What flow does a house need?

Typical fixtures run 4–10 L/min each; whole-house supply is usually sized for 20–40 L/min peak demand.

GPM measures liquids, CFM gases — both are volume-per-time, so they convert directly. Context decides which you quote.

Why do pump curves matter more than max flow?

Flow collapses as head pressure rises. A pump’s curve at your actual head beats any single max-flow number.

Flow Rate Converter

Convert liquid and air flow rates between metric and US units.

Convert fluid flow rates instantly. Free L/min, GPM, CFM and m³/h converter for plumbing, HVAC and aquariums.

About Flow Rates

Convert liquid and air flow rates between metric and US units.

Flow is volume per time, anchored here to liters per minute. US gallons and cubic feet convert through exact metric equivalents, so a showerhead’s 2.5 GPM reads about 9.5 L/min anywhere in the world.

Distinguish liquid flow (GPM, L/min) from air flow (CFM, m³/h) by context — the math is identical, the applications differ. Everything runs in your browser.

Where it is used

Sizing pumps and filters, HVAC airflow specs, aquarium turnover rates, and irrigation planning.

How to use the Flow Rates

Value — enter the value (e.g. 10).
From — enter the value.
To — enter the value.
Calculate — press the Calculate button to see the result instantly above.

Formula

Anchor to L/min (1 US GPM ≈ 3.785 L/min, 1 CFM ≈ 28.317 L/min).

Examples

Example

value:10

from:GPM

to:L-min

Result: 10 GPM (US) = 37.8541 L/min

Frequently Asked Questions

What flow does a house need?: Typical fixtures run 4–10 L/min each; whole-house supply is usually sized for 20–40 L/min peak demand.
GPM vs CFM?: GPM measures liquids, CFM gases — both are volume-per-time, so they convert directly. Context decides which you quote.
Why do pump curves matter more than max flow?: Flow collapses as head pressure rises. A pump’s curve at your actual head beats any single max-flow number.

Calculator Inputs