Convert Picojoules to Megajoules
Convert Picojoules (pJ) to Megajoules (MJ) instantly and accurately.
Conversion Formula
MJ = pJ × 1.000000000e-18
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 Megajoules
A megajoule (MJ) is 10⁶ J - the scale of fuel combustion in vehicles and kinetic energy of road traffic. Energy content: 1 L diesel ~34.9 MJ; 1 L petrol ~32.2 MJ. A 1,500 kg car at 100 km/h has KE = ½ × 1,500 × 27.78² ≈ 0.579 MJ; at 200 km/h it carries 2.31 MJ - explaining crash severity's quadratic speed dependence. A 60 kWh EV battery stores 60 × 3.6 = 216 MJ. Detonation of 1 kg TNT releases 4.184 MJ. Adults at rest metabolise ~6-9 MJ/day. 1 MJ = 10⁶ J = 239.0 kcal = 0.27778 kWh = 947.8 BTU.
Quick Reference Table
| Picojoules (pJ) | Megajoules (MJ) |
|---|---|
| 1 pJ | 1 × 10-18 MJ |
| 2 pJ | 2 × 10-18 MJ |
| 5 pJ | 5 × 10-18 MJ |
| 10 pJ | 1 × 10-17 MJ |
| 25 pJ | 2.5 × 10-17 MJ |
| 50 pJ | 5 × 10-17 MJ |
| 100 pJ | 1 × 10-16 MJ |