Combine water and sewer unit charges
A townhouse bill applies two unit rates to the same metered 12 m³. The residents want one estimate for the combined water and sewer lines.
Open CalculatorInputs and calculation
| Tool input | Value |
|---|---|
| Currency | USD |
| Utility | Water |
| Volume or billing unit | m³ |
| Metered usage | 12 |
| Tariff type | Flat rate |
| Price per billing unit (USD) | 4.6 |
| Service fee (USD) | 9 |
| Tax on usage plus service fee (%) | 0 |
(2.10 water + 2.50 sewer) × 12 + 9 = 64.20.
Tool result · USD 64.20
| Tool input | Value |
|---|---|
| Currency | USD |
| Utility | Water |
| Volume or billing unit | m³ |
| Metered usage | 12 |
| Tariff type | Flat rate |
| Price per billing unit (USD) | 2.1 |
| Service fee (USD) | 9 |
| Tax on usage plus service fee (%) | 0 |
2.10 × 12 + 9 = 34.20.
Tool result · USD 34.20
What the comparison shows
The 30.00 difference isolates the sample sewer charge. The comparison holds the service fee constant.
Assumptions and limits
Add rates only when the same volume is billable on both lines. Separate capped, seasonal or irrigation charges before combining.
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