Flow Rate Converter Convert between L/s, L/min, m³/h, gal/min (GPM), and ft³/s (CFS).

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Flow Rate Converter

Convert between L/s, L/min, m³/h, gal/min (GPM), and ft³/s (CFS).

Enter flow rate

Type the flow rate value to convert.

Select units

Choose source and target flow rate units.

Read the converted flow rate

Converted flow rate appears instantly.

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What Is Flow Rate Converter?

A flow rate converter translates between units measuring the volume of fluid passing a point per unit time. Liters per second and liters per minute are common metric units. Gallons per minute (GPM) is standard in US plumbing and HVAC. Cubic meters per hour is used in industrial processes. Cubic feet per second (CFS) is the standard unit in US hydrology for measuring river and stream flow. Accurate flow rate conversion is essential for plumbing design, HVAC engineering, hydraulic systems, and environmental monitoring.

Why Use Flow Rate Converter?

Covers the five essential flow rate units for engineering and industry.
Critical for plumbing, HVAC, and hydraulic system design.
Real-time bidirectional conversion.
Uses exact conversion factors.

Common Use Cases

Plumbing

Convert between GPM and L/min for fixture flow rate specifications.

HVAC

Size pumps and piping by converting flow rates between metric and imperial systems.

Hydrology

Translate river flow measurements between CFS and m\u00b3/h for field reports.

Industrial Processes

Match process flow rates to international equipment specifications.

Technical Guide

Flow rate measures volume per unit time (Q = V/t). The relationships:

• 1 L/s = 60 L/min
• 1 L/s = 3.6 m³/h
• 1 L/min = 0.264172 gal/min (US)
• 1 gal/min (US GPM) = 3.78541 L/min
• 1 ft³/s (CFS) = 28.3168 L/s = 448.831 GPM

Common flow rates:
• Kitchen faucet: 8-10 L/min (2-2.5 GPM)
• Shower: 8-10 L/min (2-2.5 GPM)
• Garden hose: 20-40 L/min (5-10 GPM)
• Fire hydrant: 60-250 L/s (1,000-4,000 GPM)

Note: This converter handles volumetric flow rate. Mass flow rate (kg/s) requires knowing the fluid density.

Tips & Best Practices

1
1 GPM ≈ 3.785 L/min. For quick estimates, multiply GPM by 3.8.
2
Low-flow fixtures use 1.5 GPM or less (about 5.7 L/min).
3
1 CFS = 448.8 GPM — CFS is a much larger unit.
4
Flow rate and pressure are related: higher pressure generally means higher flow through a given pipe.

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Frequently Asked Questions

Q How do I convert GPM to L/min?

Multiply GPM by 3.78541. For example, 10 GPM ≈ 37.85 L/min.

Q What is CFS?

Cubic feet per second — the standard US hydrology unit for measuring river flow. 1 CFS = 28.32 L/s.

Q What is a typical faucet flow rate?

About 2-2.5 GPM (8-10 L/min) for standard faucets, or 1.5 GPM for low-flow models.

Q How do I convert L/min to m³/h?

Multiply L/min by 0.06. For example, 100 L/min = 6 m³/h.

About This Tool

Flow Rate Converter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.