Convert Henries to Femtohenries
Convert Henries (H) to Femtohenries (fH) instantly and accurately.
Conversion Formula
fH = H × 1000000000000000
About Henries
The henry (H) is the SI derived unit of electrical inductance, equal to 1 volt-second per ampere (1 V·s/A = 1 Ω·s = 1 kg·m²·A⁻²·s⁻²), named after Joseph Henry (1797-1878). Mains-frequency (50/60 Hz) power transformers have primary inductances of 1-100 H; loudspeaker crossover woofer inductors are 1-5 mH; large power-line reactors are 0.1-10 H. 1 H = 10³ mH = 10⁶ µH.
About Femtohenries
The femtohenry (fH) equals 10⁻¹⁵ H, the scale for PCB via inductances, short bondwires, and on-chip spiral inductor parasitics in millimetre-wave design. A 0.5 mm gold bondwire has about 0.5-1 fH inductance at mm-wave frequencies; differential pair stubs in 100 GHz SerDes are modelled in femtohenries; Josephson junction loop inductances in superconducting circuits are a few hundred fH. 1 fH = 10⁻³ pH = 10⁻¹⁵ H.
Quick Reference Table
| Henries (H) | Femtohenries (fH) |
|---|---|
| 1 H | 1 × 1015 fH |
| 2 H | 2 × 1015 fH |
| 5 H | 5 × 1015 fH |
| 10 H | 1 × 1016 fH |
| 25 H | 2.5 × 1016 fH |
| 50 H | 5 × 1016 fH |
| 100 H | 1 × 1017 fH |