How is common area electricity calculated?

Common area electricity is calculated as the difference between your total bill units and the sum of all submeter readings. This common unit amount is then distributed among all roommates proportionally based on the number of days each person stayed. For example, if someone stayed for 15 days while others stayed for 30, they pay half the share of common costs.

How do you calculate electricity bill per person?

Electricity bill per person is calculated by: 1) Finding each person's consumed units from their submeter (current - previous reading), 2) Calculating their share of common units based on days stayed, 3) Converting total units to amount using the bill's unit rate, 4) Allocating common area costs proportionally. The final amount = (person's units × rate) + (person's common share × common rate).

What if a roommate was absent for some days?

SplitWatt handles partial occupancy perfectly. When adding roommates, simply enter the number of days each person actually stayed in the flat. The calculator automatically adjusts their share of common area costs proportionally. For example, someone staying 15 days pays half the common costs of someone staying 30 days, but pays full for their personal room consumption.

What is the formula for splitting electricity bills?

The electricity bill split formula is: For each person: Personal Units = (Current Reading - Previous Reading) for their area. Total Units in Area = Sum of all personal units in that area. Common Units = Total Bill Units - Sum of all submeter units. Person's Common Share = Common Units × (Days Stayed / Total Days in Period × People in Area). Final Amount = (Personal Units × Unit Rate) + (Person's Common Share × Common Unit Rate).

How do I handle electricity bill split for paying guests?

For paying guests (PG), use the same submeter-based approach. Track each room's consumption separately via submeters. Common areas like corridor, kitchen, and living room usage is distributed among all occupants based on days stayed. PG operators can use SplitWatt to generate individual bills for each room/bed instantly.

Split electricity bills fairly among roommates

Use submeter readings to calculate each roommate's share accurately. Handle common area costs, track billing history, and export results in seconds.

Everything you need to split bills

No more spreadsheets or arguments. SplitWatt handles the math so you can focus on living.

Submeter Tracking

Enter readings for each area (hall, room) and let the system calculate individual consumption automatically.

Common Area Split

Common units (difference between bill and submeters) are distributed proportionally based on days stayed.

Day-Based Sharing

Going on vacation? Each person's share adjusts based on the number of days they actually stayed.

PDF & Image Export

Download a clean PDF or image of the bill breakdown. Share it with roommates via WhatsApp in one tap.

Auto Reading Shift

Previous readings auto-fill from your last bill. No more flipping through old photos to find meter numbers.

Bill History

All your bills saved in one place. Track spending trends and look up past calculations anytime.

How it works

Three simple steps to fair electricity bills.

Add roommates

Set up your flat and add roommates to their respective areas.

Enter bill details

Input the total bill, units, and submeter readings. See the split live.

Share results

Export as PDF, download as image, or share directly on WhatsApp.

Ready to split bills the fair way?

Free forever for personal use. No credit card required.

Frequently Asked Questions

Everything you need to know about splitting electricity bills fairly.

To split electricity bills fairly with roommates: 1. Enter your total bill amount and units from your electricity bill 2. Add submeter readings for each area (hall, rooms) 3. Add roommates with their days stayed in each area 4. The calculator automatically distributes common units proportionally You can then export the results as PDF or share via WhatsApp.

Common area electricity is the difference between your total bill units and the sum of all submeter readings. This common amount is distributed among all roommates proportionally based on days stayed. Example: If someone stayed 15 days while others stayed 30, they pay half the share of common costs.

Submeter readings are measurements from individual electricity meters installed in different areas of your flat — like the hall, hallway, and individual rooms. These meters track exactly how much electricity each area consumes. By comparing current and previous readings, you calculate the exact units used by each area for fair bill splitting.

Electricity bill per person is calculated as: 1. Find each person's consumed units from their submeter (current - previous reading) 2. Calculate their share of common units based on days stayed 3. Convert total units to amount using the bill's unit rate 4. Allocate common area costs proportionally Final Amount = (Person's Units × Rate) + (Person's Common Share × Common Rate)

Yes, SplitWatt is completely free for personal bill splitting. • Create an account to save your flats and bill history • Or use guest mode without signing up • Export bills as PDF or images • Share with roommates on WhatsApp All features are free — no credit card required.

SplitWatt handles partial occupancy perfectly. Simply enter the number of days each person actually stayed in the flat. Their share of common area costs adjusts automatically. Example: Someone staying 15 days pays half the common costs of someone staying 30 days, but pays full for their personal room consumption.