Split expenses calculator
Free bill splitter and group expense calculators for restaurant bills, rent, and trips. Pick a tool below, or use the quick splitter for an even split right now.
To split expenses in a group, add up what every person paid, work out each person’s fair share of the total, and subtract one from the other. Anyone who paid more than their share is owed money; anyone who paid less owes it. The calculators below do this for you.
Free · No signup · Runs in your browser · Nothing sent to a server
Quick split: work out what each person owes
Enter an amount to see each share.
Need tip and tax? Split bill calculator. Many expenses, many payers? Trip expense calculator.
Which expense splitting calculator do you need?
| Your situation | People | Split method | Calculator |
|---|---|---|---|
| One restaurant bill, everyone pays the same | 2–20 | Equal | Tip calculator |
| One bill, people ordered different things | 2–15 | Itemised, tax and tip in proportion | Split bill calculator |
| Rent and utilities every month | 2–6 | Equal, by income, or by room size | Rent split calculator |
| Someone moved in or out mid-month | 1–6 | By days present | Prorated rent calculator |
| A whole trip, several people paying | 2–20 | Mixed, then settle up | Trip expense calculator |
| A road trip, working out fuel | 2–8 | By distance ridden | Gas split calculator |
The real decision is usually simpler than it looks: is this one bill or many expenses building up over time? One bill is a splitting problem, solved the moment you enter the numbers. Many expenses across several payers is a settlement problem: you need a running balance before you know who owes who anything.
All Splitwiser calculators
Eating out and one-off bills
- One bill, work out the tip Tip calculator Enter the bill and a tip percentage to get the tip, the total, and what each person owes if you are splitting it evenly.
- One bill, uneven orders Split bill calculator Split a restaurant bill by what each person actually ordered, with tax and tip added in proportion rather than flat.
Rent and household
- Recurring household costs Rent split calculator Divide rent and utilities between roommates equally, by income, or by room size and square footage.
- Moving in or out mid-month Prorated rent calculator Work out the exact prorated rent for a partial month, using actual calendar days or a flat 30-day month.
Trips and travel
- Many expenses, many payers Trip expense calculator Track every cost across a group trip, then get each person’s balance and the fewest payments needed to settle up.
- Road trip fuel costs Gas split calculator Work out the total fuel cost for a road trip and split it between riders, for gas or electric vehicles.
The nine ways to split a shared cost
| Method | How it works |
|---|---|
| Equal split | Total ÷ number of people. Everyone pays the same amount. |
| Itemised, by what you ordered | Each person pays for their own items, and shared items are divided among the people sharing them. |
| By percentage | Fixed, agreed percentages per person, however the group has decided to split it. |
| By shares or weights | Each person counts as a certain number of shares. A couple sharing one room might count as two. |
| By income (proportional) | Share = total × (your income ÷ combined income), so the cost stays the same share of everyone’s pay. |
| By square footage or room size | Share = rent × (your room’s square footage ÷ total private square footage). |
| By days present (prorated) | Share = cost × (days you were there ÷ total person-days). Used when someone moves in or out mid-month. |
| By distance or usage | Share = cost × (your usage ÷ total usage). Most common for splitting fuel on a road trip. |
| Adjustment split | Everyone starts on an equal base, then one person’s share is adjusted up or down by a fixed amount. |
Most groups do not pick one method and apply it to everything. Rent might be split by room size while groceries are split evenly, and a road trip might mix a per-person base cost with a distance-based fuel adjustment. Mixing methods per expense is usually fairer than forcing one rule onto every cost.
The method matters more than the group size. A fair split for two roommates and a fair split for six festival-goers use the exact same maths, just with more people in the total.
