Convert Millijoules to Terajoules
Convert Millijoules (mJ) to Terajoules (TJ) instantly and accurately.
Conversion Formula
TJ = mJ × 1.000000000e-15
About Millijoules
A millijoule (mJ) is 10⁻³ J - the scale of surgical lasers, spark ignition, and the kinetic energy of small everyday objects. Nd:YAG lasers for ophthalmology and tattoo removal deliver 10-200 mJ per pulse. The minimum spark energy to ignite methane-air is ~0.29 mJ; an automotive spark plug discharges 30-60 mJ per cycle. A 2 g mosquito flying at 1 m/s has kinetic energy ½ × 0.002 × 1² = 1 mJ. Electrocautery monopolar pulses deliver 50-500 mJ to coagulate blood vessels. 1 mJ = 10⁻³ J = 0.2390 cal.
About Terajoules
A terajoule (TJ) is 10¹² J - the scale of nuclear yields in the kiloton range and large industrial accidents. One kiloton of TNT = 4.184 TJ; the Hiroshima bomb (15 kt) released ~62.8 TJ. The Halifax Explosion (1917) released ~3 TJ. A 500 MW coal plant consumes ~51.4 TJ/h of thermal input. Daily primary energy of Denmark is ~250-300 TJ; the UK ~3,800 TJ/day. A 1 GW nuclear reactor at 90% capacity factor generates ~77.7 TJ/day. 1 TJ = 10¹² J = 277,778 kWh = 277.78 MWh = 23.88 ktoe.
Quick Reference Table
| Millijoules (mJ) | Terajoules (TJ) |
|---|---|
| 1 mJ | 1 × 10-15 TJ |
| 2 mJ | 2 × 10-15 TJ |
| 5 mJ | 5 × 10-15 TJ |
| 10 mJ | 1 × 10-14 TJ |
| 25 mJ | 2.5 × 10-14 TJ |
| 50 mJ | 5 × 10-14 TJ |
| 100 mJ | 1 × 10-13 TJ |