Convert Femtonewtons to Kilogram-Force
Convert Femtonewtons (fN) to Kilogram-Force (kgf) instantly and accurately.
Conversion Formula
kgf = fN × 1.019716213e-16
About Femtonewtons
A femtonewton (fN) is 10⁻¹⁵ N - the force scale of single-molecule biology. RNA polymerase exerts a stall force of ~14-25 fN while transiting DNA at 10-50 bp/s. Myosin V motor proteins step 37 nm with ~1-3 fN per head. The viscous drag on a 100 nm nanoparticle moving at 1 µm/s through cytoplasm is ~0.2-0.5 fN. Optical tweezers with back-focal-plane detection resolve sub-femtonewton forces, enabling measurement of single-enzyme output. AFM receptor-ligand unbinding (e.g., biotin-streptavidin) gives adhesion forces of 100-300 fN. 1 fN = 10⁻¹⁵ N.
About Kilogram-Force
The kilogram-force (kgf), also called the kilopond (kp), is the gravitational force on 1 kg under standard gravity - exactly 9.80665 N. It was the primary force unit in continental European engineering before SI. ISO 1000 (1973) and EU Directive 80/181/EEC deprecated it in favour of the newton. Spring and bathroom scales reading in 'kg' technically measure kgf. Older DIN and JIS materials standards give tensile strength in kgf/mm² (× 9.80665 = MPa). Hydraulic cylinder ratings in legacy European machinery use kgf or tonne-force. 1 kgf = 9.80665 N = 2.20462 lbf.
Quick Reference Table
| Femtonewtons (fN) | Kilogram-Force (kgf) |
|---|---|
| 1 fN | 1.02 × 10-16 kgf |
| 2 fN | 2.039 × 10-16 kgf |
| 5 fN | 5.099 × 10-16 kgf |
| 10 fN | 1.02 × 10-15 kgf |
| 25 fN | 2.549 × 10-15 kgf |
| 50 fN | 5.099 × 10-15 kgf |
| 100 fN | 1.02 × 10-14 kgf |