keep this for future reference
Subtract the curb weight from the GVWR to find the payload capacity. For example, if you have a light-duty truck with a GVWR of 9,000 pounds and a curb weight of 6,000 pounds, the payload capacity will be 3,000 pounds: GVWR – curb weight = payload capacity.
This is good information...but unless you are going to a scale...not going to help.
You would look in your door jamb...and the info is right there.
Just look in the door jamb.
Now if you want to get an idea what the base weight of your truck from the factory is
take the numbers in the door jamb and enter them and you will get your base weight.
If you added equipment this will obviously be more.
Weighmytruck.com is the best app you can get. Go pay the 12 bucks and then you know. You will then also know your exact axle weights...and then you can cheat a bit more payload out from the stated number on your door...by using the axle capacities. But understand, stopping, turning and acceleration will be affected