Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 J | 1e-09 MJ | |
| 0.01 J | 1e-08 MJ | |
| 0.1 J | 1e-07 MJ | |
| 1 J | 1e-06 MJ | |
| 5 J | 5e-06 MJ | |
| 10 J | 1e-05 MJ | |
| 50 J | 5e-05 MJ | |
| 100 J | 0.0001 MJ | |
| 1000 J | 0.001 MJ |
Formula: Megajoule = Joule × 1.0000e-6
Multiply any joule value by 1.0000e-6 to get megajoule.
Reverse: Joule = Megajoule × 1e+06
Common joule values — factor: 1 J = 1.0000e-6 MJ
| Joule (J) | Megajoule (MJ) | Context |
|---|---|---|
| 0.001 J | 1.000e-09 MJ | 1 mJ |
| 0.1 J | 1.000e-07 MJ | Heartbeat |
| 1 J | 1.000e-06 MJ | Lift apple 10cm |
| 4.184 J | 4.184e-06 MJ | 1 calorie |
| 100 J | 1.000e-04 MJ | Sprinting 1 sec |
| 1,000 J | 0.001 MJ | 1 kJ |
| 4,184 J | 0.004184 MJ | 1 kcal food |
| 1e+04 J | 0.01 MJ | 10 kJ |
| 1e+05 J | 0.1 MJ | 100 kJ |
| 1.055e+06 J | 1.055 MJ | 1 BTU |
| 3.6e+06 J | 3.6 MJ | 1 kWh |
| 1e+08 J | 100 MJ | ~100 MJ |
| 1.000e+09 J | 1,000 MJ | 1 GJ |
| 1.000e+12 J | 1e+06 MJ | 1 TJ |
| 1.000e+15 J | 1.000e+09 MJ | 1 PJ |
1 J = 1.0000e-6 MJ. Memorize for instant estimates.
Use 1.0000e-6 as a quick mental multiplier.
Multiply result by 1e+06 to recover the original J value.
Uses joules as the SI unit for all energy, work, and heat calculations.
Calculates kinetic energy, potential energy, and work in joules.
Measures reaction enthalpies, bond energies, and heat of solution in joules.
Converts between power (watts) and energy (joules = watt-seconds).
Measures fracture energy and impact resistance in joules.
Applies the first law of thermodynamics with energy in joules.
The joule is the SI derived unit of energy, work, and heat, defined as the energy transferred when a force of one newton moves an object one meter. It was named after James Prescott Joule, the English physicist who established the mechanical equivalent of heat in the 1840s.
The joule is universal in physics and engineering: kinetic energy (½mv²), potential energy (mgh), electrical energy (VIt), and heat are all measured in joules. One joule is the energy needed to lift a 100g apple one meter against gravity.
Interesting fact: The human heart expends about 1 joule of energy with each beat. A 60-watt light bulb uses 60 joules every second. The entire energy released by a 1-megaton nuclear weapon equals about 4.18 × 10¹⁵ joules.
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.
Converting joule to megajoule 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 J = 5.0000e-6 MJ and 10 J = 1.0000e-5 MJ. Reverse: 1 MJ = 1e+06 J. Exact factor: 1 J = 1.0000e-6 MJ.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.