Fictional worked example

Compare bills with different billing days

A renter sees a higher bill even though their meter averages 9 kWh per day in both periods. The four extra days need to be accounted for before comparing household habits.

Open Calculator

Inputs and calculation

28-day period
Tool inputValue
CurrencyUSD
UtilityElectricity (kWh)
Metered usage252
Tariff typeFlat rate
Price per billing unit (USD)0.23
Service fee (USD)11
Tax on usage plus service fee (%)0

28 × 9 = 252 kWh. 252 × 0.23 + 11 = 68.96.

Tool result · USD 68.96

32-day period
Tool inputValue
CurrencyUSD
UtilityElectricity (kWh)
Metered usage288
Tariff typeFlat rate
Price per billing unit (USD)0.23
Service fee (USD)11
Tax on usage plus service fee (%)0

32 × 9 = 288 kWh. 288 × 0.23 + 11 = 77.24.

Tool result · USD 77.24

What the comparison shows

The 8.28 increase comes from 36 more billed kWh. Daily usage is unchanged in the example.

Assumptions and limits

The demo uses one fee per statement. A daily or prorated fee needs to be calculated for each period first.

Related guides and examples