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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.
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.
Rooms with private bath get a 20% weight premium. Split is proportional to weighted sq ft.
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%
FinCalc AI
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.
FinCalc AI
Suggested questions:
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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.
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.
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.
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.
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