Shared Household Calculators
Split bills by income.
Enter each person's take-home pay and the shared bills. Choose a split in proportion to income, or one where everyone has the same money left. Use the same pay period for everyone. Runs in your browser; nothing is sent or stored.
Incomes and shared bills
Result
Fill the form and press Calculate.
Worked example
Alex takes home 4,200.00 and Sam 2,800.00 a month, so Alex earns 60% of the 7,000.00 combined. Shared bills are rent 2,000.00, utilities 180.00, internet 70.00 and groceries 750.00, 3,000.00 in all. Split by income, Alex pays 1,800.00 and Sam 1,200.00. If you instead want equal money left over, 4,000.00 remains after bills, 2,000.00 each, so Alex pays 2,200.00 and Sam 800.00.
How it works
By income: each pays bills x their pay / combined pay. Equal money left: each pays pay - (combined pay - bills) / people. The first keeps the share of pay the same for everyone; the second makes each person's leftover identical, which asks the higher earner for more. If equal leftover would ask someone to pay a negative amount, the tool tells you to use the proportional split. Use take-home (net) pay and the same period, such as one month, for incomes and bills.
Sources and basis (checked 2026-10-08): arithmetic on the numbers you enter, with no external constants or published figures. Amounts are in whatever currency you enter. This is a calculation aid, not legal, tax or financial advice.
FAQ
How do I split household bills by income?
Divide each person take-home pay by the combined take-home pay to get their share, then multiply the total bills by that share. This tool does it and rounds to the cent so the shares add up.
Should I use gross or net pay?
Most couples use take-home pay because that is the money actually available, but the choice is yours. Use the same kind of pay for everyone.
What is the difference between the two methods?
Splitting by income makes everyone pay the same percentage of their pay. Equal money left makes everyone end with the same amount after bills, so the higher earner pays more than their income share.
Does it work for roommates as well as couples?
Yes, for up to four people. For rent that also depends on room size, use the roommate rent split calculator.
What period should I use?
Any, as long as it is the same for incomes and bills. Monthly figures are the usual choice.