Free Expense & Cost Splitting Calculator

Split a restaurant bill, a month of rent, or a whole group trip — equally, by percentage, by exact amounts, or weighted by income, nights stayed or room size.

Every figure is worked out in whole cents, so the parts always add back up to the total. No account, no download, and nothing to install.

Equal, %, exact or by share
Always adds up to the cent
No signup
100% free
$

Everyone pays the same. Odd pennies go to the first people in the list.

Each person pays

$0.00

Enter a total amount and how many people are splitting it.

Built for one job

Calculators for a specific split

The form above splits one amount. These four do arithmetic it cannot: several payers, uneven nights, rent that moves separately from the bills.

Splitwise calculatorThe same four methods, mapped onto the vocabulary Splitwise users already think in — groups, balances, shares.
Rent split calculatorRent weighted by income or room size, with the utilities split their own way instead of riding along.
Who owes who calculatorSeveral people paid for things over a week. Enter what each of them paid and get the fewest payments that clear it.
Hotel & vacation rental splitGuests who arrived late or left early, split night by night rather than averaged across the whole stay.
How it works

Four steps, and no signup in the middle

The answer appears as you type. Nothing is submitted anywhere and nothing is stored.

  1. 1

    Start with the total

    One figure: the bottom line on the receipt, the month’s rent, the invoice for the beach house. Dollar signs and thousands separators are both fine — "$1,204.50" and "1204.5" are read the same way.

  2. 2

    Choose how you agreed to split it

    Equal when nobody is counting. By percentage when you settled on proportions. Exact amounts when you already know the figures. By share when you want the weighting done for you.

  3. 3

    Fill in the rows the method asks for

    An equal split only wants a headcount, up to 100. The other three give you one row per person, with a running total underneath so you can see whether the percentages have reached 100 or how many shares you have handed out.

  4. 4

    Read the breakdown, not just the headline

    Everyone appears twice over: as a share of the total and as an amount. The percentage is the sanity check — someone sitting on 41% of a bill they thought was going three ways is visible before anyone pays.

The four methods

Four ways to split a cost, and when to use each

Most disagreements about money are not arithmetic disagreements. They are disagreements about which of these four you should have used.

Equal split

Everyone pays the same

The default, and the right answer more often than the internet’s fairness debates suggest. Reach for it when the thing being split was genuinely shared — a taxi, a group gift, a table where nobody itemised — and when the effort of working out a fairer number costs more than the difference it would make.

An equal split is the only method that does not ask for names. Set a headcount, up to 100, and the total is divided across it.

Worked example

A $50.00 dinner, three people, nobody counting drinks.

First in the list$16.67
Second$16.67
Third$16.66

$50 does not divide by three. Rounding everyone to $16.66 leaves the table two cents short of the bill, so the odd pennies go to the top of the list and the three figures come to $50.00 exactly.

By percentage

You already agreed on the proportions

Use this when the proportions come from an agreement rather than a measurement. A couple who settled on 60/40 once and stopped relitigating it. Three people sharing a subscription where one of them uses it twice as much. A household that decided the person with the ensuite pays a bigger slice of everything.

The percentages have to reach 100. The running total sits under the list, because a column of numbers that should add to 100 but adds to 97 is a mistake you can only catch in aggregate — and the calculator says so plainly rather than quietly scaling everyone up to cover the gap.

Worked example

A $1,850.00 month of shared bills, split 45 / 35 / 20.

45%$832.50
35%$647.50
20%$370.00

Percentages are the method to use when the proportions are the thing you agreed on. If instead you have the raw numbers the proportions came from — three incomes, four room sizes — use shares and skip the step where you convert them into percentages by hand and introduce a rounding error.

Exact amounts

You know the figures already

Sometimes the split is not a calculation, it is a checksum. Everyone’s items are known, someone has already added them up, and what you want is the arithmetic verified rather than performed. Type what each person owes and the calculator tells you whether the parts and the whole agree.

Nothing is rescaled to force them to agree. If the amounts fall short of the total, the shortfall is named; if they overshoot, that is named too. You are the one who knows which figure is wrong, and a tool that silently adjusted somebody’s stated number would be hiding exactly the thing you opened it to find.

Worked example

An $84.30 bill, itemised as $32.10, $27.60 and $18.90.

Entered$78.60
Bill total$84.30
Flagged as unassigned$5.70

The three itemised shares come to $78.60, so $5.70 of the bill belongs to nobody — in practice, the tip that nobody had allocated yet. That gap is the answer you came for, and it is the one an equal split would have buried.

