On days when I don't feel up to the gym or can't get there, I run up and down a flight of 14 steps about 40-50 times. I work up a pretty good sweat and my heart rate gets up there, but do you think it's an adequate exercise for the day if that's all I do? How many calories do you think it may burn?

OMG that sounds like a great workout... 40-50x? I guess that good!! Keep it up...

How long does it take you?

The 'average' 150 lb woman burns approx 100 cal per 15 min of moderate exercise.
That's a generalization of course

You're running up at least 600 stairs! I'd say that's an AWESOME workout!

When it gets too easy, look into wearing a weighted vest.

I think you must burn around 200-300 calories with what you're doing.

I personally have no idea, but damn that's an awesome workout. Need to find me some stairs now...