Two-person shower routine
Two people each take one shower daily. They want a shared monthly estimate and a way to see what changing the duration means for the meter.
Open CalculatorInputs and calculation
| Tool input | Value |
|---|---|
| Currency | USD |
| Volume or billing unit | m³ |
| Activity measurement | Flow over time |
| Flow (L/min) | 8 |
| Minutes per occurrence | 7 |
| Occurrences per person per day | 1 |
| People (1 for shared use) | 2 |
| Days or equivalent sessions | 30 |
| Price per billing unit (USD) | 2.5 |
8 L/min × 7 min × 1 × 2 × 30 = 3360 L. Divide by 1,000 for m³ and multiply by 2.5 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) | 8 |
| Minutes per occurrence | 5 |
| Occurrences per person per day | 1 |
| People (1 for shared use) | 2 |
| Days or equivalent sessions | 30 |
| Price per billing unit (USD) | 2.5 |
8 L/min × 5 min × 1 × 2 × 30 = 2400 L. Divide by 1,000 for m³ and multiply by 2.5 for USD 6.00.
Tool result · USD 6.00
What the comparison shows
Two minutes less per shower means 960 L less across both people. This is the water charge before any separate heating costs.
Assumptions and limits
Measure flow at the fixture by dividing a collected volume by the collection time. A fixture’s rated flow may differ from its flow at the home’s water pressure.