Fans - Metric (SI) Conversion Table

The conversion factors below cover practically all of the units commonly used in the air moving and conditioning industry. Simply multiply the present units by the conversion factor to get metric (SI) units.

Present Units Conv. Factor Metric (SI) Units
Dimensions:
foot
inch
X 0.3048
X 25.4
= m (meter)
= mm (millimeter)
Mass:
pound
ounce
grain
X 0.3048
X 0.453 59
X 0.028 35
X 0.064 799
= kg (kilogram)
= kg
= g (gram)
Time:
minute X 60 = s (second)
Temperature:
Fahrenheit
Celcius
Fahrenheit
(�F + 459.67) � 1.8
�C + 273.15
�F - (32 � 1.8)
= K (Kelvin)
= K
= �C (Celcius)
Flow:
cfm
lbs/hour
X 0.000 471 95
X 0.000 126
= m�/s
= kg/s
Density:
lbs/cu.ft. X 16.018 46 = kg/m�
Force:
pounds force X 4.448 22 = N (Newton) = kg m/s�
Pressure:
in. w.g.
mm w.g.
in. Hg
oz/sq.in.
lb/sq.in.
atmosphere
X 0.248 36
X 6.308 34
X 3.386 39
X 0.430 92
X 6.894 76
X 101.325
= kPa (kilo Pascal) = kN/m�
= kPa
= kPa
= kPa
= kPa
= kPa
Energy, Work:
ft.lb.
BTU
kW hour
HP hour
X 1.355 82
X 1.055 06
X 3600
X 2684.52
= J (Joule) = Nm
= kJ (kilo Joule)
= kJ
= kJ
Power, Heat Flow::
BTU/hr
HP
ton of refr.
X 0.293 07
X 0.7457
X 3.516 85
= W (Watt)
= kW (kilo Watt)
= kW
Angles:
degrees X pi � 180 = rad (radian)
Speed:
RPM
RPM
� 60
X 2pi � 60
= r/s (revolutions/s)
= rad/s
Tip Speed:
ft. per min. X 0.005 08 = m/s
Velocity:
fpm X 0.005 08 = m/s
Acceleration:
ft/s�
32.2 ft/s�
X 0.3048
X 9.806 65
= m/s�
= m/s�
Torque:
lb. in.
lb. ft.
X 0.112 98
X 1.355 82
= N m
= N m
Moment of Inertia (WK�):
lbs. ft.� X 0.042 14 = kg m�
Stress:
PSI X 6.894 76 = kPa
Area:
sq. ft.
sq. in.
X 0.092 903
X 645.16
= m�
= mm�
Volume:
cu. ft.
cu. in.
X 0.028 317
X 16.387 06
= m�
= cm�
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