Electricity Bill Split Calculator
Split one electricity bill fairly between floors, portions or tenants using their sub-meter readings, with shared units like the water pump split equally.
A name and the units each sub-meter used. Units the sub-meters don't cover (shared lights, water pump) are split equally.
Ground floor
Rs 22,800
- First floor
- Rs 19,200
Ground floor pays Rs 22,800, First floor pays Rs 19,200.
How it's worked out
- Price per unit
Rs 42,000 ÷ 700 unitsRs 60 - Shared units
700 − 580 on sub-meters, split 2 ways60 units each
Split
| Meter | Own units | Shared units | Pays |
|---|---|---|---|
| Ground floor | 320 | 60 | Rs 22,800 |
| First floor | 260 | 60 | Rs 19,200 |
- Uses one average price per unit. With slab tariffs, the bill's real cost per unit rises with total use, so this shares that cost fairly in proportion.
How it works
Price per unit = bill ÷ units · Each pays = (own units + shared units ÷ portions) × price per unit
Worked example
A Rs 42,000 bill for 700 units is Rs 60 a unit. The ground floor's sub-meter shows 320 units and the first floor's 260, leaving 120 shared units, 60 each. The ground floor pays 380 × 60 = Rs 22,800 and the first floor 320 × 60 = Rs 19,200.
Questions people ask
How do I split an electricity bill with sub-meters?
Divide the bill by its total units to get the price per unit. Each portion pays for its own sub-meter units, and the units the sub-meters don't cover are split equally.
Why not just split by sub-meter units?
The sub-meters usually add up to less than the main meter, because of shared lights, the water pump and line losses. Those shared units have to be split somehow, and equally is fairest.
Does this work with slab tariffs?
It uses the bill's average price per unit, which shares the higher slab rates fairly in proportion to use.
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem