When draining the kitchen sink water, the water backs up into the bath tub.
Have used drain cleaners in kitchen and bath tub both. Any ideas why water backs up into the tub?
Thanks, Wingz

Yes. At some point the tub drain and the kitchen sink drain meet. You've got a clog somewhere after that meeting point.

You need to snake that line and run it all the way to your stack.

If you're handy you can rent an electric snake from HomeDepot or a local tool rental place and run it yourself - or call a couple plumbers for estimates. In my area, plumbers snaking inside runs to the stack typically run around $125.

Thank you RickJ.. Wingz