Did I do this right?

Trying to calculate actual mRad of my laser.

Initial diameter of beam: 1/8 of an inch ~3.17mm
Final diameter of beam: 7/8 of an inch ~22.225mm
Distance: 33.5 feet ~1021cm

My calculated mRad: 1.0689

It seems a little low for the actual size of the beam but that may just be because it starts off thicker. Thanks guys.

Hmm,... I get about 1.8-1.9mRad using your measurements above and this divergence calculator:
pseudonomen137's JScript mRad Calculator

Ash said:

Hmm,... I get about 1.8-1.9mRad using your measurements above and this divergence calculator:
pseudonomen137's JScript mRad Calculator

Click to expand...

Oh okay that makes a lot more sense. I didn't have a calculator I used the equation on the skylasers site:

mRad = 2 * arctan ( (Df - Di) / 2L )

Thanks!