How many L/min is a good shower?

Standard showerheads are 2.0-2.5 GPM (about 7.6-9.5 L/min). Low-flow models are 1.5 GPM (5.7 L/min). Faucets are typically 2.0-3.0 GPM.

CFM vs L/min for air?

Cubic feet per minute (CFM) measures airflow for HVAC and ventilation. 1 CFM is about 28.3 L/min. A typical bathroom exhaust fan is 50-100 CFM.

Almost all flow rate specs use US gallons (3.785 L). UK gallons (4.546 L) are 20% larger. This tool handles both - check which your source means.

Plumbers use gal/min, HVAC uses CFM, industrial uses m³/h. Same concept — volume per time — every trade has its own jargon.

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Last updated September 10, 2026 — conversions use exact ISO unit definitions.