We have already learned how to use: being on a diet, going on a diet, starting a diet and dieting here.

And we go on a diet because we are, or we believe we are fat. Hehe… Asking about someone’s weight, is a kinda serious and private question, but in case we still feel comfortable to do so, that’s how we can ask:

How much do you weigh?

I weigh … kg/ lbs.

or

What’s your weight?

My weight is … kg / lbs.

Watch the video and listen to more examples.