Free Toolkit

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

Flow Rate Converter illustration
⚖️

Flow Rate Converter

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

How to Use
1

Enter flow rate

Type the flow rate value to convert.

2

Select units

Choose source and target flow rate units.

3

Get the result

Converted flow rate appears instantly.

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 Our 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 systems.

Hydrology

Convert river flow measurements between CFS and m³/h.

Industrial Processes

Convert process flow rates for 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.

Related Tools

Volume Converter

Convert between milliliters, liters, US/UK gallons, fluid ounces, cups, pints, quarts, and cubic meters.

Unit Converters

Pressure Converter

Convert between Pascal, kilopascal, bar, atmosphere, PSI, mmHg, and Torr pressure units.

Unit Converters

Density Converter

Convert between kg/m³, g/cm³, lb/ft³, lb/in³, and kg/L density units.

Unit Converters

Viscosity Converter

Convert between pascal-seconds, centipoise, poise, stokes, and ft²/s viscosity units.

Unit Converters

Length Converter

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles instantly.

Unit Converters

Weight Converter

Convert between milligrams, grams, kilograms, ounces, pounds, metric tons, and stones in real time.

Unit Converters

Frequently Asked Questions

QHow do I convert GPM to L/min?
Multiply GPM by 3.78541. For example, 10 GPM ≈ 37.85 L/min.
QWhat is CFS?
Cubic feet per second — the standard US hydrology unit for measuring river flow. 1 CFS = 28.32 L/s.
QWhat 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.
QHow do I convert L/min to m³/h?
Multiply L/min by 0.06. For example, 100 L/min = 6 m³/h.

About Flow Rate Converter

Flow Rate Converter is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.