1 bar = 100,000 Pa ≈ 14.5 psi
1 atm (normal) ≈ 101,325 Pa ≈ 14.7 psi
1 atm (technical) = 1 kg/cm2 ≈ 98,067 Pa
1 m H2O ≈ 0.1 bar
1 in ≈ 25.400 mm
1 ft ≈ 304.800 mm
1 m ≈ 3.281 ft
1 mL = 1 cm3
1 L = 1000 mL
1 US gallon ≈ 3.785 L
1 UK gallon ≈ 1.2 US gallon
1 oil barrel = 42 US gallon ≈ 159 L
1 oil barrel @ steel drum = 55 US gallon ≈ 209 L
1 US beer barrel = 31 US gallon
1 UK beer barrel = 36 UK gallon
1 hp = 550 ft•lb/s ≈ 746 W ≈ 0.746 kW ( ≈ ¾ kW )
1 BTU = 778 ft•lb
TF = ( 9 / 5 ) TC + 32
TC = ( 5 / 9 )( TF - 32 )
1 kg ≈ 2.205 lb
1 slug ≈ 32.17 lb
1 ton (M) = 1000 kg
1 ton (S) = 2000 lb
1 ton (L) = 2240 lb
1 ton (R) = 200 BTU/min ≈ 3000 kCal/h
1 ton (D) = 100 ft3
1 mile (nautical) = 1 knot
≈ 1 minute of angle at the equator
≈ 1.8538 km , widely accepted as 1.852 km exactly
1 mile (statute) ≈ 1.609 km
1 acre widely accepted as 43,560 ft2
1 chain = 66 ft
1 furlong = 10 chains


F @ W M ρ γ
SI N kg kg/m3 N/m3
BG lb slug slug/ft3 lb/ft3


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