Home & Household
Split a shared bill evenly, or proportionally by room size or another weight you agree on.
Last updated: August 2026
| Roommate | Weight (e.g. room size) | Share | |
|---|---|---|---|
| Total | 0 | $0.00 |
With "Split evenly," everyone pays the same share regardless of weight. With "By room / weight," each person's share is proportional to the number you give them — use room square footage, number of occupants, or anything else you've agreed on.
Common questions about splitting shared bills fairly with roommates.
There's no single universally 'correct' method — an even split is simplest and works well when rooms and usage are similar, while a weighted split (by room size, number of occupants, or private bathroom access) can feel fairer when the apartment has meaningfully different-sized rooms. The best approach is whatever the household agrees to upfront, ideally in writing, before disputes come up.
Most households split internet evenly regardless of room size or usage, since it's a shared resource everyone benefits from equally, unlike electricity or gas which can vary by individual habits. Many people using this calculator apply the even split specifically to internet and streaming, while using a weighted split for electricity or rent.
A common approach is prorating that person's share by the number of days they lived there that billing cycle, then re-splitting the remainder among the remaining roommates going forward. This calculator handles a single month at a time, so you'd manually adjust the weight or total for a partial month.
If usage is meaningfully unequal — for example, one room running a space heater or window AC unit constantly — many households either add a separate flat surcharge for that person, or in more extreme cases, install a plug-in energy monitor to sub-meter that specific device. Otherwise, weighting by room size is usually close enough to fair without needing that level of tracking.
If your split method and roommate weights don't change much month to month, some households set up a recurring shared spreadsheet or a bill-splitting app that automatically deducts from each person's account. This calculator works well for a quick one-off calculation or for agreeing on the split method itself before automating it elsewhere.
