Bill Splitting Calculator: Formulas & Quick Tables (2026)

The bill splitting calculator formula

Every bill splitting calculator, app or website, runs the same arithmetic. Once you know it, you don’t need any of them.

1. Find the subtotal: food and drinks before tax.
2. Build your multiplier: 1 + tax rate + tip rate. With 8% tax and a 20% tip, that is 1 + 0.08 + 0.20 = 1.28.
3. Multiply the subtotal by the multiplier to get the final total.
4. Divide by the number of people for an even split.
5. Round up each share to a convenient amount and let the leftover go to the tip.

This version assumes the tip is calculated on the pre-tax subtotal, the traditional approach. If your group tips on the post-tax total, the multiplier becomes (1 + tax) × (1 + tip): with 8% tax and 20% tip, 1.08 × 1.20 = 1.296. The difference on a $100 subtotal is $1.60, so either is fine as long as everyone uses the same one. We explain the trade-offs in more depth in how to split a bill with tax and tip.

Per-person lookup table

For a quick even split, find your subtotal (before tax) in the left column and your group size across the top. Figures assume 8% sales tax and a 20% tip on the pre-tax subtotal, so multiplier 1.28. Illustrative; last checked November 2026.

If your subtotal falls between rows, scale proportionally: $120 is 1.2 times the $100 row, so 4 people pay $32.00 × 1.2 = $38.40 each.

Tax and tip multipliers by state rate

Sales tax on restaurant meals varies by state, county and city, so check the tax line on your receipt. Then pick the multiplier that matches. Tip is on the pre-tax subtotal.

For sit-down service in the US, a tip of 15% to 20% is common practice. Canadian norms and provincial taxes differ; see our guide to tipping in Canada by province. If the receipt already includes an automatic gratuity or service charge, leave the tip out of the multiplier; our explainer on service charge vs tip covers the difference.

How to do it on a phone calculator

Any phone’s built-in calculator handles this in three steps. Example: $186.50 subtotal, 7% tax, 18% tip, 5 people (multiplier 1.25).

1. Type 186.50
2. Press × 1.25 = to get $233.13, the final total.
3. Press ÷ 5 = to get $46.63 each. Round to $47.

Check the result against the receipt’s tax line: 7% of $186.50 is $13.06. Add the tip ($33.57 at 18%) and the subtotal and you get $233.13, which matches.

Spreadsheet formulas you can copy

For a recurring dinner group, a small spreadsheet in Google Sheets or Excel becomes your own bill splitting calculator. Put the inputs in column B:

For an itemized split, list each person in column D with what they ordered in column E, and put =E2*$B$5 in column F. Each row then shows that person’s share including tax and tip.

Uneven splits: the itemized calculator

Even splits are fast, but unfair when one person had a salad and water while another had steak and cocktails. The fix uses the same multiplier: multiply each person’s own items by it.

Rounding each share up gives $194, two dollars over, which simply goes to the tip. Shared appetizers or bottles get divided among the people who had them first, then added to each person’s “ordered” column. For more worked scenarios, see how to split a restaurant bill, and for when to choose even versus itemized, how to split the bill fairly.

Which calculator method should you use?

You have four options, and the right one depends on the group and the moment.

• Mental math works for two or three people with similar orders. Add roughly 30% to the subtotal for tax and tip in most of the US, divide, and round up. It is not exact, but it is close enough for a casual lunch.
• The lookup table above is fastest when the group agreed on an even split. Screenshot it and you never need to calculate a common split again.
• A phone calculator is best for exact even splits and for itemizing when there are only a few people. It takes under a minute.
• A spreadsheet or expense app pays off for recurring groups, trips and roommates, where many small bills add up and someone needs a running balance.

Whatever you use, say the number out loud and post it in the group chat, so everyone pays the same amount and nobody has to ask twice. Clear numbers are the difference between a relaxed end to the meal and an awkward ten minutes of passing a phone around the table.

Common calculation mistakes

• Tipping twice. Large-party bills often include an automatic gratuity. Check the receipt before adding a tip.
• Dividing the subtotal instead of the total. Splitting $150 four ways gives $37.50, but each person actually owes $48.00 with tax and tip.
• Forgetting the person who didn’t drink. Even splits quietly charge non-drinkers for the bar tab; itemize drinks or take them out first.
• Rounding down. Rounding every share down leaves the card holder short. Round up.
• Not agreeing on the method first. Decide even or itemized before ordering, not when the check lands.

If one person pays the whole check and the others reimburse, an expense app keeps the tally; our comparison of Splitwise vs Tricount looks at two popular free options.

The easiest bill to split is the one everyone agreed on before ordering. Want to turn this into an actual plan? MeetNow is a free app for meeting people in person: a host posts a plan at a public place, says who pays (host pays, split, pay your own or free) and picks who joins. It is live on the web and works in your browser, starting in Malta: open MeetNow and see the plans posted in Malta.

Frequently asked questions (FAQ)

What is the formula for splitting a bill with tip?

Per person = subtotal × (1 + tax rate + tip rate) ÷ number of people, when the tip is calculated on the pre-tax subtotal. With 8% tax and a 20% tip, that is subtotal × 1.28 ÷ people.

How do I split a bill unevenly?

Work out one multiplier by dividing the final total by the subtotal, then multiply what each person ordered by it. Each person pays their own items plus a proportional share of tax and tip.

Should I round up when splitting a bill?

Rounding each share up to the nearest dollar is common and keeps payments simple. The extra few cents or dollars usually go to the tip, which servers appreciate.

Is there a simple way to split a bill on my phone without an app?

Yes. Type the subtotal, multiply by your multiplier (for example 1.28), then divide by the number of people. Three keystroke steps on any phone calculator give each person’s share.

What tip percentage should I use?

For sit-down service in the US, 15% to 20% is common practice, with 18% to 20% typical for good service. Check the receipt first: some restaurants add an automatic gratuity for large groups.

Featured photo: two vegetarian pizzas on a rustic wooden restaurant table, by Nenad Stojkovic, CC BY 2.0, via Wikimedia Commons.