By share

Let the weighting do the work

Shares are for when the split should follow a number you already have. Monthly income. Nights stayed. Square footage. How many weeks of the month somebody was actually in the house. Enter the raw numbers as weights and the arithmetic follows them, in the correct proportion, down to the cent.

A share is any positive number, and only the ratio matters: two people on 3 and 1 get exactly the same split as 75 and 25, or 300 and 100. That is what makes it the most useful of the four — you never have to convert anything into a percentage first.

Worked example

A $560.00 grocery month for a house of four, one of whom was away for half of it. Shares of 4, 4, 4 and 2.

Home all month$160.00
Home all month$160.00
Home all month$160.00
Away for two weeks$80.00

Fourteen shares in total, so each share is worth $40.00. The same method handles rent by income, a rental split by nights stayed, and a room-by-room split by floor area — those have their own calculators below, with the weights already set up for you.

Whole cents

Why the parts always add up to the total

Ten dollars does not divide by three, and most split calculators handle that by looking away. They round every share the same direction and hand you three numbers that come to $9.99, or three that come to $10.02, or a figure with fourteen decimal places that no card reader has ever accepted.

Every figure here is worked out in whole cents from the start. The total is divided by weight, each share is floored, and the leftover pennies are then handed out one at a time to whoever was rounded down hardest — Hamilton’s largest-remainder method, the same rule used to allocate seats to parties in a legislature. Ties break toward the earlier row, so the same inputs always produce the same figures rather than two people reading the same split and seeing different numbers.

On a dinner this is worth one cent and nobody would notice. On rent across five people, twelve months a year, or a group trip with thirty expenses on it, the drift accumulates — and “the numbers don’t quite add up” is exactly how a shared spreadsheet loses the trust of the people using it.

The same instinct governs the other two places the arithmetic can disagree with you. Percentages have to reach 100, and you are told when they do not. Exact amounts that fall short of the total or overshoot it are reported as a gap rather than quietly rescaled to fit, because the whole reason you typed them in was to find out whether they agreed.

Splitting $10.00 three ways — four ways to answer it, one of them right.

  • Round each share down

    $3.33 · $3.33 · $3.33

    Comes to $9.99. A penny of the bill belongs to nobody.

  • Round each share up

    $3.34 · $3.34 · $3.34

    Comes to $10.02. The table has overpaid by two cents.

  • Print the raw division

    $3.3333333333333335

    Restates the question instead of answering it. Nobody can pay that.

  • What this calculator does

    $3.34 · $3.33 · $3.33

    Comes to $10.00, exactly, every time.

The awkward part

Splitting a bill with tax and tip

There is no tax field and no tip field here, and that is deliberate. Sales tax added at the till, VAT already inside the price, a service charge on the bill and a tip you choose are four different problems, and one box labelled “tax” gets three of them wrong. You enter the number you are actually paying — and then pick the method that distributes it honestly.

Split the grand total

Equal split

Enter the figure at the bottom of the receipt — food, tax, service, the lot — and split it equally. For a table where everyone ate roughly the same thing this is both the simplest answer and the correct one, and it is what most people mean when they say "let’s just split it".

It stops being right the moment one person ordered a $9 salad and another ordered the tasting menu, because an equal split of the grand total makes the salad eater subsidise somebody else’s tax and tip as well as their food.

Let tax and tip follow what people ate

By share

This is the one worth knowing. Enter the grand total as the amount, choose the share method, and give each person their pre-tax subtotal as their share. Everyone then carries exactly the same mark-up on their own food, and you never have to work out anybody’s slice of the tax by hand.

$96.00 of food, 10% tax and a 20% tip on the pre-tax subtotal — $124.80 on the card. Enter 124.80 as the total and 42, 30 and 24 as the shares.

OrderedSharePays
$42.0042$54.60
$30.0030$39.00
$24.0024$31.20

The bill came to 1.3× the food, so everybody pays 1.3× what they ordered — $42 becomes $54.60, $24 becomes $31.20 — and the three figures add back to $124.80 exactly. No line of the receipt had to be assigned to anybody.

When one share should not carry the mark-up

Exact amounts

Sometimes proportional is still wrong. The designated driver who had water while three bottles of wine went round the table should not be paying a proportional slice of a tip inflated by alcohol, and in a lot of places the alcohol was taxed at a different rate anyway.

That is what exact amounts are for: work out the figure for the person who is the exception, type the amounts in, and let the calculator tell you whether what is left over covers the rest.

One decision to make before you start typing rather than after: whether the tip is calculated on the pre-tax subtotal or the post-tax total. On a $96 dinner the difference is under two dollars, but it is the kind of thing that is much easier to agree on while the bill is still on the table.

