Convert Picojoules to Millijoules
Convert Picojoules (pJ) to Millijoules (mJ) instantly and accurately.
Conversion Formula
mJ = pJ × 1.000000000e-9
About Picojoules
A picojoule (pJ) is 10⁻¹² J - the scale of laser pulses in scientific instruments and chip-level capacitor storage. A 1 pF capacitor charged to 1 V stores exactly 0.5 pJ. Laser pulse energies in OCT and ultrafast spectroscopy are typically 1-1,000 pJ. Single-photon SNSPD detector dead-time dissipates 1-100 pJ per event. Phase-change memory cells (PCM, ReRAM) switch at 10-100 pJ per state transition, setting a lower bound on non-volatile memory energy efficiency. 1 pJ = 10⁻¹² J = 6.242 MeV.
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.
Quick Reference Table
| Picojoules (pJ) | Millijoules (mJ) |
|---|---|
| 1 pJ | 1 × 10-9 mJ |
| 2 pJ | 2 × 10-9 mJ |
| 5 pJ | 5 × 10-9 mJ |
| 10 pJ | 1 × 10-8 mJ |
| 25 pJ | 2.5 × 10-8 mJ |
| 50 pJ | 5 × 10-8 mJ |
| 100 pJ | 1 × 10-7 mJ |