Roommate Rent Split Calculator
Split rent fairly by room size and private bath. Larger rooms and rooms with private bathrooms pay more. Add rooms, enter square footage, and get an instant fair division.
Example: $2,400 rent, 3 rooms (120 sqft + bath, 100 sqft, 80 sqft)
Room 1
$1,066.67
Room 2
$740.74
Room 3
$592.59
Total
$2,400
At $2,400/month with a 120 sqft master (private bath), 100 sqft and 80 sqft bedrooms, the split is roughly $1,066.67, $740.74, $592.59.
Source: FinCalc server-rendered example using the same formulas as the interactive calculator.
Inputs
Rooms
Rooms with private bath get a 20% weight premium. Split is proportional to weighted sq ft.
Rent split
Total: $2,400/month. Each roommate pays:
Room 1 (120 sqft, private bath)
$1,066.67
44.4%
Room 2 (100 sqft)
$740.74
30.9%
Room 3 (80 sqft)
$592.59
24.7%
AI explains your result
FinCalc AI
How it works
Each room gets a weight = sq ft × 1.2 if it has a private bath, else × 1. Your share = (your weight ÷ total weight) × rent. Larger rooms and private baths pay more; smaller rooms pay less. This is a common fair-split method used by roommates and coliving spaces.
Ask about this calculator
FinCalc AI
Suggested questions:
Embed this calculator
Copy and paste this HTML snippet to embed the Rent Split Calculator on your site.
Frequently asked questions
How do you split rent fairly between roommates?
A common fair method: split by room size (square footage). Larger rooms pay more. Add a premium (e.g., 20%) for rooms with private bathrooms. Formula: each person's share = (their room weight ÷ total weight) × rent. Our calculator does this automatically.
Should the master bedroom pay more rent?
Yes, in most fair splits. The master is usually larger and often has a private bath. Splitting by sq ft and bathroom access reflects that. For a $2,400 apartment with 120 sq ft master (private bath) and two 80 sq ft rooms, the master might pay ~$1,000 and the others ~$700 each.
How much more should a room with private bathroom pay?
A 15–25% premium is common. We use 20%: a 100 sq ft room with private bath gets weight 120 (100 × 1.2). Adjust based on what roommates agree on. The key is transparency—everyone sees the formula.
What if we have different income levels?
This calculator splits by room size and amenities, not income. If income differs, roommates can swap rooms (smaller room = less rent) or one person takes the master and pays more. The split stays proportional to what you get.
What's Next?
Advertisement
What to calculate next
View all calculators →Mortgage Early Payoff
Calculate how extra payments reduce your mortgage term and total interest paid. Supports annuity and differentiated payment schedules.
Rent vs Buy
Should you rent or buy? Compare total costs including mortgage, taxes, appreciation, and opportunity cost over time.
House Affordability Calculator
Estimate max home price using debt ratios, down payment, mortgage rate, and state-specific property tax assumptions.
HOA Cost Calculator
Total HOA cost over 10–30 years with growth and special assessments. See what condo dues really cost.
Rent Budget Calculator
How much rent can you afford? 30% rule: max rent = 30% of gross income. 25% conservative, 35% stretch.
Down Payment Savings Calculator
How long to save for a home down payment? Target, current savings, monthly contribution, expected return. Year-by-year projection.