One ounce-force is exactly 278.013851 millinewtons, so converting ounces-force to millinewtons is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
Used for small springs, switches and haptic actuators. One thousandth of a newton — the range of surface tension and small actuators.
Mass is not force. A kilogram is a mass; a kilogram-force is the weight of that mass at standard gravity, 9.80665 N. Bathroom scales blur the distinction because they are calibrated for Earth; engineering calculations cannot. Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into millinewtons, which is usually more useful than the bare number.
The formula
ounces-force- The amount you are converting, in ounces-force
278.013850954- The exact number of millinewtons in one ounce-force
millinewtons- The converted result
How it works, step by step
- Enter the value in ounces-force.
- It is multiplied by 278.013850954, the exact factor between the two units.
- The answer is shown in millinewtons, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A climbing rope’s rated load: 7.91e+04 ozf in millinewtons
A climbing rope’s rated load comes to about 7.91e+04 ozf. Multiplying by the factor: 7.91e+04 × 278.014 = 2.19909e+07 mN. Dividing the answer back by 278.014 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A car’s braking force: 2.88e+04 ozf in millinewtons
A car’s braking force comes to about 2.88e+04 ozf. Multiplying by the factor: 2.88e+04 × 278.014 = 8.0068e+06 mN. Dividing the answer back by 278.014 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many millinewtons are in one ounce-force?
Exactly 278.013850954. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert ounces-force to millinewtons?
millinewtons = ounces-force × 278.013850954. Reversed, ounces-force = millinewtons ÷ 278.013850954, which is the same as multiplying by 0.0035969430896.
Which is the bigger unit, the ounce-force or the millinewton?
The ounce-force. One ounce-force equals 278.014 millinewtons.
What does this quantity actually measure?
Both units measure force. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a ounce-force?
Used for small springs, switches and haptic actuators.
What is a millinewton?
One thousandth of a newton — the range of surface tension and small actuators.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do ozf to mN in my head?
Plenty of people do this in their head: multiply by 280 instead of using the exact factor 278.013851. At 100 that shortcut gives 28,000 millinewtons, off by 198.6 millinewtons or about 0.71%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Ounces-Force to millinewtons reference tables
| Ounces-Force | Millinewtons |
|---|---|
| 0.5 ozf | 139.007 mN |
| 1 ozf | 278.014 mN |
| 2 ozf | 556.028 mN |
| 3 ozf | 834.042 mN |
| 5 ozf | 1390.07 mN |
| 10 ozf | 2780.14 mN |
| 20 ozf | 5560.28 mN |
| 25 ozf | 6950.35 mN |
| 50 ozf | 13,900.7 mN |
| 75 ozf | 20,851 mN |
| 100 ozf | 27,801.4 mN |
| 250 ozf | 69,503.5 mN |
| 500 ozf | 139,007 mN |
| 1000 ozf | 278,014 mN |
| 5000 ozf | 1.39007e+06 mN |
Exact factor: 1 ounce-force = 278.013850954 millinewtons.
| Quantity | ozf | mN |
|---|---|---|
| A sheet of paper’s weight | 0.1763 ozf | 49 mN |
| Lifting a bag of sugar | 35.29 ozf | 9810 mN |
| A firm handshake | 1079 ozf | 3e+05 mN |
| An adult’s body weight | 2806 ozf | 7.8e+05 mN |
| A climbing rope’s rated load | 7.913e+04 ozf | 2.2e+07 mN |
| A car’s braking force | 2.878e+04 ozf | 8e+06 mN |
Published reference values, converted with the same factor this page uses.