I measured mine recently, after noticing that most of them were seeming a bit heavy. I used a digital bathroom scale, accurate to 0.2lb, using the weigh-myself-then-weigh-myself-holding-the-bass method. In other words, it was all very scientific.
Tobias American 5 - this is my only factory-made bass, and while I don't know the body wood, I suspect maple. Nevertheless, it is (as you probably know) very ergonomic. Weight 10.8 lb.
ThumpyHollow - my earliest extant build, with a hollowed-out sapele body with a quilt maple cap, and a Carvin maple fretless neck. Pretty comfy, even at 10.2 lb.
Serendipity is a 5-string walnut/maple Warmoth Dinky P body with a homemade walnut fretless neck. Fairly comfy but a bit heavy at 11.0 lb.
The RayBird has a homemade body of ash/alder/korina and a maple StingRay copy neck. Even though it's a 'bird it balances fairly well due to lightweight tuners and an original BadAss bridge. Feels light at 10.0 lb.
The PentaBird is a completely homemade walnut and maple 5-string 'bird. Balance is fair, but it feels like a boat anchor at 11.8 lb.
The OctoBird is a completely homemade sapele/cherry/maple 8-string 'bird. Balance is fair, but it is tied with the PentaBird for heaviest at 11.8 lb.
The Tele is all-walnut (excepting the quilt-maple pickguard), but is the lightest of the bunch at 9.8 lb; I intentionally hollowed out everything I could under the pickguard, and used lightweight tuners and a 32" scale.
The PentaBird and OctoBird both use Schaller M4 tuners, which are not the lightest available, so I may switch them out at some point. Should help both the weight and the balance some.
After discovering how heavy the 'birds turned out, my next few builds (actually starting with the Tele) have light weight as a primary design factor. I have one body blank in my stash that was advertised as mahogany but is super-light, so I have my doubts; it will become the basis for a "build it as light as possible" fiver, using a Lace Aluma X-Bar pickup, Gotoh Res-O-Lites, and as much chambering as possible, including the neck (!!). Experimental, yes, but it might work!
I just turned 48, and am reasonably fit (despite being pathologically lazy), so the heavier basses don't bother me as much as they would others. But I'm not getting any younger either!