MRAD vs. inches vs. MOA

[Mike300wby]

Please check my sanity.

If my app said the bullet needs to come up 425inches at 1200 yards then this would be 9.8 MRAD and 33.8 MOA?

I am using (drop in inches/3.6)/(distance in yds/100). = MRAD

Is this correct?


Thanks!

 

[sp6x6]

Your moa off

 

[rammac]

For MOA just divide the range in yards by the number of inches in 1 MOA at the target's range. In this case 425/12 = 35.4 MOA.

Or, multiply the number of MILs by 3.6.
3.6 x 9.8 = 35.3.

For your MIL calculation you could have made it simpler by dividing the inches of drop by the number of inches in a MIL at 1200 yards.

1 MIL at 100 yards is approx 3.6 inches, multiply that by the number of yards in hundreds of yards
12 x 3.6 = 43.2 inches per MIL at 1200 yards.

Divide the drop by the number of inches per MIL at 1200 yards
425/ 43.2 = 9.8 MILs.

 

[Mike300wby]

My software iStrelok gives me these numbers also. Sp6x6, What did you get for MOA? I want to see where I am off.

 

[Mike300wby]

Sp6x6, someone else has provided the math, thanks!

 

[Tangent]

Use the arc tangent function.

MOA=33.819

MRAD=9.8376

 

[Tangent]

For MOA just divide the range in yards by the number of inches in 1 MOA at the target's range. In this case 425/12 = 35.4 MOA.

Or, multiply the number of MILs by 3.6.
3.6 x 9.8 = 35.3.

For your MIL calculation you could have made it simpler by dividing the inches of drop by the number of inches in a MIL at 1200 yards.

1 MIL at 100 yards is approx 3.6 inches, multiply that by the number of yards in hundreds of yards
12 x 3.6 = 43.2 inches per MIL at 1200 yards.

Divide the drop by the number of inches per MIL at 1200 yards
425/ 43.2 = 9.8 MILs.

No, your math is all wrong.

 

[Mike300wby]

My vortex manual was saying 1mrad = 3.44MOA or 3.6 inches/100yds.

So 9.8MRAD x 3.44 = 33.7MOA.

Is the difference the rounding up or down?

 

[Tangent]

My vortex manual was saying 1mrad = 3.44MOA or 3.6 inches/100yds.

So 9.8MRAD x 3.44 = 33.7MOA.

Is the difference the rounding up or down?

Yes, the discrepancy is from rounding. The numbers I posted are not from using an approximated conversion.

Below is how you actually determine the angle:
Arctangent (425/43,200)

 

[sp6x6]

Yes and I had moa off value,I shoot mils.Good to know process,but I rely on my app.But I shot drop card for years and still carry.I have my round mils in my head use same rifle last ten years,out to 1000

 

[dfanonymous]

The drop is to moa is more or less correct.

moa to mils IS=Milsx3.438
In this case it's 33.6

moa to mils= moa/3.438. Practical way for doing it.

 

[Tangent]

The drop is to moa is more or less correct.

moa to mils IS=Milsx3.438
In this case it's 33.6

moa to mils= moa/3.438. Practical way for doing it.

Those numbers get you where you need to go for all practical purposes, but those conversions are rounded as well.

 

[rammac]

No, your math is all wrong.

 

[Tangent]

I agree - your long, drawn out answer based on a complete misunderstanding of very basic math was pretty funny. What was even funnier is that you "converted" inches to MOA completely wrong, then you used a totally wrong conversion factor from MOA to mils and ended up with the right number, LOL.

Although it is a funny post, you'd do everyone a favor to delete or edit it since it's full of bad information.