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
