Vintage Knowledge - Conversions

 

Distance
Metric Imperial
1 millimetre [mm]   0.0394 in
1 centimetre [cm] 10 mm 0.3937 in
1 metre [m] 100 cm 1.0936 yd
1 kilometre [km] 1000 m 0.6214 mile

Imperial Metric
1 inch [in]   2.54 cm
1 foot [ft] 12 in 0.3048 m
1 yard [yd] 3 ft 0.9144 m
1 mile 1760 yd 1.6093 km
1 int nautical mile 2025.4 yd 1.852 km

 

Area
Metric Imperial
1 sq cm [cm2] 100 mm2 0.1550 in2
1 sq m [m2] 10,000 cm2 1.1960 yd2
1 hectare [ha] 10,000 m2 2.4711 acres
1 sq km [km2] 100 ha 0.3861 mile2

Imperial Metric
1 sq inch [in2]   6.4516 cm2
1 sq foot [ft2] 144 in2 0.0929 m2
1 sq yd [yd2] 9 ft2 0.8361 m2
1 acre 4840 yd2 4046.9 m2
1 sq mile [mile2] 640 acres 2.59 km2

 

Volume
Metric Imperial
1 cu cm [cm3 or cc]   0.0610 in3
1 cu decimetre [dm3] 1,000 cm3 0.0353 ft3
1 cu metre [m3] 1,000 dm3 1.3080 yd3
1 litre [l] 1 dm3 1.76 pt
1 hectolitre [hl] 100 l 21.997 gal

Imperial Metric
1 cu inch [in3]   16.387 cm3 or cc
1 cu foot [ft3] 1,728 in3 0.0283 m3
1 fluid ounce [fl oz]   28.413 ml
1 pint [pt] 20 fl oz 0.5683 l
1 gallon [gal] 8 pt 4.5461 l

USA measure Metric
1 US fluid ounce 1.0408 UK fl oz 29.574 ml
1 US pint (16 fl oz) 0.8327 UK pint 0.4731 l
1 US gallon 0.8327 UK gal 3.7854 l

 

Weight
Metric Imperial
1 milligram [mg]   0.0154 grain
1 gram [g] 1,000 mg 0.0353 oz
1 kilogram [kg] 1,000 g 2.2046 lb
1 tonne [t] 1,000 kg 0.9842 ton

Imperial Metric
1 ounce [oz] 437.5 grain 28.35 g
1 pound [lb] 16 oz 0.4536 kg
1 stone 14 lb 6.3503 kg
1 hundredweight [cwt] 112 lb 50.802 kg
1 ton 20 cwt 1.016 t

 

Power
Unit Name Symbol SI Equivalent 
British thermal unit (therm.) per hour  Btu (therm.)/h  0.292875 W 
foot-pound force per second  ft-lbf/s  1.35582 W 
horsepower (550ft-lbf/s)  HP  745.7 W 
horsepower (cheval-vapeur)  cv, HP  735.499 W 
horsepower (Metric)  HP  735.499 W 
kilowatt  kW  1000 W 

 

Pressure

PSI

Atmosphere

Bar

mm of Hg

1

.06804596

.06894757

51.71

14.7

1

1.01

760

14.5

.98692327

1

750.06

.01933677

.00131579

.00133322

1

1 pound per square inch = 6,894.75729316836 newton/meter2

1 atmosphere = 101,325 newton/meter2

1 bar =100,000 newton/meter2

1 millimeter of mercury = 133.322368421 newton /meter2

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