Cubic Meters per Hour ⇄ Cubic Feet per Minute

Measure airflow with confidence using this precise converter. Enter a value in either box to translate between m³/h and CFM. Adjust decimal places to match your specification sheets. Explore the formula, unit background, and rounding guidance below. Built for HVAC, process, and lab sizing tasks where clarity and traceability matter.

Converter

Type here to convert to CFM.
Type here to convert to m³/h.
0–12 decimals (default 4).

About the Units

m³/h expresses volumetric flow per hour in the SI system. CFM expresses volumetric flow per minute in U.S. customary units. The link between them is set by the exact definition of the foot and meter, with the conversion for volume and the hour‑to‑minute time scale.

The factor used here is derived from 1 m³ = 35.3146667 ft³. Dividing by 60 converts “per hour” to “per minute,” yielding 0.5885777783 CFM per 1 m³/h.

FAQs

1) What is the exact conversion factor from m³/h to CFM?

CFM = m³/h × 35.3146667 ÷ 60 ≈ m³/h × 0.5885777783.

2) How do I convert CFM back to m³/h?

m³/h = CFM × 60 ÷ 35.3146667 ≈ CFM × 1.6990107966.

3) Why do my results differ slightly from other tools?

Some tools round intermediate constants. This calculator uses a high‑precision constant (35.3146667 ft³ per m³) to minimize rounding error.

4) How many decimal places should I use?

For specifications, 3–4 decimals are common. For quick estimates, 1–2 are fine. You can set 0–12 decimals here.

5) Does temperature or pressure affect the conversion?

This is a pure unit conversion. If you need mass flow or standard conditions adjustments, apply separate corrections.

6) Can I type in either box?

Yes. Enter a value in m³/h to get CFM or enter CFM to get m³/h. Use the “Swap” button to set the direction before calculating.

7) Can I copy the result?

Use the “Copy” button in the green result banner to place the value on your clipboard.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.