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
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
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 units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilonewtons to Femtonewtons
Kilonewton and Femtonewton both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. 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
100 kN × 1e+18 = 1e+20 fN
100 kilonewtons = 1e+20 femtonewtons.
Conversion table
| Kilonewton (kN) | Femtonewton (fN) |
|---|---|
| 1 kN | 1e+18 fN |
| 10 kN | 1e+19 fN |
| 50 kN | 5e+19 fN |
| 100 kN | 1e+20 fN |
| 500 kN | 5e+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 engineering.
What is a femtonewton?
Femtonewton (fN) is a unit of engineering.
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.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.