Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 MJ | 0.947813 BTU | |
| 0.01 MJ | 9.47813 BTU | |
| 0.1 MJ | 94.7813 BTU | |
| 1 MJ | 947.813 BTU | |
| 5 MJ | 4739.07 BTU | |
| 10 MJ | 9478.13 BTU | |
| 50 MJ | 47390.7 BTU | |
| 100 MJ | 94781.3 BTU | |
| 1000 MJ | 947813 BTU |
Formula: BTU = Megajoule × 947.8
Multiply any megajoule value by 947.8 to get btu.
Reverse: Megajoule = BTU × 0.001055
Common megajoule values — factor: 1 MJ = 947.8 BTU
| Megajoule (MJ) | BTU (BTU) | Context |
|---|---|---|
| 0.001 MJ | 0.9478 BTU | 1 kJ |
| 0.01 MJ | 9.478 BTU | 10 kJ |
| 0.1 MJ | 94.78 BTU | 100 kJ |
| 1 MJ | 947.8 BTU | 1 MJ |
| 3.6 MJ | 3,412 BTU | 1 kWh |
| 10 MJ | 9,478 BTU | 10 kWh |
| 34 MJ | 3.223e+04 BTU | 1L petrol |
| 100 MJ | 9.478e+04 BTU | ~28 kWh |
| 360 MJ | 3.412e+05 BTU | 100 kWh |
| 1,000 MJ | 9.478e+05 BTU | ~278 kWh |
| 4,600 MJ | 4.36e+06 BTU | 1 tonne TNT |
| 1e+04 MJ | 9.478e+06 BTU | ~2.8 MWh |
| 1e+05 MJ | 9.478e+07 BTU | ~28 MWh |
| 1e+06 MJ | 9.478e+08 BTU | ~278 MWh |
| 1.000e+09 MJ | 9.478e+11 BTU | ~278 GWh |
1 MJ = 947.8 BTU. Memorize for instant estimates.
Use 947.8 as a quick mental multiplier.
Multiply result by 0.001055 to recover the original MJ value.
Measures fuel energy content — 1 liter of petrol ≈ 34 MJ.
Compares battery pack energy in MJ and kWh for range calculations.
Quantifies explosive yield — 1 kg TNT ≈ 4.6 MJ.
Calculates daily/annual energy yield of solar and wind in MJ.
Compares fuel energy costs across transport modes in MJ/km.
Models annual heating and cooling energy demand in MJ.
The megajoule (MJ) equals 1,000,000 joules and is used for large-scale energy measurements in engineering, transportation, and industrial processes.
One liter of petrol contains about 34 MJ of chemical energy. A bolt of lightning releases about 1-5 MJ. An adult's daily food intake is roughly 8-10 MJ. Electric vehicle batteries are typically rated at 40-100 MJ (11-28 kWh).
Interesting fact: The kinetic energy of a 1,000 kg car traveling at 100 km/h is about 0.385 MJ. TNT explosive releases about 4.6 MJ per kilogram when detonated.
The British Thermal Unit (BTU) is the traditional Imperial energy unit, defined as the heat required to raise 1 pound of water by 1°F. It equals 1,055.06 joules and has been used since the 19th century in heating, air conditioning, and gas billing.
BTU remains dominant in US HVAC: air conditioners and heaters are rated in BTU/hour. Natural gas is priced in therms (100,000 BTU) in the US. Furnaces are rated in BTU/hour output.
Interesting fact: A typical US home furnace is rated at 80,000–120,000 BTU/hour. One BTU is roughly the energy released by burning one kitchen match. The US natural gas pipeline system delivers about 25 quadrillion BTU (quads) per year.
Converting megajoule to btu is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 MJ = 4739 BTU and 10 MJ = 9478 BTU. Reverse: 1 BTU = 0.001055 MJ. Exact factor: 1 MJ = 947.8 BTU.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.