Rent Split Calculator

Split rent fairly among roommates based on room size and square footage.

Results

Visualization

How It Works

The rent split calculator divides rent fairly based on bedroom square footage, so the person with the larger room pays proportionally more.

The Formula

Room Share = (Room Sqft / Total Sqft) * Total Rent

Variables

  • Room Sqft — Square footage of each bedroom
  • Total Sqft — Combined sqft of all bedrooms
  • Share — Each room's proportional rent

Worked Example

$3,000 rent. Room 1=150sqft, Room 2=120sqft, Room 3=100sqft. Total=370sqft. Room 1=(150/370)*$3,000=$1,216. Room 2=$973. Room 3=$811.

Practical Tips

  • Include closet space and private bathroom access for fairness.
  • Consider hybrid: split part equally (shared spaces) and part by size.
  • Factor in amenities like natural light or en-suite bath.
  • Put the agreement in writing.
  • Use Splitwise or Venmo for shared expenses.

Frequently Asked Questions

Is splitting by room size fair?

It's widely considered the fairest method when bedrooms differ significantly in size.

What about shared spaces?

Common approach: 60-70% by room size, 30-40% equally for shared spaces.

Should the master bedroom cost more?

Yes, especially with private bath. A master suite may be worth 20-40% more beyond sqft difference.

How do I measure my room?

Measure length x width in feet. Include alcoves and closets inside the room.

What if roommates can't agree?

Try sealed-bid: each writes max they'd pay per room. Assign rooms to highest bidders.

Last updated: March 20, 2026 · Reviewed by the RentCalcs Editorial Team