Compare showerheads at the same duration
A resident measures 5 L in 30 seconds before changing a showerhead and 3 L in 30 seconds afterward. Compare the two measured flows for a seven-minute shower.
Open CalculatorInputs and calculation
| Tool input | Value |
|---|---|
| Currency | USD |
| Volume or billing unit | m³ |
| Activity measurement | Flow over time |
| Flow (L/min) | 10 |
| Minutes per occurrence | 7 |
| Occurrences per person per day | 1 |
| People (1 for shared use) | 1 |
| Days or equivalent sessions | 30 |
| Price per billing unit (USD) | 4 |
10 L/min × 7 min × 1 × 1 × 30 = 2100 L. Divide by 1,000 for m³ and multiply by 4 for USD 8.40.
Tool result · USD 8.40
| Tool input | Value |
|---|---|
| Currency | USD |
| Volume or billing unit | m³ |
| Activity measurement | Flow over time |
| Flow (L/min) | 6 |
| Minutes per occurrence | 7 |
| Occurrences per person per day | 1 |
| People (1 for shared use) | 1 |
| Days or equivalent sessions | 30 |
| Price per billing unit (USD) | 4 |
6 L/min × 7 min × 1 × 1 × 30 = 1260 L. Divide by 1,000 for m³ and multiply by 4 for USD 5.04.
Tool result · USD 5.04
| Tool input | Value |
|---|---|
| Currency | USD |
| Volume or billing unit | m³ |
| Activity measurement | Flow over time |
| Flow (L/min) | 6 |
| Minutes per occurrence | 10 |
| Occurrences per person per day | 1 |
| People (1 for shared use) | 1 |
| Days or equivalent sessions | 30 |
| Price per billing unit (USD) | 4 |
6 L/min × 10 min × 1 × 1 × 30 = 1800 L. Divide by 1,000 for m³ and multiply by 4 for USD 7.20.
Tool result · USD 7.20
What the comparison shows
Equal-duration savings are 840 L. At ten minutes after replacement, only 300 L of that baseline difference remains.
Assumptions and limits
Flow depends on pressure and valve position. A longer shower can offset a lower flow.