Imperial to Metric Conversion Factors
Unit From
Category
Multiply By
To Obtain
Angstroms
Length
10-10
metres
Angstroms
Length
0.1
nanometres
British thermal units
Heat
1055
joules
Btu/hour
Heat Flow
0.293 1
watts
Btu/hour
Heat Flow
1.055 x 10-3
mega joules/hour
Btu/pound
Calorific Value
2.326
kilojoules/kilogram
Btu/pound
Calorific Value
0.002 326
mega joules/kilogram
Btu/pound 0F
Specific Heat
4.186 8
kilojoules/kilogram 0C
Btu/sq. foot hour
Intensity of Heat Flow Rate
3.155
watts/sq. metre
Btu/sq. foot hour 0F
Thermal Conductance (Heat Transfer Co-efficient)
5.678
watts/sq. metre 0C
Btu/std. cubic foot
Calorific Value
0.037 96
mega joules/std. cubic metre
Calories
Heat
4.186 8
joules
Calories/gram
Calorific Value
4.1868
kilojoules/kilogram
cubic feet
Volume
0.02832
cubic metres
cubic feet
Volume
28.32
litres
cubic feet
Volume
28.32
cubic decimetres
cubic feet/hour
Flow Rate
0.028 32
cubic metres/hour
cubic feet/hour
Flow Rate
28.32
litres/hour
cubic feet/hour
Flow Rate
28.32
cubic decimetres/hour
cubic feet/hour
Flow Rate
7.866
millilitres/second
cubic feet/minute
Flow Rate
4.719 x 10-4
cubic metres/second
cubic inches
Volume
16.39
millilitres
cubic inches
Volume
16.39
cubic centimetres
Cycles/second
Frequency
1
hertz
Degrees Fahrenheit
Temperature Difference
0.56
degrees Celsius
Degrees Fahrenheit
Temperature Difference
0.56
kelvins
dynes/sq. centimetre
Pressure & Stress
0.001
millibars
dynes/sq. centimetre
Pressure & Stress
0.1
newtons/sq. metre, or pascals
Feet
Length
0.304 8
metres
Feet
Length
30.48
centimetres
feet of water
Pressure & Stress
0.3048
metres of water
feet/second
Velocity
0.304 8
metres/second
Gallons
Volume
4.546
litres
Gallons
Volume
4.546 x 10-3
cubic metres
Gallons/hour
Flow Rate
0.004 546
cubic metres/hour
Gallons/hour
Flow Rate
4.546
litres/hour
Gallons/hour
Flow Rate
1.263
millilitres/second
Gallons/minute
Flow Rate
0.272 8
cubic metres/hour
Gallons/minute
Flow Rate
0.075 77
litres/second
Gallons/minute
Flow Rate
4.546
litres/minute
Grains (gr)
Mass
0.064 80
grams
Grains/100 standard cubic feet
Concentration in Gas
23.32
milligrams/standard cubic metre
Horsepower
Power
0.745 7
kilowatts
Hundredweights
Mass
50.8
kilograms
Inches
Length
25.4
millimetres
Inches
Length
2.54
centimetres
Inches Hg (00C)
Pressure & Stress
33.86
millibars
Inches w.g. (40C)
Pressure & Stress
2.491
millibars
Kilogram-forcemetres
Moment of Force (Torque)
9.807
newton metres
Kilograms-force
Force
9.807
newtons
Kilograms-force/sq. millimetre
Pressure & Stress
9.807
newtons/sq. millimetre
Kilograms-force/sq. millimetre
Pressure & Stress
98.07
bars
Kilowatt hours
Heat
3.6
megajoules
Kilowatts
Heat Flow
3.6
megajoules/hour
Megajoules/hour
Heat Flow
0.277 8
kilowatts
Miles
Length
1.609 3
kilometres
miles/hour
Velocity
0.447 0
metres/second
miles/hour
Velocity
1.609
kilometres/hour
Millimetres w.g. (40C)
Pressure & Stress
0.098 07
millibars
MillimetresHg(00C)
Pressure & Stress
1.333
millibars
Ounces (avoir)
Mass
28.35
grams
Pints
Volume
0.5683
litres
pound-force feet
Moment of Force (Torque)
1.356
newton metres
Pounds (avoir)
Mass
0.453 6
kilograms
Pounds/106 standard cubic feet
Concentration in Gas
16.33
milligrams/standard cubic metre
Pounds/foot hour
Dynamic Viscosity
4.134 x 10-4
newton seconds/sq. metre
Pounds/foot hour
Dynamic Viscosity
0.413 4
centipoises
Pounds/hour
Flow Rate
0.453 6
kilograms/hour
Pounds/hour
Flow Rate
0.126
grams/second
Pounds-force
Force
4.448
newtons
Pounds-force/sq. inch
Pressure & Stress
0.068 95
bars
Pounds-force/sq. inch
Pressure & Stress
68.95
millibars
Square feet
Area
0.092 90
square metres
Square inches
Area
645.16
square millimetres
Square inches
Area
6.451 6
square centimetres
Standard atmospheres
Pressure & Stress
1.013 25
bars
Standard cubic feet, gas (30in Hg, 600F, sat)
Volume
0.027 78
standard cubic metres, gas (1013.25 mbar, 150C, dry)
Standard cubic feet/ hour (gas)
Flow Rate
0.027 78
standard cubic metres/hour (gas)
Temperature in 0C
Temperature Value Conversions
0C +273.15
Temperature in K
Temperature in 0F
Temperature Value Conversions
5/9(0F-32)
Temperature in 0C
Temperature in 0F
Temperature Value Conversions
5/9 (0F +459.67)
Temperature in K
Temperature in 0R
Temperature Value Conversions
5/9 0R=
Temperature in K
Therms
Heat
105.5
megajoules
Thous
Length
0.025 4
millimetres
tons (UK)
Mass
1.016
tonnes
tons (UK)
Mass
1016
kilograms
tons of refrigeration
Refrigeration
3.517
kilowatts
tons of refrigeration
Refrigeration
12.66
megajoules/hour
tons-force/sq. inch
Pressure & Stress
15.44
newtons/sq. millimetre
tons-force/sq. inch
Pressure & Stress
154.4
bars
Torrs
Pressure & Stress
1.333
millibars
Yards
Length
0.914 4
metres
Btu/h
Heat Flow
0.000293071
kW
Btu/h/ft3
Heat Flow Rate
0.01
kW/m3
KW
Heat Flow
3412.142
Btu/h
kW/m3
Heat Flow Rate
100
Btu/h/ft3
KWh
Heat
0.0341214
Therm
Pence/kWh
Heat
29.3071
Pence/therm
Pence/Therm
Heat
0.0341214
Pence/kWh
Therm
Heat
29.3071
kWh
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