Energy 
1 KiloWatthour (kWh) 
= 
3.6 MegaJoules (MJ) 
1 KiloWatthour (kWh) 
= 
3412 British Thermal Units (BTU) 
1 KiloWatthour (kWh) 
= 
859.2 kilocalories (kcal) 
1 Joule (J) 
= 
1 Watt Second 
1 Joule (J) 
= 
1 NewtonMetre (Nm) 
1 Joule (J) 
= 
0.1026 MetreKilogram (mkg) 
1 Joule (J) 
= 
1 Volt X 1 Coulomb 
1 Joule (J) 
= 
6.24 x 10^{12 }Million electronVolts (MeV) 
1 ElectronVolt (eV) 
= 
1.6 X 10^{19} Joules (J) 
1 ElectronVolt (eV) 
= 
1.16 X 10^{4} Degrees Kelvin (K) Equivalent
(See Equivalent Electron Temperature below) 
1MeV 
= 
1.07 X 10^{3} amu (Mass to Energy Conversion) 
1 GigaJoule (GJ) 
= 
277.8 KiloWatthours (kWh) 
1 Calorie (cal) 
= 
4.19002 Joules (J) 
1 British Thermal Unit (BTU) 
= 
1055 Joules (J) 
1 Therm

=

100,000 BTU

1 Therm

=

29.3 kWh

1 Quadrillion BTU (Quad) 
= 
10^{15} BTU 
1 Quadrillion BTU (Quad) 
= 
2.931 x 10^{11} KiloWatthours (KWh) 
1 Quadrillion BTU (Quad) 
= 
293.1 TeraWatthours (TWh) 
1 Ton of Oil Equivalent (toe) 
= 
41.87 GigaJoules (GJ) 
1 Ton of Oil Equivalent (toe) 
= 
11.6 MegaWatthours (MWh) [See Note 1 below] 
1 Metric Ton of TNT 
= 
4.184 GigaJoules (GJ) 
1 Short Ton of TNT 
= 
3.796 GigaJoule (GJ) 
1 Ton of Oil Equivalent (toe) 
= 
10 Tons of TNT 
1 GigaWatthour (GWh) 
= 
86 Tons of Oil Equivalent (toe) 
1 TeraWatthour (TWh) 
= 
1 Billion KiloWatthours (KWh) 
Energy Density / Calorific Content 
1 KiloWatthour/Kilogram (kWh/Kg) 
= 
3.6 GigaJoules/tonne (GJ/tonne) 
Power 
1 Watt (W) 
= 
1 Joule/Second (J/s) 
1 Watt (W) 
= 
3.7 BTU per hour (BTU/h) 
1 Watt (W) 
= 
668 Lumens [See Note 2 below] 
1 kiloWatt (kW) 
= 
1000 Watts (W) 
1 MegaWatt (MW) 
= 
1000 kiloWatts (kW) [See Note 3 below] 
1 Horse Power (hp) 
= 
746 Watts (W) 
0 decibel (dB) 
= 
1 Power ratio (Note logarithmic scale) 
3 dB 
= 
2 Power ratio 
10 db 
= 
10 Power ratio 
1 milliWatt (mW) 
= 
0 dBm Relative power (Note logarithmic scale) 
100 milliWatts (mW) 
= 
20 dBm 
1 microWatt (µW) 
= 
30 dBm 
1 femto Watt (fW) 
= 
10^{15 }Watts 
Acceleration 
1 metre per second per second (m/s^{2}) 
= 
3.281 feet per second per second (ft/s^{2}) 
Gravitational Constant (G) (At the Earth's surface) 
9.80665 (m/s^{2}) 
= 
32.174 (ft/s^{2}) 
Weight 
1 Long Ton (UK) (t) 
= 
2240 Pounds (lb) 
1 Short Ton (US) (t) 
= 
2000 Pounds (lb) 
1 Metric Ton (t) 

2204.623 Pounds (lb) 
1 Kilogram (Kg) 
= 
2.2 Pounds (lb) 
1 Kilogram (Kg) 
= 
9.807 Newtons (N) On the Earth's surface 
1 Stone 
= 
6.35 Kilograms (Kg) 
1 Ounce (Oz) 
= 
28.35 Grams (g) 
1 Atomic Mass Unit (amu)

