Rent Split Calculator
Splitting rent between roommates by the space each one uses.
Recent
Formula
How the calculation works
Splitting rent equally is easy and often unfair, because rooms are not equal. Charging by floor area fixes that: your share is your room as a fraction of the whole area, applied to the rent. On 30,000 with a room of 250 out of 1,000, your share is 7,500, or 25%.
The rule also makes the cost of a bigger room visible. Moving from a 250 to a 350 room in the same flat raises your share from 25% to 35%, which is exactly the trade anyone choosing between rooms needs to see.
Common mistakes
- Splitting equally when the rooms are not. It quietly overcharges the person in the smaller room.
- Using the whole flat's area including shared space for one person's share. Use each bedroom's own area, and the total should be the sum of the rooms.
When to use it
- Use it when roommates are deciding how to split rent fairly, especially when the rooms differ in size.
- It splits by area only. A flat with a private bathroom or a balcony can justify a different rule, which this tool does not model.
Worked example
Rent of 30,000 with your room at 250 of 1,000: your share is 7,500, or 25%.
Common questions
Why not just split equally?
Equal rooms make equal shares fair. But when one room is much larger, splitting by area is fairer.
Which area do I use?
Use the bedroom sizes, since the rooms are the real difference. Add all the rooms for the total.
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