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Utility bill split calculator

Split a power, gas, water, or internet bill with your housemates. It counts the days each person was there, so a move in partway through is still fair. Free, instant, and no sign up.

One share each, counted by the days each person was here.

Dates this bill covers

Who owes what

Enter the bill total to see each share.

Your bill is split.

Things can change though. We are always releasing new tools and articles about sharing a home. Want us to send them your way?

How to use this calculator

  1. Type the total from the bill.
  2. Pick how your home wants to split it. "Split evenly" gives one share each. "By usage" lets you say who used more. "Charge plus usage" shares the fixed fee and splits the rest by usage.
  3. Put in the dates the bill covers. They are printed on it. If nobody moved, you can skip this part.
  4. Add a row for each housemate. Turn off "here the whole time" for anyone who moved in or out, and give their dates.
  5. The shares update as you type. Send them to your home when they look right.

How this is calculated

The whole thing runs on days. We add up the days each person was in the home during the period the bill covers. That gives a total we call person days. Each person pays the share of the bill that matches their slice of those person days. This is the part other tools get wrong, and it is easy to check: the shares always add up to the bill.

A worked example. The bill is $120 and covers 30 days. One person was there all 30 days. Two others were there 20 days each. That is 70 person days in total. The first person pays 30 of 70, so $51.43. The other two pay 20 of 70, so $34.29 and $34.28. Add them up and you get $120.00. The formula you will find on most other sites divides $120 by 30 and multiplies by each person's days. That gives $120, $80, and $80, which is $280 on a $120 bill.

"By usage" keeps the same day math and adds your own weights on top. If you say one person used twice as much, their days count twice. These weights come from you, not from us. Nobody meters a bedroom, so a made up number would just be a guess dressed up as research.

"Charge plus usage" splits the bill in two parts. The fixed service fee is what you pay for having the service at all, so it follows days only. Everyone gets the same benefit from the meter being on. The rest of the bill is what you pay for using it, so it follows usage. It is the same idea as the shared space split in our rent tool.

One thing we do not do: guess your numbers. The tool never fills in a typical bill or a typical fee for you. You read those off your own bill. A guessed average would be wrong most months of the year, because power and gas bills swing hard with the seasons.

Sources: US Energy Information Administration, average monthly bill by state (Form EIA-861, 2024) and the 2020 Residential Energy Consumption Survey monthly tables. Fixed fee ranges come from utility guides and vary by provider.

Why the season matters more than you think

US government survey data tracks what a home spends on power and gas each month. Power costs the most in July, at about 1.7 times the April low. Gas costs the most in January, at about 4 times the July low. Put them together and a home's energy cost swings about 1.6 times across the year.

Some places are far sharper. In the hot part of the Mountain states, an August power bill runs about 2.4 times a February one. In New England, a January gas bill runs about 5.6 times an August one. So "we all pay $60 a month" is fine in spring and unfair by August. Split the bill you got, when you get it.

Common questions

How do you split a bill when someone moved in halfway through?
Count days, not people. Add up the days each person was there. That total is what you divide the bill by. Someone who was there 20 days out of a 60 day person total pays a third. Watch out for the version you see on other sites, which divides the bill by the days in the month and then multiplies by each person. That one adds up to way more than the bill.
Do the shares always add up to the bill?
Yes, to the cent. We work in whole cents and hand any leftover penny to the biggest share. So the numbers you send your home will always match the bill you got. If a split tool ever gives you shares that add up to more than the bill, stop using it.
What dates do I put in? The month, or something else?
Use the dates printed on the bill, not the month. A power bill covers a meter reading period, and it often runs from the middle of one month to the middle of the next. Most run 28 to 33 days. Splitting by the calendar month when the bill covers June 12 to July 13 gives everyone the wrong answer.
One of us uses way more. Can we take that into account?
Yes. Pick "By usage" and say who used more and roughly how much more. Nobody has a meter on each room, so these are your own numbers, not ours. That is the honest way to do it. Talk it through first and pick a number your whole home agrees on.
What is the fixed charge on my bill?
Most power, gas, and water bills have a set fee you pay even at zero usage. It pays for the meter and the line. It runs from about $5 to $25 a month, and it depends on your utility. Pick "Charge plus usage" and type it in. Everyone shares that fee the same, because everyone gets the same benefit from having the lights on.
Can we just split the same amount every month instead?
You can, but the real bill moves a lot. In a normal US home the power bill peaks in July at close to 1.7 times its April low. Gas is wilder. It peaks in January at about 4 times its July low. A flat number means someone quietly pays too much for half the year. Splitting the bill you actually got is simpler and fairer.
What is a normal power bill?
The average US home paid about $142 a month for power in 2024, on about 863 kilowatt hours. Where you live changes it a lot. New Mexico averaged about $93 and Hawaii about $212. Two very different things make a bill big: a high price per unit, or a lot of use. Those are US government figures.
Who should have the account in their name?
Someone has to, and that person carries the risk if the home pays late. Agree up front on the due date, who sends the total around, and by when. Write it down. The person with their name on it should never have to ask twice.

Doing this every month is the hard part

Working out one bill takes a minute. Doing it twelve times a year, for every bill, while everyone gets on with their lives, is the part that wears people down. Homera runs that part for your whole home. Your home agrees on the split once. Then everyone pays their share before the bill is due, and the app sends the reminders.

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Last updated 2026-07-26.