=

1.67377 X 10^{27} Kilogram (Kg)

1 Atomic Mass Unit (amu) 
= 
931.5 MeV (Mass to Energy Conversion)

Force 
1 Newton (N) 
= 
0.102 KilogramsForce (kgf) 
1 Newton (N) 
= 
0.22 PoundForce (lbf) 
1 Poundal 
= 
0.138 Newtons (N) 
1 Poundal 
= 
0.031 PoundForce (lbf) 
Torque 
1 NewtonMetre (N.M) 
= 
0.102 kilogramForce.Metres (kgf.m) 
1 NewtonMetre (N.M) 
= 
0.738 FootPoundsForce (ft.lbf) 
Electric Charge 
1 Coulomb (C) 
= 
1 AmpSecond 
1 Coulomb (C) 
= 
6.25 X 10^{18} Electrons (e) 
1 AmpHour (Ah) 
= 
3600 Coulombs (C) 
Electric Current 
1 Amp (A) 
= 
1 Coulomb per Second (C/s) 
1 Amp (A) 
= 
6.25 X 10^{18} Electrons per Second
Electron Flow 
Electric Voltage 
1 Volt (V) 
= 
1 Joule per Coulomb (J/C) 
Frequency / Wavelength 
1 MegaHertz (MHz) 
= 
300 metres (M) 
Flow Rate 
1 Litre per Second 
= 
792 Gallons (Imp) per Hour (gal/hr) 
Distance 
1 Mile 
= 
1.6 Kilometers (km) 
1 Metre (m) 
= 
39.4 Inches (in) 
1 Inch (in) 
= 
2.54 centimetres (cm) 
1 Thousandth of an Inch (thou) 
= 
25.4 Microns 
1 Micrometre (Micron) 
= 
10^{3 }(0.001) Millimetres (mm)

1 Nanometre 
= 
10^{6} Millimetres (mm) 
1 Angstrom

=

10^{7} Millimetres (mm)

Atomic Diameter

= 
1 Angstrom (Approximately)

1 Nautical Mile (nm) 
= 
1.1508 Miles (m) 
Area 
1 Square Metre (m^{2}) 
= 
10.76 Square Feet (sq.ft) 
1 Hectare (ha) 
= 
10,000 Square Metres (m^{2}) 
1 Hectare (ha) 
= 
2.47 Acres (acre) 
1 Acre (acre) 
= 
4840 Square Yards (sq yd) 
1 Square Mile (mile^{2}) 
= 
640 Acres (acre) 
1 Square Mile (mile^{2}) 
= 
2.59 Square Kilometres (km^{2}) 
1 Square Kilometre (km^{2}) 
= 
100 Hectares (ha) 
Nuclear Cross Section  barn (bn) 
= 
10^{28} m^{2} 
Volume 
1 Cubic Metre (m^{3}) 
= 
1,000 Litres (l) 
1 Litre (l) 
= 
1,000,000 (mm^{3}) 
1 Gallon (Imperial) (gal) 
= 
4.55 Litres (l) 
1 Gallon (Imperial) (gal) 
= 
1.2 Gallons (US) (gal) 
1 Barrel (US Oil) (bbl) 
= 
42 Gallons (US Liq) (gal) 
Velocity 
1 Metre per second (m/s) 
= 
2.24 miles per hour (mph) 
1 Mile per Hour (mph) 
= 
1.61 Kilometres per Hour (km/hr) 
1 Knot (knot) 
= 
1.15 Miles per Hour (mph) 
Rotational Speed 
1 Revolution per minute (rpm) 
= 
0.105 Radians per second (rad/sec) 
Pressure 
1 bar or atm (atmospheric pressure) 
= 
14.5 Pounds per Square Inch (psi) 
1 bar

=

100,000 Pascals (Pa)

1 Pound per Square Inch (psi) 
= 
6895 Newtons per Square Meter (N/m^{2}) 
1 Pascal (Pa) 
= 
1 Newton per Square Meter (N/m^{2}) 
1 Megapascal (MPa) 
= 
145 Pounds per Square Inch (psi) 
Fuel Consumption 
30 Miles per Gallon (Imperial)(mpg) 
= 
9.42 Litres/100 Kilometers (l/100km) 
Radiation Activity (Radiotiactive Decay) 
1 Becquerel (Bq) 
= 
Material quantity producing
1 Nuclear decays/second 
1 Curie (Ci) (Obsolete) 
= 
3.7 X 10^{10} Becquerel (Bq) 
Radiation Dose

1 Gray (Gy) 
= 
1 Joule/Kilogram (J/Kg) 
1 Radiation Absorbed Dose (rad)
(Obsolete) 
= 
0.01 Gray (Gy) 
1 Röntgen (R) (Obsolete) 
= 
258 X 10^{6}Coulombs per Kilogram of Air (C/Kg) 
1 Gray (Gy) 
= 
115 Röntgen (R) 
1 Sievert (Sv) 
= 
1 Gray X Q (Gy) [See Note 4 below] 
1 Röntgen Equivalent Man (rem) (Obsolete) 
= 
0.01 Sieverts (Sv) [See Note 4 below] 
Amounts 
Avogadros Number (N_{A}) 
= 
6.02214179 X 10^{23} 
1 Mole (n) 
= 
Contains ^{}N_{A} particles 
Other Equivalents

1 Metric Ton of Oil (ton) 
= 
7.64 Barrels (bbl) 