IES
Mechanical Engineering2D

Flow Unit Conversion Calculator

Convert between flow rate units: m³/h, m³/s, L/min, L/s, and GPM (US gallons per minute).

Inputs
Enter your values below
Result
Converted Flow
—
Enter values and click Calculate
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Formula
input_flow ÷ from_factor × to_factor

Converts via SI base (m³/s): result = value × (factor_from / factor_to). Factors are units per m³/s: m³/s=1, m³/h=3600, L/min=60000, L/s=1000, GPM=15850.

Introduction

Convert flow rate units instantly between m3/h, GPM (gallons per minute), L/min, CFM, m3/s, and more. This flow unit converter supports all common engineering flow units for liquids and gases. Enter a value, select from and to units, and get instant conversion for pipe sizing, pump selection, and process engineering calculations.

How This Calculator Works

Converts via SI base (m³/s): result = value × (factor_from / factor_to). Factors are units per m³/s: m³/s=1, m³/h=3600, L/min=60000, L/s=1000, GPM=15850.

Step-by-step process:

  1. Enter your input values in the calculator above
  2. The engine converts all inputs to SI base units (meters, kg, Pa)
  3. The formula is evaluated: input_flow / from_factor * to_factor
  4. Result is formatted with the appropriate unit and precision

Calculation Example

100 m³/h = 440.3 GPM (US gallons per minute).

Inputs: input_flow=100, from_factor=3600, to_factor=15850
Result: 440.3

Engineering Applications

  • •Unit conversion
  • •Equipment comparison
  • •Specification checking
  • •International projects

Frequently Asked Questions

What is the conversion from m³/h to GPM?

1 m³/h = 4.403 US GPM. 1 m³/h = 3.666 UK (imperial) GPM.

How do I convert mass flow to volumetric flow?

Volumetric flow (m³/s) = mass flow (kg/s) / density (kg/m³). For water, 1 kg/s ≈ 3.6 m³/h.

How do you convert m3/h to GPM?

1 m3/h = 4.403 US GPM. To convert m3/h to GPM, multiply by 4.403. For example, 10 m3/h = 44.03 GPM. Use this converter for instant results with any flow unit.

How do you convert L/min to m3/h?

1 L/min = 0.06 m3/h. To convert L/min to m3/h, multiply by 0.06. For example, 100 L/min = 6 m3/h.

What is CFM and how do you convert it?

CFM (Cubic Feet per Minute) is a flow unit for gases. 1 CFM = 1.699 m3/h = 0.472 L/s. CFM is commonly used for HVAC and compressed air systems.

What flow units does this converter support?

This converter supports: m3/h, m3/s, L/min, L/s, GPM (US), GPM (UK), CFM, and mm3/s. All conversions are based on standard SI unit relationships.

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Engineering Disclaimer: Calculations are for reference and educational purposes only. Always verify results independently for engineering design. See full disclaimer.
Reviewed by: Industrial Engineering Team
References: ASME B31.3, ASTM A36, Perry's Chemical Engineers' Handbook