# Seconds of Arc to Mils (NATO) Converter

Enter the angle in seconds of arc below to get the value converted to mils.

## Result in Mils:

1 arcsec = 0.004938 mil

Do you want to convert mils to seconds of arc?

## How to Convert Seconds of Arc to Mils

To convert a measurement in seconds of arc to a measurement in mils, multiply the angle by the following conversion ratio: 0.004938 mils/second of arc.

Since one second of arc is equal to 0.004938 mils, you can use this simple formula to convert:

mils = seconds of arc × 0.004938

The angle in mils is equal to the angle in seconds of arc multiplied by 0.004938.

For example, here's how to convert 500 seconds of arc to mils using the formula above.
mils = (500" × 0.004938) = 2.469136 mil

## What Is a Second of Arc?

The second of arc is a unit of angle equal to 1/60th of one minute of arc or 1/3,600 of one degree.

A second of arc is sometimes also referred to as an arc second or arcsecond. Seconds of arc can be abbreviated as arcsec, and are also sometimes abbreviated as asec. For example, 1 second of arc can be written as 1 arcsec or 1 asec.

The second of arc is most commonly expressed using a double prime (″), though a double quote is often used as well. For example, 1 second of arc is most often written as 1″.

## What Is a Mil?

A mil, short for milliradian, is equal to 1/6,400 of a circle. The mil used by the US military and NATO forces is slightly different than the true value of a milliradian, which is equal to 1/6,283 of a circle.

During World War I the US adopted what is now the NATO mil to replace degrees and minutes for use in artillery sights. They opted to round mils to 6,400 per circle for simplicity at the time. Today, the mil is commonly used to measure adjustment of sights and scopes of firearms.

There is rightfully much confusion as a result of the mil adopted by the US military and NATO being slightly different than the milliradian.

A mil is sometimes also referred to as an angular mil. Mils can be abbreviated as mil; for example, 1 mil can be written as 1 mil.

## Second of Arc to Mil Conversion Table

Table showing various second of arc measurements converted to mils.
Seconds Of Arc Mils (NATO)
1" 0.004938 mil
2" 0.009877 mil
3" 0.014815 mil
4" 0.019753 mil
5" 0.024691 mil
6" 0.02963 mil
7" 0.034568 mil
8" 0.039506 mil
9" 0.044444 mil
10" 0.049383 mil
20" 0.098765 mil
30" 0.148148 mil
40" 0.197531 mil
50" 0.246914 mil
60" 0.296296 mil
70" 0.345679 mil
80" 0.395062 mil
90" 0.444444 mil
100" 0.493827 mil
200" 0.987654 mil
300" 1.4815 mil
400" 1.9753 mil
500" 2.4691 mil
600" 2.963 mil
700" 3.4568 mil
800" 3.9506 mil
900" 4.4444 mil
1,000" 4.9383 mil