Convert Kilojoules to Microjoules
Convert Kilojoules (kJ) to Microjoules (µJ) instantly and accurately.
Conversion Formula
µJ = kJ × 1000000000
About Kilojoules
A kilojoule (kJ) is exactly 1,000 J and is the standard energy unit for food and physical chemistry. EU, Australian, and NZ food labels are mandatory in kJ: recommended adult intake is ~8,400 kJ/day. Bond dissociation energies: C-H bond 413 kJ/mol; C=C double bond 614 kJ/mol; N≡N triple bond 945 kJ/mol. Specific heat of water: 4.184 kJ/(kg·K). A cyclist riding at 150 W for one hour expends 540 kJ. Charpy and Izod impact toughness tests record results in J and kJ. 1 kJ = 1,000 J = 239.0 cal = 0.94782 BTU = 0.27778 Wh.
About Microjoules
A microjoule (µJ) is 10⁻⁶ J - the scale of precision laser ablation, ESD damage events, and individual LIDAR pulses. LASIK eye surgery delivers 0.5-2 µJ per pulse at 193 nm, ablating ~0.25 µm of corneal tissue per pulse. ESD events that destroy IC gates correspond to 1-1,000 µJ; the Human Body Model test discharges ~500 µJ at 2 kV. Q-switched microchip laser pulses for rangefinding are 1-100 µJ. The kinetic energy of a 1 mg grain of sand falling 10 cm is mgh ≈ 0.98 µJ. 1 µJ = 10⁻⁶ J.
Quick Reference Table
| Kilojoules (kJ) | Microjoules (µJ) |
|---|---|
| 1 kJ | 1000000000 µJ |
| 2 kJ | 2 × 109 µJ |
| 5 kJ | 5 × 109 µJ |
| 10 kJ | 1 × 1010 µJ |
| 25 kJ | 2.5 × 1010 µJ |
| 50 kJ | 5 × 1010 µJ |
| 100 kJ | 1 × 1011 µJ |