Read a three-month electricity trend
A renter enters three simulated electricity statements after moving. The goal is to see how much of a February rise remains in March.
Open TrackerInputs and calculation
| Month | Utility | Usage | Bill | Budget | Variance | Month change |
|---|---|---|---|---|---|---|
| 2025-01 | electricity | 260 kWh | 65 | 75 | -10 | — |
| 2025-02 | electricity | 340 kWh | 85 | 75 | 10 | 20 (30.7692%) |
| 2025-03 | electricity | 300 kWh | 75 | 75 | 0 | -10 (-11.7647%) |
February change = 85 − 65 = 20. March change = 75 − 85 = −10. March is still 75 − 65 = 10 above January.
What the comparison shows
The March decline erased half of the February increase. A month-over-month decrease can coexist with a higher three-month endpoint.
Assumptions and limits
Use consecutive billing months and identical units and currency. Bill length can differ even when month labels are consecutive.