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Machine Design

How-to, in-depth technical articles for machine design engineers

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

Power Transmission

Gear drives, bearings, motors, clutches, couplings, machine controls, sensors and components.

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barrel (US, liq.) per foot
Symbol:  bbl (US, liq.)/ft 
Category:  Area 
SI Equivalent:  0.391209 m2
Dimension L2 
System:  US 
American unit of area used in chemical engineering industry.
1 bbl (US, liq.)/ft = 31.5 gal (US, liq.)/ft.
Convert     bbl (US, liq.)/ft  
1 bbl (US, liq.)/ft =
  Symbol Unit Name
9.66698×10-5  ac, acre  acre 
3.91209×10-3  a  are 
3.91209×1027  b  barn 
8.33333×10-2  bbl (US, liq.)/in  barrel (US, liq.) per inch 
0.75  bbl (US, petrol)/ft  barrel (US, petrol) per foot 
6.25×10-2  bbl (US, petrol)/in  barrel (US, petrol) per inch 
0.391209    centare 
772.061  cin  circular inch 
7.72061×108  cmil  circular mil 
3.91209×10-5  ha  hectare 
4.74518×10-5    morgen (Dutch) 
1.54491×10-4    morgen (Prussian) 
4.56737×10-5    morgen (South Africa) 
6.04186×10-7    quarter section 
3.86679×10-4    rood (UK) 
1.51047×10-7  sq.mi, mi2 (stat.)  section (square statute mile) 
3.91209×1051    shed 
3912.09  cm2  square centimeter 
4.21094×10-4  sq. ch. (engineer's)  square chain (engineer's) 
9.66698×10-4  sq. ch. (Gunter's)  square chain (Gunter's) 
3.91209×10-3  dam2  square decameter 
39.1209  dm2  square decimeter 
3.91209×10-37  Em2  square exameter 
3.91209×1029  fm2  square femtometer 
3.91209×1029  f2  square fermi 
4.21094  ft2  square foot 
3.91209×10-19  Gm2  square gigameter 
3.91209×10-5  hm2  square hectometer 
606.375  in2, sq. in  square inch 
3.91209×10-7  km2  square kilometer 
3.91209×10-13  Mm2  square megameter 
0.391209  m2  square meter 
3.91209×1011  ┬Ám2  square micrometer 
6.06375×108  mil2  square mil (thou) 
7.10256×10-9  sq. mi. (geogr.)  square mile (geographical) 
1.14058×10-7  sq. mi. (int. naut.)  square mile (int. naut.) 
1.51046×10-7  sq. mi. (int.)  square mile (int.) 
3.91209×105  mm2  square millimeter 
3.91209×1017  nm2  square nanometer 
1.54671×10-2  rd2  square perch 
3.91209×10-31  Pm2  square petameter 
3.91209×1023  pm2  square picometer 
1.54671×10-2  rd2  square pole 
1.54671×10-2  rd2  square rod 
3.91209×10-25  Tm2  square terameter 
0.467882  yd2, sq. yd  square yard 
3.91209×1047  ym2  square yoctometer 
1.14966×10-39  Ym2  square yottameter 
3.91003×1041  zm2  square zeptometer 
1.14966×10-39  Zm2  square zettameter 
4.19574×10-9    township (US) 
2.17507×10-4    vergee (Jersey) 
2.53758×10-4    vergees (Guernsey) 
Fuel Consumption
  Symbol Unit Name
1.6632×105  gal/mile  gallon per mile 
3.91209×107  l/100 km  liter per 100 kilometers 
3.91209×105  l/km  liter per kilometer 
Hydrodynamic permeability
  Symbol Unit Name
3.96392×1011    darcy