Convert Millijoules to Petajoules
Convert Millijoules (mJ) to Petajoules (PJ) instantly and accurately.
Conversion Formula
PJ = mJ × 1.000000000e-18
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 Petajoules
A petajoule (PJ) is 10¹⁵ J - the national energy policy scale. IEA reports primary energy in PJ/year: Sweden ~600 PJ; Germany ~12,500 PJ; the United States ~93,000 PJ. World total primary energy supply is ~605,000 PJ = 605 EJ. The 1883 Krakatoa eruption released ~200 PJ ≈ 48 megatons TNT. A 1-megaton nuclear weapon releases 4.184 PJ. Global annual steel production embeds ~38,000-47,000 PJ of energy. 1 PJ = 10¹⁵ J = 277.78 GWh = 238.85 ktoe = 23.88 ktoe.
Quick Reference Table
| Millijoules (mJ) | Petajoules (PJ) |
|---|---|
| 1 mJ | 1 × 10-18 PJ |
| 2 mJ | 2 × 10-18 PJ |
| 5 mJ | 5 × 10-18 PJ |
| 10 mJ | 1 × 10-17 PJ |
| 25 mJ | 2.5 × 10-17 PJ |
| 50 mJ | 5 × 10-17 PJ |
| 100 mJ | 1 × 10-16 PJ |