FPM to m/s Converter
Use the FPM to m/s converter when a drawing, fan schedule, commissioning sheet, or instrument gives air velocity in feet per minute and your calculation needs metres per second. Enter the known reading in the FPM to m/s calculator, then compare the result with the source specification.
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FPM to m/s formula
m/s = FPM × 0.00508
FPM = m/s ÷ 0.00508
The factor is 0.00508 m/s for each 1 FPM. Going the other way, 1 m/s is 196.85039 FPM.
FPM to m/s reference table
| FPM | m/s |
|---|---|
| 300 | 1.524 |
| 500 | 2.54 |
| 700 | 3.556 |
| 1,000 | 5.08 |
| 1,200 | 6.096 |
| 1,500 | 7.62 |
| 1,800 | 9.144 |
| 2,000 | 10.16 |
| 2,500 | 12.7 |
| 4,000 | 20.32 |
Where this conversion is used
Air velocity limits for ducts, grilles, diffusers, coils and filters are quoted in FPM in US references and in m/s in metric design guides. You use this conversion when you check duct velocity against a noise limit, read the face velocity of a coil or filter, or compare an anemometer reading in one unit with a design value in the other.
Worked example
A main supply duct is sized for a velocity of 1,500 FPM and the specification limits main duct velocity in m/s.
1,500 FPM × 0.00508 = 7.62 m/s
Compare 7.62 m/s with the limit in the specification.
Common mistakes
- Confusing velocity with airflow. FPM and m/s are speeds. CFM, L/s and m³/h are volume flows. Airflow equals velocity multiplied by the duct area.
- Using the outside dimensions of an insulated duct to work out the area. Use the clear inside dimensions.
- Treating a single anemometer reading as the average duct velocity. Velocity varies across the duct, so take a traverse and average the readings.
Related HVAC calculations
If your next step is duct selection, a ductwork design tool online can help calculate duct dimensions from airflow and friction-loss requirements. DuctArchitect's Duct Sizing feature addresses those design inputs. This converter is one check within the larger workflow.
Frequently asked questions
How do I convert an FPM reading to m/s?
Convert FPM to m/s by multiplying the entered value by 0.00508. For example, 500 FPM equals 2.54 m/s. This changes the speed unit, not the airflow volume.
What is 1 FPM in m/s?
1 FPM equals 0.00508 m/s. The factor comes from 0.3048 metres per foot divided by 60 seconds per minute.
Is FPM the same as CFM?
No. FPM measures velocity, while CFM measures volumetric airflow. Cross-sectional area is needed to calculate one from the other, and the units must be consistent.
Does duct size affect a converted FPM value?
No, not when the input velocity is already known. Duct dimensions matter when calculating velocity from airflow, but the unit conversion factor remains 0.00508.
How can an air balancing velocity calculator help?
An air balancing velocity calculator can help compare measured speeds with project targets during air distribution checks. Record the measurement point, equipment condition, and design reference. Conversion alone does not confirm system balance.
How do mechanical engineers calculate HVAC loads?
Mechanical engineers calculate HVAC loads by evaluating peak thermal gains and losses through building envelopes, occupancy schedules, lighting, equipment heat, and outdoor air ventilation rates. Air speed FPM to m/s conversions and airflow volume calculations then determine the required supply air delivery rates across duct networks.
Who is responsible for HVAC engineering calculations?
Licensed mechanical design engineers, MEP consultants, or qualified HVAC contractors hold primary responsibility for performing load calculations and duct velocity sizing. Accurate duct air velocity calculations prevent system noise, uneven temperature distribution, and excessive static pressure.
How can HVAC teams in Saudi Arabia convert FPM readings to m/s?
An HVAC air velocity calculator for Saudi Arabia projects can convert a recorded FPM value to m/s by multiplying it by 0.00508. Contractors and consultants can use the result to compare units in drawings and commissioning records, then check the reading against the project specification.
How can HVAC contractors in Qatar check duct air velocity in m/s?
An HVAC duct velocity calculator for Qatar projects can convert readings from FPM to m/s using the factor 0.00508. Contractors can use the converted values when reviewing drawings or commissioning records, while the project's engineering specifications determine the acceptable velocity.