I'm also using the bathroom scales to weigh me and then me and the bike method. As our scales were cheap, I do this three times and average it out
I've not weighed either for a long while, but from memory:
Bike 1: Steel fully rigid MTB with drop bar conversion, rear rack, lights, mud guuards and empty bottle cage was about 14kg. With panniers full of work stuff (change of clothes, lock, laptop) and it's well over 20kg.
Bike 2: Steel Peugeot road bike c.1979. About 6 or 7kg from memory. Mind you it has no saddle, cranks, bar tape, chain or front derallieur. Must attend to that. I guess it will 12-13kg when rideable.