, settle the odd cent on whoever ordered most.
Quick Answer
Four people share a $100 bill with $8 tax and a 20% pre-tax tip. The tip is $20.00, the grand total $128.00, and each person pays $32.00, of which $5.00 is tip. Flip the toggle to post-tax and the tip becomes $21.60, the total $129.60, each paying $32.40. In proportional mode with food subtotals of $60 and $40 (20% tip, $8 tax), the shares are $76.80 and $51.20.
Key takeaways
- Even mode divides everything equally: grand total = bill + tip + tax, then one division. It is exactly fair only when orders are similar.
- Proportional mode divides the tip and tax by what each person ordered: share = own subtotal + tip × (own / combined) + tax × (own / combined).
- The tip-base toggle is the whole pre-tax versus post-tax debate in one control, and pre-tax is the default because it is the usual convention.
- Blank tax counts as $0, blank subtotals count as $0, and proportional mode caps at 12 people; even mode has no cap.
How to use the split payment calculator
Pick the tab that matches your table, fill in the numbers from the receipt, and click Calculate split. The worked example is pre-filled, results stay hidden until you calculate, and Reset restores the example values.
- Even split tab: enter the bill total before tip and tax, the tax amount from the receipt, the tip percentage (tap a quick button or type your own), and the number of people. Choose pre-tax or post-tax for the tip base.
- Proportional split tab: enter the number of people, then each person's food subtotal in the boxes that appear. The tip and tax are allocated by subtotal share, the way the fairest bill-splitting apps do it.
- Read the itemized lines: even mode shows the bill, the tip with its base, the tax, the grand total, the headcount and the tip per person; proportional mode lists every person's share against their subtotal.
- Share it: Copy my results puts the itemized text on your clipboard for the group chat; Share results opens your device's share sheet where available.
A note on the inputs: the tax fields take a dollar amount from the receipt, not a percentage, because receipts print the amount. If your receipt only shows a rate, multiply it by the bill first. For the single-percentage tip math on its own, the 15 percent tip calculator covers the 15% case.
The split payment formula
Even split: the grand total is the bill plus tip plus tax, and each person pays the grand total divided by the headcount. The tip itself is bill × tip% / 100 on the pre-tax base, or (bill + tax) × tip% / 100 on the post-tax base:
Grand total = Bill + Tip + Tax Each pays = Grand total ÷ People
Proportional split: each person's share is their own subtotal plus their slice of the tip and the tax, where each slice follows their share of the combined subtotal:
The two modes agree when everyone ordered the same amount, which is a good sanity check: two $50 subtotals with 20% tip and $8 tax give $64.00 each, exactly what even mode gives for $100 across 2 people. Splitting a recurring shared cost by income rather than a one-off bill works differently; the split rent by income calculator handles that case.
Worked example: the $128 check, checked two ways
The calculator opens with the even example pre-filled. Clicking Calculate split reproduces these lines exactly:
On the proportional tab, the pre-filled subtotals of $60 and $40 (with the same 20% tip and $8 tax) give Person 1: $60 + $20 × 0.6 + $8 × 0.6 = $76.80, and Person 2: $40 + $20 × 0.4 + $8 × 0.4 = $51.20. The two shares add to $128.00, the same grand total as the even split, which is how you know the allocation is consistent.
Pre-tax versus post-tax tipping: what actually changes
Custom varies, but the common US convention is pre-tax: the tip rewards the service, not the tax collector. The Emily Post Institute's etiquette guide lists wait service at 15 to 20 percent pre-tax, and the calculator defaults to it. Flipping the toggle changes the tip base from the bill to bill-plus-tax. On a $100 bill with $8 tax split four ways:
| Tip % | Pre-tax tip | Pre-tax each pays | Post-tax tip | Post-tax each pays |
|---|---|---|---|---|
| 15% | $15.00 | $30.75 | $16.20 | $31.05 |
| 18% | $18.00 | $31.50 | $19.44 | $31.86 |
| 20% | $20.00 | $32.00 | $21.60 | $32.40 |
| 25% | $25.00 | $33.25 | $27.00 | $33.75 |
The difference is small on one dinner and worth knowing about: post-tax tipping effectively tips the tax rate on top of the tip rate. At 20% with 8% tax, the toggle costs each person an extra $0.40. Either choice is defensible; the honest move is picking one deliberately instead of letting the register decide.
