How much load can a (wood) 4"x 6" handle with a span of 16' with supports only at the ends. I have a total of 6,200 load pounds on it.
There are wood load calculators online available to punch in the numbers: https://awc.org/codes-standards/calculators-software/spancalc That should give you the answer.
It depends on 1) species of wood, 2) grade of wood, 3) duration of load, 4) if used repetitively (like joists).
Typically, for SPF (spruce, pine, fir) with medium grading and permanently loaded, a 4x6 spanning 16’ can support about 1500 lbs. including the weight of the beam.
If it’s for a “short duration” (less than 2 months) you can increase it by 15%. If it’s “very short duration “ (less than 7 days), you can increase it by 25%. If it’s an “impact load” you can double it to about 3000 lbs.