Check a shared monthly budget by utility
A household splits its sample combined allowance into 110 for electricity and 45 for water. It wants to see whether underspending on one can offset an overrun on the other.
Open TrackerInputs and calculation
| Month | Utility | Usage | Bill | Budget | Variance | Month change |
|---|---|---|---|---|---|---|
| 2025-04 | electricity | 420 kWh | 105 | 110 | -5 | — |
| 2025-04 | water | 14 m³ | 49 | 45 | 4 | — |
| 2025-05 | electricity | 480 kWh | 120 | 110 | 10 | 15 (14.2857%) |
| 2025-05 | water | 10 m³ | 35 | 45 | -10 | -14 (-28.5714%) |
April total is 105 + 49 = 154 against 155. May totals 120 + 35 = 155. May variances of +10 and −10 cancel.
What the comparison shows
May meets the combined budget even though the electricity row is over. If the budget categories are kept separate, the electricity overrun is still relevant.
Assumptions and limits
Record both budgets separately. Combine the variance by hand for bills in the same currency.