What competing calculators miss
Bill splitters split into three camps, and each leaves something on the table:
- Tip-plus-even-split tools (BreezyCalc, Calculate.to, Pulsafutura): tip math with a headcount division, sometimes with quick buttons. BreezyCalc even explains proportional splitting in its guide text, but its tool cannot compute one. Fine when everyone ordered alike; no answer for the steak-and-soup table.
- Toggle tools (HighCalc): the pre-tax / post-tax choice plus quick tip buttons and per-share rounding, which is genuinely useful. But there is no proportional mode: unequal orders still get divided evenly.
- Itemized splitters (CalculatorsHub, CalculatorMax): custom amounts or percentages per person, typed by hand. They never allocate the tip and tax automatically by subtotal share, so you do the proportional arithmetic yourself, which is the part people get wrong.
- The gap this page fills: both modes in one tool, the pre/post-tax toggle on both, one-tap tip buttons, proportional tip-and-tax allocation from per-person subtotals, itemized lines including tip per person, and results you can copy straight into the group chat.
Frequently asked questions
Custom varies, but the common US convention is pre-tax: the tip rewards the service, not the tax collector. The Emily Post Institute's etiquette guide lists wait service at 15 to 20 percent pre-tax. The toggle above lets you do either; pre-tax is the default.
15% to 20% for sit-down service in the US, 10% for casual counter service. Tipping norms differ by country, so adjust when traveling. The quick buttons cover 10, 15, 18, 20 and 25; you can type any other value, and a Pew Research Center survey found 92% of US adults always or often tip when dining at sit-down restaurants.
Each person's share is their own subtotal plus their slice of the tip and the tax, where each slice follows their share of the combined subtotal. With subtotals of $60 and $40, a 20% pre-tax tip ($20) and $8 tax: Person 1 pays $60 + $12 + $4.80 = $76.80, and Person 2 pays $40 + $8 + $3.20 = $51.20.
A blank subtotal counts as $0, so that person pays $0.00 and the tip and tax are divided among the rest. At least one subtotal must be greater than zero, or the tool asks you to enter one.
They do not in the display: every figure is rounded to cents. If rounded shares ever total a cent off the grand total, settle the odd cent on whoever ordered most.
Add it to the bill total if it replaces the tip, or to the tax field if it is charged on top of your own tip. Do not tip on top of a service charge unless you mean to. Note the legal distinction: the IRS treats a mandatory service charge as wages, not a tip. For catered events, where service charges and gratuities are often bundled into the contract, the catering tip calculator handles that situation.
No. Proportional mode builds one subtotal box per person up to 12; typing 15 gives you 12 boxes. For larger groups, even mode takes any headcount of 1 or more.
Yes. Even mode divides the bill, the tip and the tax equally, which is only exactly fair when orders are similar. When one person had the steak and another had the soup, proportional mode allocates the tip and tax by subtotal share instead.
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References
- Internal Revenue Service. Publication 531, Reporting Tip Income. Accessed October 23, 2026.
- U.S. Department of Labor, Wage and Hour Division. Fact Sheet #15: Tipped Employees Under the Fair Labor Standards Act. Accessed October 23, 2026.
- Emily Post Institute. Tipping Etiquette 101: A Comprehensive Guide on Tipping. Accessed October 23, 2026.
- Pew Research Center. Tipping Culture in America: Public Sees a Changed Landscape. Accessed October 23, 2026.
- Federal Reserve Bank of Richmond. Tipping: From Scourge of Democracy to American Ritual. Accessed October 23, 2026.
- Tax Foundation. State and Local Sales Tax Rates, Midyear 2025. Accessed October 23, 2026.