Conversion factors fps/SI

Technical 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 in 1ft = 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 m³
1 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
Force 1 lbf
1 pdl = 0,031061 lbf
1 lbf = 4,44822 N
1 pdl = 0,138255 N
Work 1 ft lb = 0323832 calIT 1 btu = 252 calIT = 778,21 ft lb 1 ft lb = 1,35582 J
1 btu = 1,05506 kJ
Pressure 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
Temperature 32 °F = 0°C; 212 deg
F = 100°C
1 °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
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

Conversion Factors fps/SI – Phoenix Conveyor Belt