Okay. I thought, from your post, that you’d already done all the calculations and just wanted to confirm the results. What is in your spreadsheet, then?
I got a very good laser distance meter, but it is useless outside in the sun, or even on a cloudy day, for distances over 30-50’.
As to the math, you might want to take a look at my thread here: A Beginners Guide on Understanding and Using ALL THOSE ***** NUMBERS!
To include /all/ variables, you’ll also need to add slope/sun factors, efficiency factor, etc. but it’s a good start.