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Rent Split Calculator

Split rent fairly among roommates based on room size and amenities. Add bonuses for private bathroom, balcony, windows — share the result in one click.

$ /month

Amenity Bonuses

Bath +10%, Balcony +5%, Windows +3%, Closet +3%, En-suite +8%

Rooms

💰 Rent Split

Total $0

About This Tool

Splitting rent equally when rooms aren't equal? That's not fair. This calculator divides rent based on room size AND amenities — so the person with the master suite pays more than the one in the small room. Enter your total rent, add each room with its square footage, then check off bonuses like private bathroom, balcony, extra windows, or walk-in closet. The calculator weights everything and shows exactly what each person should pay — with percentages and a visual breakdown. When you're done, copy the result as shareable text to drop in your roommate group chat. No more awkward negotiations — just math.

How to Use

1. Enter your total monthly rent 2. Add rooms (one per roommate) with name and square footage 3. Check amenity bonuses for each room: private bathroom, balcony, extra windows, closet 4. Adjust bonus percentages if needed (defaults: bath +10%, balcony +5%, etc.) 5. View each roommate's share, percentage, and visual bar 6. Click "Copy as Text" to share the breakdown with roommates

Formula

Weighted area = Room size × (1 + sum of bonus percentages) Example: 150 sq ft room with private bath (+10%) and balcony (+5%) Weighted area = 150 × 1.15 = 172.5 Share = (Weighted area ÷ Total weighted area) × Total rent Default bonuses: Private bathroom: +10% Balcony/patio: +5% Extra windows/natural light: +3% Walk-in closet: +3% En-suite/attached bath: +8%

Frequently Asked Questions

How do you split rent fairly between roommates?
The fairest method is proportional to room size plus amenities. Measure each room's square footage, add percentage bonuses for features like private bathrooms or balconies, then divide the total rent by the weighted total. This calculator does all the math automatically.
Should the person with the bigger room pay more rent?
Yes, in most fair arrangements. If one room is 50% larger, that person should pay proportionally more. The exact split depends on how much you value square footage vs shared spaces. This calculator focuses on private room differences since common areas are shared equally.
How much extra should a private bathroom add to rent?
A private bathroom typically adds 8-12% to a room's value. This calculator defaults to 10%. You can adjust this — some roommates value privacy higher (15%) while others care less (5%). Discuss and agree on the percentage before calculating.
What if all rooms are the same size but one has a balcony?
Use the bonus system. If rooms are equal (say, 120 sq ft each) but one has a balcony worth 5%, that room's weighted value becomes 126 sq ft equivalent. The person with the balcony pays slightly more — proportional to how much the group values that amenity.
How do you split rent in a 3-bedroom apartment?
Measure each bedroom's square footage. Add bonuses for any room features (private bath, balcony, etc.). Enter all three into this calculator and it will compute each person's fair share based on their room's weighted value relative to the total.
Should common areas affect rent split?
Usually no — common areas (kitchen, living room, hallways) are shared equally, so they don't change the split. This calculator focuses on private bedroom differences. If one roommate has exclusive use of a den or garage, you could add that as a separate 'room' with its own bonus.
What if my roommate disagrees with the calculated split?
The calculation is only as fair as the inputs everyone agrees on. Discuss the bonus percentages first — maybe your group values a private bathroom at 15% instead of 10%, or doesn't care about window count. Adjust the weights until everyone feels the split is fair, then use that result.

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