About the Roommate Rent Split Calculator
Split rent by bedroom size with shared common areas divided equally — fair when rooms differ in size.
Also known as: split rent by room size, bedroom size rent split, roommate rent.
How to use this calculator
- Enter total rent, bedroom sizes (sq ft or m²), share of rent for common areas.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Pays = common ÷ people + private × room ÷ total room area
Worked example
Using the values pre-filled in the calculator above:
- Total rent = 3,000
- Bedroom sizes (sq ft or m²): 180, 140, 120
- Share of rent for common areas = 40 %
the calculator returns:
- Largest room pays: 1,136.36