The honest part

When one calculation is not enough

A calculator answers a question and then forgets it. That is a feature until the moment it is not.

Nothing is remembered

Refresh the page and the figures are gone. The arithmetic runs in the browser and no calculation is stored, which is the right trade for a bill at a table and the wrong one for a household you are running month to month.

One expense at a time

The form splits a single amount. A week of a group trip is thirty amounts with different people on each of them, and adding them into one total loses the information you need to work out who is actually owed what.

No running balances

There is no record that a debt existed, no record that it was paid, and nothing that carries a balance from one calculation to the next. That is the difference between a calculator and an expense app, and it is not a difference a page can close.

Several people paid for thingsThe settle-up calculator takes a stack of expenses and different payers, and gives back the shortest list of payments that clears the group.
You would rather work in a spreadsheetTemplates for rent, trips and shared households, if a sheet you can edit and share suits the group better than a page.

And when it is a habit rather than an evening

Running balances that survive a closed tab. Receipts turned into line items you assign person by person. Settlement records, so a debt that was paid stays paid. Recurring expenses, comments when somebody disputes a figure, and a shared history nobody has to reconstruct from memory. That is an application, and it is what SuperDivide is.

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Frequently Asked Questions

Everything you need to know about splitting expenses

Enter the total amount, then pick a split method: equal, by percentage, exact amounts per person, or by share. Anything other than an equal split gives you a row per person to name them and set their number. The breakdown updates as you type.
Yes. Percentages work when you know the proportions, exact amounts when you know the figures, and shares when you want the maths done for you — enter each person's income, nights stayed, or room size and the split follows those weights. Useful when one person had more drinks at dinner, or when rent should track what people earn.
Percentages are for proportions you already agreed on — 60/40, or 45/35/20 — and they have to add up to 100. Shares are for the raw numbers those proportions would have come from: three incomes, four room sizes, the number of nights each person stayed. Enter the raw figures as shares and the calculator works out the proportions, which saves you converting them into percentages by hand and rounding as you go. Only the ratio matters, so shares of 3 and 1 give exactly the same split as 75 and 25.
Choose the "By share" method and enter each person's monthly income as their share. On $1,500 rent with incomes of $6,000 and $4,000, that comes to $900 and $600 — each person pays the same fraction of what they earn. The dedicated rent split calculator goes further: it handles the utilities separately from the rent, since bills are often shared evenly even when the rent is not.
Enter the grand total from the bottom of the receipt — there is no separate tax or tip field, because sales tax added at the till, VAT already inside the price, and a service charge on the bill all behave differently. For a table that ate roughly the same thing, split that total equally. When people ordered very differently, choose "By share" and enter each person's pre-tax subtotal as their share: everyone then carries the same mark-up on their own food. On $96 of food that comes to $124.80 with tax and tip, subtotals of $42, $30 and $24 work out as $54.60, $39.00 and $31.20.
Absolutely! The expense splitting calculator is 100% free to use with no signup required. You can calculate as many splits as you need. If you want to save your calculations and get them emailed to you, we just ask for your email address to send you the results.
The calculator is perfect for splitting rent with roommates, dividing restaurant bills, sharing travel costs, splitting household expenses, calculating group gift contributions, dividing utility bills, and any other shared expense situation.
Every figure is worked out in whole cents, so the individual amounts always add back up to the total exactly. Splitting $10 three ways gives $3.34, $3.33 and $3.33 rather than three roundings of $3.33 that quietly lose a penny. The leftover pennies go to whoever was rounded down hardest, and ties break the same way every time, so the same inputs always produce the same figures.
An equal split takes a headcount of up to 100. The other three methods give you a row per person that you add one at a time, so you can go as wide as you need — though past a couple of dozen names, a spreadsheet or the app is usually the more comfortable place to work.
The arithmetic is currency-neutral — it works in whole units of whatever you type in, so the split is correct in any currency. The results are formatted in US dollars and there is no exchange-rate conversion, so splitting in euros gives you the right numbers with the wrong symbol in front of them.
Yes! Click the "Save & Share This Calculation" button after calculating your split. Enter your email to receive a PDF of your calculation that you can share with others. You'll also get early access to the full SuperDivide app with even more features.
For ongoing expense tracking, check out our free templates or sign up for early access to the SuperDivide app. The app lets you track multiple expenses, see running balances, and record settlements so balances stay accurate.
This calculator is great for one-time calculations. The full SuperDivide app includes AI receipt scanning with itemized splits, running balance tracking, payment profiles and settlement records, group management, recurring expenses, comments, and disputes. Join the waitlist to get early access!

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