Zeptonewton is 1e-21 newton units.
Zeptonewtons to Femtonewtons Converter — zN to fN
Convert Zeptonewton (zN) to Femtonewton (fN) using the exact conversion factor (1 zeptonewton = 1e-6 femtonewton). See the formula, worked examples, and conversion table.
Zeptonewtons 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 1e-21 / 1e-15.
Force units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Zeptonewtons to Femtonewtons
Zeptonewton 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: Zeptonewton is 1e-21 newton units, and femtonewton is 1e-15 newton units.
Formula
femtonewtons = zeptonewtons × 1e-6
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptonewton equals 1e-21 base units, and 1 femtonewton equals 1e-15 base units, so dividing one by the other gives the direct zeptonewton-to-femtonewton factor of 1e-6.
Simple example
1 zN × 1e-6 = 1e-6 fN
1 zeptonewton = 1e-6 femtonewtons.
Real-world example
100 zN × 1e-6 = 0.0001 fN
100 zeptonewtons = 0.0001 femtonewtons.
Conversion table
| Zeptonewton (zN) | Femtonewton (fN) |
|---|---|
| 1 zN | 1e-6 fN |
| 10 zN | 0.00001 fN |
| 50 zN | 0.00005 fN |
| 100 zN | 0.0001 fN |
| 500 zN | 0.0005 fN |
| 1,000 zN | 0.001 fN |
Reverse conversion: Femtonewton to Zeptonewton
0.000001 fN × 1000000 = 1 zN
0.000001 femtonewtons = 1 zeptonewtons.
zeptonewtons = femtonewtons × 1000000
For a page dedicated to this direction, see Femtonewton to Zeptonewton.
Understanding the Zeptonewton (zN)
Zeptonewton is 1e-21 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 zeptonewton?
1 zeptonewton equals 1e-6 femtonewtons, using the exact defined conversion factor rather than an estimate.
How do I convert zeptonewton to femtonewton?
Multiply the zeptonewton value by 1e-6. The converter above does this instantly to whatever precision you set.
How do I convert femtonewton back to zeptonewton?
Use the reverse factor: 1 femtonewton equals 1,000,000 zeptonewtons. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptonewton?
Zeptonewton (zN) is a unit of engineering.
What is a femtonewton?
Femtonewton (fN) is a unit of engineering.
Is the zeptonewton to femtonewton conversion exact?
Yes. Both zeptonewton and femtonewton are defined by fixed standards rather than physical artifacts, so the factor of 1e-6 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.