Rent split calculator
Three modes - equal, by room size, by income. Pick the one your flat actually agreed on, see the per-housemate number, and stop having the same conversation every month.
Bills + council tax + broadband, combined. Leave blank if splitting separately.
Weights: 0.7 = box room, 1.0 = standard, 1.3 = master with en-suite. Use any numbers you like.
Each housemate pays per month
- APerson A£666.67
- BPerson B£666.67
- CPerson C£666.67
- Rent
- £1800.00
- Utilities
- £200.00
- Total / month
- £2000.00
- Equal split would be
- £666.67 each
Mid-month move-in or rotating bills?
EvenRound handles pro-rata move-in dates, who paid which bill this month, and the rolling balance. One settle-up per month.
Start a flat groupWhich mode to pick
Equalif the rooms are roughly the same size and incomes aren't wildly different - simplest and rarely contentious. Room sizeif one person genuinely has the master and en-suite, or if there's a box room nobody would choose. Income if the housemates earn meaningfully different amounts and have agreed to share proportionally - more common in couples or family house-shares than in flatmate setups. The point isn't which is fairest in theory - it's which everyone in the flat agrees to before signing.
Common questions
Is income-based rent splitting common in the UK?
In flatmate setups, no - room-size or equal splits are the default. Income-based splits are more common between couples or family members sharing a home where one partner earns substantially more. The honest test: everyone needs to agree to the principle before signing the tenancy, not negotiate it at month three.
What weights should I use for room size?
A pragmatic starting point: box room 0.7, standard double 1.0, large double with en-suite 1.2-1.3, master suite 1.4. The actual numbers matter less than everyone agreeing them up front. Some flats use literal square footage; others just rank rooms and pick weights by feel.
How should we handle utilities that vary month to month?
Two reasonable patterns. Equal monthly direct debits to one person, who then reconciles at the end of the quarter. Or: log each bill in EvenRound as it lands and settle at month-end. The calculator above assumes a steady monthly figure - use the rolling average if you're unsure.
What about someone moving in mid-month?
Pro-rata by days. If they move in on the 16th, they pay roughly half that month's share. This calculator gives the monthly figure; multiply by (days in flat ÷ days in month) for the partial. EvenRound handles this directly with per-expense participants and dates.