Calculate the amount of studs and plates needed for framing a stud wall.
Quite often you need an engineering degree to use some of the available calculators.
Walls can be framed with studs placed at various distances. Most commonly used distances for stud placing in a wall are 16", 19.2" and 2' on centres (OC). I rarely use the 19.2" and either go with 16" or 24" OC stud placing. The stud placings are based on the lengths of sheathing materials that you may use.
With the recent code changes, 2015 comes to mind, to meet required insulation standards, you best bet is to frame your wall at 2' OC.
Most likely your wall will be part of more walls. In that case your first wall would require a corner stud on each end and subsequent walls would have a corner on one end to provide backing for internal finishing. A corner is made up out of two studs nailed together in an L.
If there is any wall that is partitioned of your external wall that would require additional. We use to frame these partitions out of 3 studs. Make a corner and nail an additional stud creating a U shaped box. This makes it impossible to insulate the created cavity. Then for a while we would make a corner out of 2 studs with the returning stud made out of a wider material than the partition wall, providing backing on both sides for finishing and leaving the cavity accessible for insulating purposes. Again with the updated building code requirements now you are better of nailing horizontal blocks across two studs where the partition wall needs to be. The less wood exposed to the exterior layer will reduce the thermal loss of heat.
Plates are the members in a wall that hold studs in place. The bottom plate is a single layer and the upper plate consists out of 2 layers.
Lay out your wall by tacking two plates together so they can't move and mark out the first corner. Then proceed by hooking your measuring tape over the end of the plates, marking the first stud 3/4" less than your required spacing. From there on continue your layout from this mark at the required OC.