The most commonly thrown around figure I've seen on forums such as this is 50 cals per pound. Which is pretty ridiculous.
I'll use myself as an example. And it doesn't matter if you're a woman or a man. Muscle is muscle with the same physiological and metabolic properties.
When I started this journey, I was 170ish pounds. I am now approximately 205. That's 35 lbs gain. If you saw my pics, I'm lean.
But I'll give it the benefit of the doubt and say 10 lbs of that was fat. That's 25 lbs of muscle I've put on.
With these illogical numbers, I should be burning 1250 more calories per day.
Hint: I'm not. Not even close.
I've worked with a bunch of people and anyone who realizes appreciable hypertrophy doesn't automatically get to eat thousands of calories more per day with out facing the consequences of fat gain.
Now let's throw another major loop into the equation here. This is a forum dedicated to weight loss. As noted above, in order to to lose weight, a calorie deficit MUST be in place. And when a deficit is in place, it's pretty much going to be impossible to pack on slabs of muscle. At least enough to make an iota of difference... even assuming 50 calories per pound.
Dieters don't have the energetic capacity to maintain what they have currently. So there's no friggen way they're going to be gaining a bunch of tissue.
And just for your knowledge, I dug up the paper I was referencing... research puts the number at 5.89kcal/lb/day
**source being --
Curr Opin Clin Nutr Metab Care. 2001 Mar;4(2):143-7. Links
Dissecting the energy needs of the body.McClave SA, Snider HL.
Department of Medicine, University of Louisville School of Medicine, 550 South Jackson Street, Louisville, Kentucky 40292, USA.
samcclave@louisville.edu