how can i find out the weight of my bike?

Well, the idea of weighing you and your bike as a whole to then make the maths, it's not bad, however, due to your normal muscular tension and clothes -unless you're fully naked-, will produce a considerable inaccuracy...
As other person suggested, taking your bike to the bike-shop and determine its weight by hanging it will be the best option... also you can take it to laundry to hang it, but it will be sort of difficult to lift the bike, and if ith weighs over 35 pounds might be to much for a small machine.
Even better, you can google your bike brand and model, and its weight should appear in its specs, unless it's a bike made piece by piece of course...
Good luck.
 
Weigh yourself, then weigh yourself while holding the bike. The difference between those two results is the weight of the bike.
 
stand on a scale and weigh yourself. then stand on a scale holding your bike as steady as you can and in the center fo your body not on the side. then take away your weight from you and your bikes weight and it will tell you how much your bike weighs.

e.g. weight =65kg
weight + bike = 78kg
so weight of bike must = 78-65
=13kg
 
stand on a scale and weigh yourself. then stand on a scale holding your bike as steady as you can and in the center fo your body not on the side. then take away your weight from you and your bikes weight and it will tell you how much your bike weighs.

e.g. weight =65kg
weight + bike = 78kg
so weight of bike must = 78-65
=13kg
 
Take it to the bike shop. My local shop has an old hanger scale. They were used to weigh big slaps of meat, anything you need to hang from a hook. Theirs probably haven't gone over 30 pounds in 15 years. They sell all road bikes and work on only road bikes. Anyway some shops can accurately weigh bikes.
 
Weigh the bike as assembled?

Get on the scale with the bike as suggested. Try a bike shop -- the private owned shop. They have new bike scales too, not just the old meat scales.
 
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