Roommate Rent Split Calculator
Use this roommate rent split calculator to divide rent and shared bills fairly, whether everyone is splitting evenly or one room clearly deserves a premium.
Set up the apartment split
Shares by roommate
How this calculator helps
Equal split is simple, but it is not always fair when bedroom sizes, private bathrooms, parking, or furnished spaces differ.
This calculator lets you split the rent pool in several ways and then layer in assigned add-ons like parking or bathroom premiums.
It helps roommates have a more transparent conversation before move-in instead of renegotiating after the lease is signed.
How the math works
Equal split = total rent ÷ roommate count.
Weighted split = total rent × each roommate’s weight ÷ all roommate weights combined.
Custom percentage split = total rent × each roommate’s entered percentage, with add-ons assigned separately.
Worked examples
Equal two-way split
Two roommates share a similar two-bedroom apartment.
- • Rent: $2,200
- • Utilities and internet: $240
- • Two roommates
Each roommate pays half the rent plus half the shared bills.
Master bedroom premium
One roommate gets the larger bedroom and private bathroom.
- • Rent: $3,000
- • Three roommates
- • Master room given higher weight
The master-bedroom renter takes a larger share while the smaller rooms cost less.
Parking assigned to one roommate
One person uses the building’s reserved parking spot.
- • Parking: $175
- • Only one roommate assigned parking
The parking cost stays with the person who uses it instead of being shared by everyone.
Frequently asked questions
Related tools
See whether your personal share fits your income.
Estimate the shared utility pool before splitting it.
Measure the full cost of parking over time.
Compare furniture tradeoffs for a shared apartment.
Important note
There is no universal legal formula for roommate splits. Use this tool to structure a fair discussion, then document the final agreement clearly.