Household Bill Split
Calculator

An even split divides the total bill equally regardless of income or usage, while a proportional split allocates shares based on a factor like income, room size, or usage percentage that you supply. Roommates with very different incomes often prefer proportional splitting for fairness.

Prorate that person's share by the fraction of the billing period they actually lived there, then redistribute the remainder among the full-period residents; entering the exact number of days each person was present gives the most accurate split.

For usage-heavy shared costs like a streaming plan with unequal viewing or a utility with unequal use, weight the split by an agreed usage estimate rather than dividing evenly, since an even split systematically overcharges light users.

You should separate personal-only costs (like someone's individual phone line) from the shared total before splitting, since folding personal charges into the shared pool means everyone else subsidizes that person's private usage.

When a total doesn't divide evenly among roommates, the calculator rounds each share to the nearest cent, which can leave a penny or two unallocated; the common practice is to assign that remainder to whoever pays the bill directly.