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