Usually once a week at my gym.
Daily, just to keep on track. Still have those same three pounds to lose, but as long as I’m within 3-5 of my goal, I can live with it.
Maybe a few times a month. I used to do it whenever I went to the gym. Not much point–I’m pretty thin and most people, like my family, get kind of freaked out when I talk about my weight, or worrying about it.
Weekly, to keep track of my weight loss programme. I didn’t weight myself for a long time, and it’s much easier to be in denial of weight creep when you don’t keep track.
Never.
When I was losing my comfort/marriage weight, I was weighing myself about twice daily. Silly, I know, but I couldn’t help it. It was like the scale was drawing me in. Now maybe once a week or every other week.
10-15 times a year.
About once a year. Not for any particular reason, but sometimes there’s a scale and I step on it out of mild curiosity.
My doctor weighs me when I see him every 6 months. I don’t own scales. Years ago when I did have bathroom scales I never used them.
Twice a week, every Monday and Thursday morning, right out of the shower, so that I have a baseline to keep track. I’m 6’ 2" and my weight is usually 190 or so. If it goes much higher than that, I eat a little less and exercise (or try to) a little more. If it goes lower than that, I treat myself to an extra dessert. 
Last time was two years ago. I was most disappointed in the results.
Before that… probably fifteen years.
I was consistently the same weight for so long, it seemed unnecessary. Getting older seems to have changed everything, which I also find disappointing and somewhat depressing, so I now avoid doing it.
I own a mirror. If I didn’t have a mirror, twice a day. 
I used to weigh myself once a day, but now that I’m sharing the bedroom with a baby who’s very sensitive to any sound, even if it’s coming from the master bath, I do it maybe once a week.
Never, I guess. I don’t have a set of scales, and I’m not really curious.
How can you weigh yourself multiple times every day? That’s like checking the temperature outside every five minutes or something. You’ve got a problem.
You need to control the scream of horror. 
When I go to the doctor’s office- once or twice a year.
Every three months. The Red Cross weighs me when I go to give blood.
Never. If my pants are tight, I’ve gained weight; if they’re loose, I’ve lost some. Anything more precise than that is just being anal.
Once every two weeks; sometimes once per month.
I used to weigh myself daily while losing weight and it made me miserable, so I declared a temporary moratorium on weighing for several months. Now I do it just often enough to record whether or not I’m making progress.
Never. When I’m trying to lose weight I just go by how my clothes fit. I owned a scale once, but it became an obsession for me too. At least three times a day, sometimes more.