Metric conversion Factors for Fan Application per AMCA Standard

September 1st, 2004

Quantity "English" Unit Metric Unit Conversion Factor
Volume cubic feet per minute
CFM
cubic meter per second
m^3/S
cubic meter per minute
m^3/min
cubic meter per hour
m^3/hr
liter per second
l/s
0.00047195

0.028317

1.6990

0.47195
Pressure inches of water gauge
in. wg
pascal
Pa or N/m^2
millimeters
mm
248.36

25.4
Power horsepower
hp, BHP
watt
W or J/s
Kilowatt
kw
745.70

0.7457
Torque pound-inch
lb-in.
newton meter
N-m
0.11298
Density pounds per cubic feet
lb/ft^3
kilogram per cubic meter
kg/m^3
16.018
Speed revolutions per minute
RPM
revolution per second
rps
0.01667
Velocity, Tip Speed feet per minute
fpm
meter per second
m/s
0.00508
Dimensions inch
in.
millimeter
mm
25.4
Area square foot

square inch
square meter
m^2
square millimeter
mm^2
0.0929

645.16
Length foot

foot

yard
millimeter
mm
meter
m
meter
m
304.8

0.3048

0.9144
Mass (weight) ounce

pound
gram
g
kilogram
kg
28.350

0.4536
Velocity feet per second

feet per minute

miles per hour
meters per second
m/s
meters per second
m/s
meters per second
m/s
0.3048

0.00508

0.44704
Volume (capacity) cubic inch

cubic yard

gallon (U.S.)

gallon (imperial)
cubic centimeter
cm^3
cubic meter
m^3
liter
l
liter
l
16.3871

0.7646

3.785

4.546

Multiply "English" Unit by conversion factor to obtain Metric Unit.
   For example: 5000 CFM x 0.00047195 = 2.360 m^3/s
Divide Metric Unit by conversion factor to obtain "English" Unit.
  For example: 62.1 Pa / 248.36 = 0.250 in. wg

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