Convert Femtojoules to Joules
Convert Femtojoules (fJ) to Joules (J) instantly and accurately.
Conversion Formula
J = fJ × 1.000000000e-15
About Femtojoules
A femtojoule (fJ) is 10⁻¹⁵ J - the scale of gamma-ray photons, molecular motor work, and state-of-the-art digital logic. The electron rest-mass energy is 81.87 fJ; a 100 keV X-ray photon carries 16.02 fJ. A single myosin II motor protein power stroke dissipates ~5-40 fJ. ATP hydrolysis under cellular conditions yields ~80-100 fJ of free energy. Advanced 3 nm CMOS gates switch at ~0.1-1 fJ per operation. Ultrafast fiber laser oscillators produce pulses of 0.1-10 fJ before amplification. 1 fJ = 10⁻¹⁵ J = 6.242 keV.
About Joules
The joule (J) is the SI unit of energy, defined as one newton acting through one metre (1 J = 1 N·m = 1 kg·m²/s²). Named after James Prescott Joule, whose 1840s paddle-wheel experiments established the mechanical equivalent of heat (~4.15 J = 1 calorie). One joule is modest: it lifts a 100 g apple by 1 m, heats 0.239 mL of water by 1°C, or powers a 1 W LED for 1 second. Daily adult resting metabolism is ~6-9 MJ. 1 J = 1 W·s = 0.23901 cal = 9.4782 × 10⁻⁴ BTU = 2.7778 × 10⁻⁷ kWh.
Quick Reference Table
| Femtojoules (fJ) | Joules (J) |
|---|---|
| 1 fJ | 1 × 10-15 J |
| 2 fJ | 2 × 10-15 J |
| 5 fJ | 5 × 10-15 J |
| 10 fJ | 1 × 10-14 J |
| 25 fJ | 2.5 × 10-14 J |
| 50 fJ | 5 × 10-14 J |
| 100 fJ | 1 × 10-13 J |