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PHOENIX
27.3.2012 | http://www.phoenix-conveyor-belts.com/pages/technical-information/conversion-
factors/conversion-factors_en.html
Conversion factors fps/SITechnical Information
Below are instructions for converting factors of the most important units of fps* to the SI-
System
*fps - system: foot pound second-system
Unit fps SI (MKS)
Length 1 ft = 1/3 yd = 12 in1ft = 0,3048 m;
1 mile = 1609,34 m
Area 1 ft² = 144 in² 1ft² = 0,092903 m²
Volume
1 ft³ = 1728 in³ = 6,22882
gal (UK)
1 gal (US) = 0,83268 gal
(UK)
1ft³ = 0,0283169 m³1 bu = 35,2393 l; 1
bbt (US) = 115,627 l
Speed
1 ft/s
1 knot = 1,150785 mile/h
=1,6877 ft/s
1ft/s = 0,3048 m/s
Acceleration 1 ft/s² 1ft/s = 0,3048 m/s²
Mass
1 lb = cwt/112; 1 sh tn= 2000 lb
1 slug = 32,174 lb; 1 in tn
= 2240 lb
1lb = 0,453592 kg
1 slug = 14,5939 kg
Force1 lbf
1 pdl = 0,031061 lbf
1 lbf = 4,44822 N
1 pdl = 0,138255 N
Work
1 ft lb = 0323832 calIT1
btu = 252 calIT = 778,21
ft lb
1 ft lb = 1,35582 J
1 btu = 1,05506 kJ
Pressure
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Unit fps SI (MKS)
1 lb/ft² = 6,9444 x 10-3
lb/in²
1 lb/in² = 0,068046 atm
1 atm = 29,92 in Hg =33,90 ft water
1 lb/ft² = 47,88 N/m²
1 lb/in² = 6894,76
N/m²
1 atm = 1,01325 bar
Density
1 lb/ft³ = 5,78704 x 10-4
lb/in³
1 lb/gal = 6,22882 lb/ft³
1 lb/ft³ = 16,0185
kg/m³
1 lb/gal = 99,7633
kg/m³
Temperature32 °F = 0°C; 212 deg
F = 100°C1 °F = 0,5556 °C
Power
1 ft lb/s = 1,8182 x 10-3
hp
= 1,28505 x 10-3 btu/s
1ft lb/s = 1,35582 W
Abbreviations and names of English units
atm atmosphere
bbl barrel
btu British thermal unit
bu bushel
cwt hundredweight
cal calorie
°F degree Fahrenheit
ft foot
gal gallon
hp horsepower
in inch
lb pound
lbf pound force
ln tn long ton
pdl poundel
sh tn short ton
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© 2012 Phoenix Conveyor Belts
yd yard
UK United Kingdom
US United States of America
in/s inch per second
in² square inch
in³ cubic inch
Published by kind permission of Springer-Verlag, Heidelberg from: Dubbel, Taschenbuch für
den Maschinenbau (Mechanical Engineering Paperbock), 17th edition (1990)
Note:
The belt tensile force related to belt width is converted as follows: 1 piw = 0,175 N/mm
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