Shared Expenses and Equal Money Split Calculator
Settle shared expenses after accounting for what each person already paid.
Property
Weighted Rent Split Calculator
Enter the total rent and weights agreed for each person, couple or room to calculate their shares. The weights express your agreement about space and occupancy; the tool does not decide what is fair.
Your numbers
How the calculation works
Split a monthly rent total using weights agreed by the people sharing it. Equal weights produce equal shares before rounding; different weights express a different agreement about rooms, occupancy or shared costs. The calculator assigns every cent, but it does not decide which agreement is fair or legally required.
Unrounded share = total rent × individual weight / total weights. Allocate whole cents with the largest-remainder method so every cent is assigned exactly once.
Set relative weights
Weights express proportions rather than currency amounts. Multiplying every weight by the same positive factor leaves the shares unchanged. A zero weight gives that participant no share of the entered rent.
Calculate proportional shares
Each weight is divided by the total weight, and that fraction is applied to the rent. The unrounded results may include fractions of a cent even when the original rent has only two decimal places.
Allocate the remaining cents
The calculator first rounds each share downward to whole cents. It then gives remaining cents to the largest fractional remainders; equal remainders are resolved in the order the participants were entered.
Worked example: Three equal shares with one spare cent
Sample inputs demonstrate the method. They are not a forecast or product offer.
The example splits €100 between A, B and C with equal weights. Each unrounded share is one third of the total. After allocating €33.33 each, one cent remains; the tie follows input order, so A pays €33.34 and B and C pay €33.33.
- Total monthly rent
- 100
- Occupants and agreed weights
- A,1 B,1 C,1
Expected result
- Total rent allocated
- €100.00
- Participants
- 3
Worked example: Zero weight pays nothing
Sample inputs demonstrate the method. They are not a forecast or product offer.
- Total monthly rent
- 90
- Occupants and agreed weights
- A,0 B,1 C,2
Expected result
- Total rent allocated
- €90.00
- Participants
- 3
Understanding your result
Read the table for each participant’s monthly amount. The allocated total should equal the entered rent exactly, so the group does not need to collect an extra cent or leave a cent unpaid because of independent rounding.
The displayed weights document the chosen split rather than validate it. Room size, exclusive facilities, time spent in the property and joint liability need agreement outside this arithmetic.
Questions you might have
Must a couple always pay twice as much?
No. You choose the weights. Two equal person weights and a single shared-room weight represent different agreements.
Choosing the right inputs
- Total monthly rent
- Enter the total monthly amount to allocate with no more than two decimal places. Include only costs that everyone has agreed to divide using these same weights; separately allocated bills should not be silently added.
- Occupants and agreed weights
- Use a distinct name and a non-negative weight on each row. At least one weight must be positive. A couple can be entered as two people or as one household with an agreed weight; those choices represent different arrangements.
Common mistakes to avoid
- Do not assume that a couple must always receive twice the weight of another household.
- When identical remainders occur, changing row order can change who receives an extra cent.
Assumptions to check
- Weights encode your agreement about private space, shared space and occupancy; the calculator does not decide fairness.
Sources and method
Read our calculation and testing approach.