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Flow Rate Converter — m³/h to L/min, gpm, cfm

L/s · L/min · gpm · cfm · m³/h · ft³/s

Free flow rate converter with live results. Popular conversion: flow conversion calculator. Also handles air flow rate converter. Everything runs locally in your browser — no upload, no account.

From

Value (m³/h)

Result (L/min)

16.66666667

All unit equivalents

Complete guide to gpm, cfm, L/min & flow unit conversion

Flow rate converter — L/s, L/min, gpm, cfm, and m³/h online

Volumetric flow rate is how much volume passes a point per unit time. Plumbing uses gallons per minute, HVAC quotes cubic feet per minute for air, European process lines use cubic meters per hour, and labs often work in liters per minute or liters per second. This converter switches between those units from one input.

Supported units include L/s, L/min, SLPM, m³/h, m³/s, US gpm, cfm, ft³/h (SCFH-scale), and ft³/s (cusec). All math runs locally in your browser — nothing is uploaded.

m³/h to L/min — metric process flow

Process datasheets often quote m³/h; lab and small-bore specs use L/min:

L/min = m³/h × 1,000 ÷ 60 = m³/h × 16.667 · m³/h = L/min × 0.06

Example: 6 m³/h = 100 L/min · 1 m³/h ≈ 16.67 L/min. The same factors apply to water and other incompressible liquids at steady state.

gpm, L/min, and US liquid flow

US plumbing and pumps use US gallons per minute (gpm):

1 US gpm = 3.785 L/min = 0.0631 L/s

10 gpm = 37.85 L/min · 60 gpm = 227 L/min (about 13.6 m³/h). Convert between L/s and L/min by multiplying or dividing by 60 — both are in the dropdown.

cfm, SCFH, SCFM, and SLPM — air and gas flow

HVAC and compressed gas specs use cubic feet per minute (cfm) or standard cubic feet per hour (SCFH). At the same temperature and pressure reference, SCFM and cfm use the same volume-per-time math — "standard" defines which T and P apply.

Key relations: 1 cfm ≈ 28.3 L/min ≈ 0.472 L/s · 1 ft³/h ≈ 0.472 L/min · 60 cfm = 3,600 ft³/h. Divide SCFH by 60 for SCFM; multiply SCFM by 60 for SCFH. Standard litres per minute (SLPM) at STP scales like L/min for unit conversion — select SLPM or L/min in the dropdown.

Converting ACFM to DSCFM needs actual vs standard temperature and pressure correction — not a single fixed factor.

Cusec, m³/s, and large-channel flow

Hydrology uses cusec (cubic feet per second, ft³/s): 1 ft³/s ≈ 28.3 L/s ≈ 1,699 L/min. One cubic meter per second equals 1,000 L/s or 3,600 m³/h — river and canal ratings in civil engineering.

Step-by-step flow rate conversion examples

m³/h → L/min: 6 m³/h × 16.667 = 100 L/min

gpm → L/min: 10 gpm × 3.785 = 37.85 L/min

cfm → L/s: 100 cfm × 0.472 = 47.2 L/s

SCFH → L/min: 1,000 ft³/h × 0.472 ≈ 472 L/min

gpm vs cfm

gpm is liquid volume flow (US gallons). cfm is cubic feet per minute — typical for air ducts and compressors. Both convert through L/s internally.

SCFH and SCFM

Standard cubic feet use a defined T and P. For unit scaling, 1 SCFM ≈ 1 cfm numerically; SCFH = SCFM × 60.

Mass flow needs ρ

kg/h = (L/min × ρ in kg/L × 60). Convert Q here, look up ρ on the Density Converter, then multiply.

Flow rate — gpm, cfm, L/min & m³/h FAQ

How do I convert m³/h to L/min?

Multiply m³/h by 16.667. For example, 6 m³/h equals 100 L/min.

How do I convert gpm to L/min?

Multiply US gpm by 3.785.

How do I convert cfm to L/s?

Multiply cfm by 0.472.

How do I convert cfm to L/min?

Multiply cfm by 28.3.

How do I convert SCFH to L/min?

Multiply ft³/h by about 0.472 (use the ft³/h unit).

How do I convert SLPM to L/min?

At STP, treat as equivalent for unit scaling.

How do I convert cusec to L/s?

1 ft³/s is about 28.3 L/s.

How do I convert volumetric to mass flow?

Multiply by density (ṁ = Q × ρ). Use the Density Converter for ρ.

How do I get flow velocity in a pipe?

v = Q / A — you need pipe cross-section area.

Is my data uploaded?

No. All flow conversion runs locally in your browser.