Free rent split calculator
Split the rent fairly in two seconds. Enter the total rent and pick a method — equal, by room size, or by income — and the calculator returns exactly what each roommate owes, with the shares always adding back to the full rent — updated live, as you type.
On this page15 sections
| Roommate | Room size | Rent owed |
|---|---|---|
| Roommate 1 | 200 sq ft | $800.00 |
| Roommate 2 | 150 sq ft | $600.00 |
| Roommate 3 | 150 sq ft | $600.00 |
Estimates only, based on the values you enter. Agree your split in writing before move-in.
Results are estimates. Consult a professional.
What is a rent split calculator?
A rent split calculator divides one total rent across several roommates and tells each person exactly what they owe. The simplest version splits the rent equally; a fair one lets you weight each share by something that differs between roommates — the size of their room or the size of their paycheck. This rent split calculator does all three, live, the moment you enter the rent and pick a method, so a house of two, three, or four can settle on a number in seconds instead of an argument.
Splitting rent evenly is the default, but it is only fair when the rooms and the incomes are roughly equal. The moment one roommate gets the big bedroom with the en-suite, or one earns far more than another, an even split starts to feel unfair — and unfair rent is one of the most common sources of roommate resentment. The fix is to pick a method everyone agrees is reasonable before anyone moves in, and to write it down.
Three fair ways to split rent, compared
There is no single 'correct' way to split rent — only the method your household agrees is fair for your situation. The three below cover almost every case. Equal is for evenly-matched rooms and incomes; room size is for unequal bedrooms; income is for unequal paychecks (and is the usual answer for couples).
| Method | Best when | How each share is set |
|---|---|---|
| Equal split | Rooms and incomes are similar | Total rent ÷ number of roommates |
| By room size | Bedrooms differ in size or have a private bath | Proportional to each room's square footage |
| By income | Roommates or partners earn very different amounts | Proportional to each person's income |
Pick one method for the whole house — mixing methods per person reintroduces the unfairness you were trying to remove.
A worked example using the rent split calculator
Ava, Ben, and Cara rent a $2,000 apartment. Ava has the big bedroom; the other two are smaller. Here is how they use the calculator — first equally, then by room size — and see the difference.
Step 1 — Start with an equal split
They enter $2,000 total rent and choose Equal. The calculator divides $2,000 by three roommates and returns $666.67 each. Simple — but Ava's room is noticeably bigger, so the others feel they are overpaying.
Step 2 — Switch to splitting by room size
They measure each bedroom and switch the method to By room size. Ava's room is 200 sq ft; Ben's and Cara's are 150 sq ft each, for 500 sq ft total. The calculator multiplies the rent by each room's share of that total.
| Roommate | Room size | Share of sq ft | Rent owed |
|---|---|---|---|
| Ava (big room) | 200 sq ft | 40% | $800.00 |
| Ben | 150 sq ft | 30% | $600.00 |
| Cara | 150 sq ft | 30% | $600.00 |
| Total | 500 sq ft | 100% | $2,000.00 |
By room size: Ava pays $800, Ben and Cara $600 each — and the three shares still add up to exactly $2,000.
How to split rent by room size
Splitting by room size — by square footage — is the fairest method when bedrooms differ. The person with the bigger room pays more, in direct proportion. Measure only the private bedrooms; shared common areas like the kitchen, living room, and shared bathrooms are paid for by everyone and don't enter the calculation.
- Measure each bedroom in square feet (length × width). Leave out common spaces.
- Add the bedroom areas together to get the total private square footage.
- Divide each room's area by that total to get its share, then multiply by the rent.
How to split rent based on income
Splitting by income keeps rent the same share of each person's pay. It is the usual answer when one roommate earns far less than the others, and the standard approach for couples with unequal salaries — splitting 50/50 across a big income gap is a leading cause of financial resentment. Add up everyone's income, work out each person's percentage of the total, and apply that percentage to the rent.
