Review an electricity bill that exceeded budget
A household compares two simulated statements. It wants to distinguish the amount over budget from the amount above last month.
Open TrackerInputs and calculation
| Month | Utility | Usage | Bill | Budget | Variance | Month change |
|---|---|---|---|---|---|---|
| 2025-10 | electricity | 510 kWh | 132 | 140 | -8 | — |
| 2025-11 | electricity | 560 kWh | 150 | 140 | 10 | 18 (13.6364%) |
November variance = 150 − 140 = 10 over. The month change is 150 − 132 = 18, or 18 ÷ 132 × 100 ≈ 13.64%.
What the comparison shows
October was 8 under the same budget. November’s increase in spending is 18 even though the budget overrun is only 10.
Assumptions and limits
Enter each month once. A change in amount alone cannot identify a change in price or use.