Convert Nanojoules to Millijoules
Convert Nanojoules (nJ) to Millijoules (mJ) instantly and accurately.
Conversion Formula
mJ = nJ × 1.000000000e-6
About Nanojoules
A nanojoule (nJ) is 10⁻⁹ J - the scale of ultrashort laser pulses, flash memory write operations, and cellular ATP reserves. A Ti:sapphire laser oscillator produces pulses of 1-20 nJ at 80 MHz. Flash NAND programming costs ~1-10 nJ/bit written; a read is ~0.1 nJ/bit. The total ATP energy stored in a single red blood cell is ~1-5 nJ. The kinetic energy of a 1 µg particle at 1.4 m/s is ~1 nJ, illustrating that nanojoules describe real nanoscale mechanical events. 1 nJ = 10⁻⁹ J.
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
| Nanojoules (nJ) | Millijoules (mJ) |
|---|---|
| 1 nJ | 1 × 10-6 mJ |
| 2 nJ | 2 × 10-6 mJ |
| 5 nJ | 5 × 10-6 mJ |
| 10 nJ | 1 × 10-5 mJ |
| 25 nJ | 2.5 × 10-5 mJ |
| 50 nJ | 5 × 10-5 mJ |
| 100 nJ | 1 × 10-4 mJ |