Combined income is $100,000. The higher earner makes 60% of it and the lower earner 40%. On $1,800 rent, that's $1,080 and $720 — instead of $900 each. The lower earner keeps the same share of their pay free as the higher earner does.
Gross vs net is a real choice. Splitting on gross income is simpler and the figures are easy to share; splitting on net (take-home) pay reflects what each person can actually spend after tax and is often fairer when tax situations differ. Pick one and use it for everyone.
How to split utilities and shared bills
Rent is rarely the only shared cost. Electricity, gas, water, internet, and streaming usually get split too — and because everyone uses the kitchen, bathroom, and living room, utilities are most often split equally even when the rent is not. The logic is simple: shared spaces are shared equally; private space is what the rent method prices.
- Split equally — the default for internet, water, and trash, which barely vary by person.
- Split by usage — for electricity when one roommate runs a window AC, a gaming rig, or works from home all day.
- Trade off — let the roommate with the master bedroom cover all utilities instead of paying a room-size premium, or buy the shared household supplies.
Handling the master bedroom
The master bedroom is the classic fairness problem: it is bigger, often has a private bathroom, more closet space, and sometimes a balcony. Whoever takes it should pay more — the only question is how much. There are three clean ways to price it.
- Square footage, including the bathroom. Count the en-suite as roughly +100 sq ft and split by room size — the premium falls out of the math automatically.
- A flat premium. Start from an equal split and add a set percentage — commonly 10–25% — to the master, sharing the discount across the other rooms.
- Take the utilities instead. The master pays the same rent as everyone but covers all the utility bills, which often nets out close to a fair premium.
Any of these is defensible — what matters is that everyone agrees before move-in. If two people want the master, a sealed-bid auction (each writes the most they'd pay; the highest bidder takes it and that becomes their rent) is a surprisingly fair tiebreaker.
Put the rent split in a roommate agreement
A rent split is only as good as everyone's memory of it — so don't rely on a spoken deal. Write down the method, each person's dollar share, the due date, how utilities are handled, and what happens if someone moves out early. A short roommate agreement turns a friendly understanding into something all parties have actually committed to.
Splitting rent unequally is perfectly legal — co-tenants can divide the rent however they all agree, and courts will generally enforce a clear written agreement on who pays what. Note one thing the split doesn't change: on most leases all tenants are jointly and severally liable, meaning the landlord can pursue any one of you for the full rent if a roommate doesn't pay. Your internal split decides who owes whom; the lease decides what the landlord can collect.
Should rent be split evenly?
Only when the rooms and the incomes are similar. An equal split is the right default for evenly-matched roommates — it is the simplest and the easiest to agree on. But when bedrooms differ in size, when one has a private bathroom, or when paychecks are far apart, an even split quietly overcharges someone. In those cases splitting by room size or by income is the fairer call, and the reason this calculator offers all three side by side.
Pair this with the rent affordability calculator to check your share fits the 30% rule, the prorated rent calculator for a partial first month, and the budget calculator to fit it all into your month.
Methods and sources
The three methods here are the standard ones used across published rent-splitting guides and tools — an equal split, a square-footage split, and an income-proportional split. The square-footage worked figures ($2,000 ÷ 400 sq ft = $5/sq ft) and the income example (60/40 on a $60k/$40k household) follow the conventions those guides use.
LeaseRunner — How to Split Rent Fairly: 5 Proven Methods.Splitwise — rent-splitting fairness calculator.Frequently asked questions about the free rent split calculator
About this rent split calculator
This rent split calculator runs entirely in your browser. Every figure you enter stays on your device — nothing is sent to a server, logged, or shared. It divides the rent equally, or weights each share by room square footage or income, and the per-roommate amounts always sum back to the full rent, updating instantly as you type.
Calculators Cloud offers 400+ free tools with no sign-up. The whole Finance calculators shelf includes Rent affordability, Prorated rent, and Budget tools alongside this one. Or browse the full calculator directory.