How to work out who owes who in a group
To calculate who owes what, work out each person’s net balance once every expense is logged:
net balance = (total they paid) − (total they owe)
positive = they are owed money · negative = they owe money
Say three friends share a $300 weekend: Alex paid $180, Sam paid $90, and Jo paid $30. Split evenly, each person’s fair share is $100. Alex’s balance is +$80 (paid $180, owed $100), Sam’s is −$10, and Jo’s is −$70. Sam and Jo owe Alex $10 and $70. That is two payments, not the six it would take if everyone tried to pay everyone back individually.
This is what simplifying debts means: instead of every payer settling with every other payer, match the largest debtor to the largest creditor and repeat until every balance is zero. A group of eight with a dozen expenses usually settles in three or four payments, not eight.
Once you know who owes who, settle up however you normally do: Venmo, Zelle, Cash App, PayPal, bank transfer, or cash. The trip expense calculator works out the balances and the minimum payments automatically for a whole trip’s worth of expenses.
A worked example: a weekend away for four
Four friends, Alex, Sam, Jo, and Priya, share a weekend away. Priya joins a day late, so she skips the first expense. Here is everything that got paid:
| Expense | Amount | Paid by | Split between |
|---|---|---|---|
| Cabin (2 nights) | $400 | Alex | All 4 |
| Friday dinner | $120 | Sam | Alex, Sam, Jo |
| Groceries | $80 | Jo | All 4 |
| Saturday activity | $140 | Alex | All 4 |
| Gas | $60 | Priya | All 4 |
Total spent: $800. Priya’s fair share is smaller since she missed Friday dinner; everyone else’s share includes it. Working through each person’s paid-minus-owed balance: Alex is owed $180, Sam owes $65, Jo is owed $5, and Priya owes $120. Simplified, that settles in two payments: Priya pays Alex $120, and Sam pays Jo (or Alex, either works) the remaining $65. Four people, five expenses, one late arrival, two payments to settle it.
When a calculator is enough, and when you need an app
A calculator wins for a single moment of maths: one bill, one trip total, one month’s rent. Type in the numbers, get the answer, done. A spreadsheet can handle this too, and for a single shared bill, it is genuinely fine.
Where a spreadsheet breaks down is when costs accumulate over days or weeks and more than one person is paying. Someone forgets to log an expense, a formula gets overwritten, and by the time you are trying to settle up nobody agrees on the running total. That is when a proper shared ledger, rather than a calculator or a spreadsheet, earns its keep.
Free during beta, no card needed. Or read how Splitwiser compares to other splitting apps.
Common questions
How to split expenses in a group?
Add up what each person paid, work out each person’s fair share of the total, then subtract one from the other. Anyone who paid more than their share is owed money; anyone who paid less owes it. The calculators on this page do this automatically.
What is the fairest way to split group expenses?
It depends on the cost. Split one-off meals by what people ordered, recurring rent by room size or income, and shared group costs like a taxi evenly. Mixing methods per expense is usually fairer than applying one rule to everything.
Do these calculators store my data?
Nothing is sent to a server and no account is needed. Your last entries are saved locally on your own device so you do not have to retype them, and they clear automatically after a day.
How do you split expenses between friends when everyone paid something different?
Work out each person’s net balance: what they paid minus their fair share of the total. Positive means they are owed money, negative means they owe it. Then settle the balances in as few payments as possible.
How do you split a bill when people ordered different things?
Split it by item rather than evenly: each person pays for what they ordered, and shared items like appetizers are divided among the people sharing them. Tax and tip get added in the same proportion. Our split bill calculator does this automatically.
How do you split rent when the rooms are different sizes?
Divide each bedroom’s square footage by the total square footage of all bedrooms, then apply that percentage to the rent. A bigger room pays a bigger share. Our rent split calculator handles this automatically.
Is a split expenses spreadsheet good enough?
For a single bill, yes, a spreadsheet is fine. It breaks down once several people are paying for different things over several days: the running balance gets hard to keep straight, and someone always ends up chasing a payment.
Do I need an account to use these calculators?
No. Every calculator on this page runs entirely in your browser, works without signing up, and gives instant results. An account is only useful if you want to keep tracking shared costs after the maths is done.