How to use this calculator
- Enter the total amount of the main bill and the total units shown on it.
- Type each room's sub-meter reading for the month. Leave unused rooms at zero.
- Check the rate per unit and the common area units.
- Read the table to see what each room owes, including its share of the common area.
- Share the result and keep a photo of the meter readings.
Splitting a shared bill without arguments
Shared meters are common in boarding houses, apartments and shared homes in the Philippines. Without a clear method, bills turn into arguments about who ran the aircon or the water pump.
This calculator uses the sub-meter reading of each room, charges the rate from the main bill and divides the common area cost fairly. The table is easy to screenshot and share in the group chat.
To estimate what a single appliance costs, use the aircon cost calculator or the electricity bill calculator, and see our rent saving tips.
How the bill split works
- The rate per unit is the main bill divided by the total units on it.
- Each room pays its own units times that rate.
- Units that are not on any sub-meter, such as hallway lights, a water pump and line loss, form the common area.
- The common area cost is shared equally between the rooms that used units.
Tips to save more
- Take dated photos of every meter reading.
- Agree on the method and any service fee in writing.
- Check the sub-meters now and then for errors.
- Encourage lower use with a clear, monthly report.
Frequently asked questions
How do I split an electricity bill between rooms?
Divide the total bill by the total units to get a rate, then multiply each room's sub-meter units by that rate. Share any leftover units equally.
Is it fair to charge the same rate as the utility?
Charging the average rate from the main bill keeps the split transparent. Some landlords add a small service fee, so agree on it in writing.
What is the common area?
It is the power or water used by shared spaces and the losses between meters. It equals the main units minus the sub-meter total.
Can I use this for water?
Yes. Enter the water bill and the cubic meters from the main and sub-meters.
How should we agree on the method?
Write down the method, take a photo of every meter reading each month and share the result with everyone.
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This calculator gives estimates for planning only. It is not financial, tax or legal advice. Confirm exact figures with your employer, bank, lender or the relevant government agency.