Zeptonewton is 1e-21 newton units.
Zeptonewtons to Millinewtons Converter — zN to mN
Convert Zeptonewton (zN) to Millinewton (mN) using the exact conversion factor (1 zeptonewton = 1e-18 millinewton). See the formula, worked examples, and conversion table.
Zeptonewtons to Millinewtons 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.
Millinewton is 0.001 newton units.
Result = input x 1e-21 / 0.001.
Force uses the newton as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Zeptonewtons to Millinewtons
Zeptonewton and Millinewton 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 millinewton is 0.001 newton units.
Formula
millinewtons = zeptonewtons × 1e-18
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptonewton equals 1e-21 base units, and 1 millinewton equals 0.001 base units, so dividing one by the other gives the direct zeptonewton-to-millinewton factor of 1e-18.
Simple example
1 zN × 1e-18 = 1e-18 mN
1 zeptonewton = 1e-18 millinewtons.
Real-world example
10 zN × 1e-18 = 1e-17 mN
10 zeptonewtons = 1e-17 millinewtons.
Conversion table
| Zeptonewton (zN) | Millinewton (mN) |
|---|---|
| 1 zN | 1e-18 mN |
| 5 zN | 5e-18 mN |
| 10 zN | 1e-17 mN |
| 50 zN | 5e-17 mN |
| 100 zN | 1e-16 mN |
| 1,000 zN | 1e-15 mN |
Reverse conversion: Millinewton to Zeptonewton
1e-18 mN × 1e+18 = 1 zN
1e-18 millinewtons = 1 zeptonewtons.
zeptonewtons = millinewtons × 1e+18
For a page dedicated to this direction, see Millinewton to Zeptonewton.
Understanding the Zeptonewton (zN)
Zeptonewton is 1e-21 newton units.
Understanding the Millinewton (mN)
Millinewton is 0.001 newton units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millinewtons are in 1 zeptonewton?
1 zeptonewton equals 1e-18 millinewtons, using the exact defined conversion factor rather than an estimate.
How do I convert zeptonewton to millinewton?
Multiply the zeptonewton value by 1e-18. The converter above does this instantly to whatever precision you set.
How do I convert millinewton back to zeptonewton?
Use the reverse factor: 1 millinewton equals 1e+18 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 millinewton?
Millinewton (mN) is a unit of force.
Is the zeptonewton to millinewton conversion exact?
Yes. Both zeptonewton and millinewton 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.