Rent Split Calculator
Enter the monthly rent, utilities, and both incomes to see what a fair split looks like — equal halves versus proportional to what each person earns.
Total for the whole place.
Electricity, internet, water — the predictable stuff.
Pre-tax is fine — only the ratio matters.
Their pre-tax yearly income.
Your share if split by income
$1,040
- Monthly pool (rent + utilities)
- $2,600
- Your share if split evenly
- $1,300
- Roommate pays (income-based)
- $1,560
- You save vs even split
- $260
How it works
Everything you both owe — rent plus monthly utilities — is pooled into one number, then split two ways. The even split is simply half each. The income-based split divides the pool in proportion to what each person earns, so someone making $60k against a partner making $90k covers 40% of the total instead of 50%. Neither model is “correct” — even splits feel fairest when incomes are similar or the smaller room is nicer; income-proportional splits keep housing affordable relative to each paycheck. The calculator shows both so you can argue about philosophy with numbers on the table instead of vibes.
Frequently asked questions
Is splitting rent by income actually fair?
It depends what “fair” means to you. Income-proportional splits cost each person the same share of their take-home pay, which keeps the apartment equally affordable for both. Even splits are simpler and feel fair when incomes are close. Couples with large income gaps usually land on proportional; roommates who want zero money talk prefer even.
What happens when one of us gets a raise?
Re-run this calculator — that is the point of agreeing on a method up front. Proportional splits adjust automatically with the new numbers; even splits never change. Write whichever rule you choose into the roommate agreement before move-in.
How do I factor in rooms of different sizes?
Treat the better room as a premium: agree on an adjustment amount ($100–$300/month is typical), add it to that person’s share, and subtract it from the other. This calculator splits the base fairly — apply the room premium on top of whatever model you pick.
What about deposits and move-out math?
Split the security deposit the same way you split rent — proportionally if that is your model — and put it in writing. At move-out, deductions should come out of each person’s deposit in the same ratio unless damage is clearly attributable to one party.