Kilonewton is 1000 newton units.
Kilonewtons to Femtonewtons Converter — kN to fN
Convert Kilonewton (kN) to Femtonewton (fN) using the exact conversion factor (1 kilonewton = 1e+18 femtonewton). See the formula, worked examples, and conversion table.
Kilonewtons to Femtonewtons converter
Converter
Force Converter
Convert newtons, dynes, pound-force, kilogram-force, kips, and ounce-force.
Context values
Some unit families need one extra value for a physically accurate result.
Femtonewton is 1e-15 newton units.
Result = input x 1000 / 1e-15.
Force uses the newton as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Kilonewtons to Femtonewtons
Kilonewton and Femtonewton both measure force, and the conversion matters whenever an SI-trained engineer needs to compare notes with a US-trained one, or vice versa. Specifically: Kilonewton is 1000 newton units, and femtonewton is 1e-15 newton units.
Formula
femtonewtons = kilonewtons × 1e+18
This factor comes from each unit's defined relationship to the category's base unit: 1 kilonewton equals 1000 base units, and 1 femtonewton equals 1e-15 base units, so dividing one by the other gives the direct kilonewton-to-femtonewton factor of 1e+18.
Simple example
1 kN × 1e+18 = 1e+18 fN
1 kilonewton = 1e+18 femtonewtons.
Real-world example
10 kN × 1e+18 = 1e+19 fN
10 kilonewtons = 1e+19 femtonewtons.
Conversion table
| Kilonewton (kN) | Femtonewton (fN) |
|---|---|
| 1 kN | 1e+18 fN |
| 5 kN | 5e+18 fN |
| 10 kN | 1e+19 fN |
| 50 kN | 5e+19 fN |
| 100 kN | 1e+20 fN |
| 1,000 kN | 1e+21 fN |
Reverse conversion: Femtonewton to Kilonewton
1e+18 fN × 1e-18 = 1 kN
1e+18 femtonewtons = 1 kilonewtons.
kilonewtons = femtonewtons × 1e-18
For a page dedicated to this direction, see Femtonewton to Kilonewton.
Understanding the Kilonewton (kN)
Kilonewton is 1000 newton units.
Understanding the Femtonewton (fN)
Femtonewton is 1e-15 newton units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtonewtons are in 1 kilonewton?
1 kilonewton equals 1e+18 femtonewtons, using the exact defined conversion factor rather than an estimate.
How do I convert kilonewton to femtonewton?
Multiply the kilonewton value by 1e+18. The converter above does this instantly to whatever precision you set.
How do I convert femtonewton back to kilonewton?
Use the reverse factor: 1 femtonewton equals 1e-18 kilonewtons. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilonewton?
Kilonewton (kN) is a unit of force.
What is a femtonewton?
Femtonewton (fN) is a unit of force.
Is the kilonewton to femtonewton conversion exact?
Yes. Both kilonewton and femtonewton are defined by fixed standards rather than physical artifacts, so the factor of 1e+18 used above is exact to as many digits as you choose to display.