Compare usage and effective price across bills
A household’s simulated electricity usage declines while its statement amount rises. It records both columns to check why a spending trend can move in the opposite direction from meter use.
Open TrackerInputs and calculation
| Month | Utility | Usage | Bill | Budget | Variance | Month change |
|---|---|---|---|---|---|---|
| 2025-05 | electricity | 400 kWh | 100 | 110 | -10 | — |
| 2025-06 | electricity | 360 kWh | 108 | 110 | -2 | 8 (8%) |
Usage changes by −40 kWh, or −10%. The effective price moves from 100 ÷ 400 = 0.25 to 108 ÷ 360 = 0.30 per kWh.
What the comparison shows
The household used less while paying 8 more. The tracker documents both observations. The Bill Detective can use the supplier’s itemized rates to separate effects.
Assumptions and limits
Amount divided by usage is an effective price and can include fees. Check itemized bills before interpreting it as a tariff.