Hehe... well, do you have an airline feeding you the performance data? ;) Seriously, it's all a matter of how far you want to go with this in your flight sim hobby. Maybe not that much in the beginning, then later you might want to go deeper and learn more about the technicalities and details.  

 

However, I think you will be fine without doing the the calculations, buddy.

You are right i do want to get to know all of that so i don't mind really. I use topcat and pfpx which are pretty good. For what i have learn't in 3 months kinda impressed lol

If you didn't have company-provided you would. But for the ease of day-to-day operations, no you don't do this in airline world.

 

Airlines typically know what places they fly to and will have everything ready to go for the crews. The dispatcher would look at the weather and the runway and say, "Flight 590, you're okay to fly at 170,00 pounds from runway 21 at International Regional Express Airport."

 

You'd take a look at the temps and weather once you get your final weights to make sure you're still good to go at 170,000.

Thanks for that spin much appreaciated :D

When I took the flight dispatch course, we were issued six flight plans to do for the Boeing 737-800 (and our weights were in kilograms). For additional practice, since repeating the same six flight plans over and over again would result in me just filling in numbers without actually looking to make sure I knew why I got those numbers, I did flight plans for the Boeing 747-400 and flew them. In that scenario, I did check to make sure I was within weight limitations for that runway.