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
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 1e-21 / 1e-15.
Force uses the newton as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Zeptonewtons to Femtonewtons
Zeptonewton 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: 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
10 zN × 1e-6 = 0.00001 fN
10 zeptonewtons = 0.00001 femtonewtons.
Conversion table
| Zeptonewton (zN) | Femtonewton (fN) |
|---|---|
| 1 zN | 1e-6 fN |
| 5 zN | 0.000005 fN |
| 10 zN | 0.00001 fN |
| 50 zN | 0.00005 fN |
| 100 zN | 0.0001 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 force.
What is a femtonewton?
Femtonewton (fN) is a unit of force.
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.