Calcoid

CFM to m3/h Converter

Convert airflow between cubic feet per minute and cubic meters per hour in both directions, with liters per second and cubic feet per hour too.

CFM to m3/h Converter

Enter a non-negative airflow in CFM to convert to m3/h.

100 CFM equals

169.9 m3/h

Cubic feet / min

100 CFM

Cubic meters / hour

169.9 m3/h

Liters / second

47.1947 L/s

Cubic feet / hour

6,000 CFH

For context: 100 CFM is roughly a residential bathroom exhaust fan at 80 CFM (136 m3/h).

Bathroom fan range: 50 to 110 CFM (85 to 187 m3/h) covers most residential bath exhaust fans. The Home Ventilating Institute suggests about 1 CFM per square foot of floor area for a standard bathroom.

Room ventilation range: 100 to 400 CFM (170 to 680 m3/h) is typical for range hoods, single-room air handlers, and portable air movers. To size by air changes, multiply room volume in cubic feet by the desired air changes per hour, then divide by 60.

1 CFM = 1.69901 m3/h = 0.4719 L/s = 60 CFH. 1 m3/h = 0.5886 CFM. Mental shortcut: 1 CFM is about 1.7 m3/h, so multiply CFM by 1.7 to estimate m3/h.

Frequently Asked Questions about the CFM to m3/h Converter

How do you convert CFM to m3/h?
Multiply cubic feet per minute by 1.69901 to get cubic meters per hour. The factor comes from exact unit definitions: one cubic foot is 0.028316846592 m3, and one minute holds 60 of those per hour, so 60 times 0.028316846592 equals 1.69901 m3/h per CFM. For example, 100 CFM is 100 times 1.69901, which is about 169.9 m3/h.
How do you convert m3/h back to CFM?
Divide cubic meters per hour by 1.69901, which is the same as multiplying by 0.5886. So 1,000 m3/h is 1,000 divided by 1.69901, or about 588.58 CFM. This converter runs both directions, so you can switch the toggle instead of doing the division yourself.
What is 1 CFM in liters per second?
One CFM equals about 0.4719 liters per second. That follows from 1 CFM being 28.316846592 liters per minute (one cubic foot per minute), divided by 60 seconds, which gives 0.4719474432 L/s. The converter shows L/s alongside m3/h so you can match HVAC specs that list either unit.
Is CFM a measure of standard or actual airflow?
A plain CFM figure is just a volume flow rate and does not by itself say whether it is standard (SCFM) or actual (ACFM) airflow. SCFM is referenced to a standard air density (a defined temperature, pressure, and humidity), while ACFM is the real volume at the operating conditions. This converter changes units only and does not correct for air density, so convert SCFM and ACFM values separately and keep the label with the number.
How do I size a fan using air changes per hour?
Multiply the room volume in cubic feet by the air changes per hour you want, then divide by 60 to get the required CFM. For a 1,500 cubic foot room at 6 air changes per hour, that is 1,500 times 6 divided by 60, which is 150 CFM. Convert that to 254.9 m3/h with this tool if your fan is rated in metric units.
Why is 1 CFM sometimes shown as 1.7 m3/h?
1.7 is just 1.69901 rounded to one decimal place, a handy mental shortcut. For quick estimates you can multiply CFM by 1.7, but for spec sheets use the full factor 1.69901 to stay accurate. This converter calculates with the exact value (1.69901079552) internally, so reverse conversions round-trip cleanly.

Related Calculators

More calculators in "Conversions"

inHg to PSI ConverterLux to Footcandle ConverterMach to MPH ConverterProof to ABV ConverterTon of Refrigeration to BTU ConverterTroy Ounces to Grams Converter
See all 122 calculators in "Conversions"