Do you subtract exercise calories from what you ate that day???

Its really up to the individual.

read this
http://fit101.org/the-step-by-step-guide-to-losing-weight-with-myfitnesspal/#exercise

Then decide what works best for you. I personally do eat back some of my exercise calories. Some days more than others. It is nice to have that cushion when you just want that special high calorie meal or are just a little hungrier than usual.

Put simply - it's up to you. Your calorie allowance has a deficit built in already so if you eat to zero you will still loose the weight over a period of time. If you choose not to eat your exercise calories you may well loose weight a little quicker as you are increasing the deficit but you also risk not having enough energy to fuel your workouts or repair your muscles post workout. I think a lot of it depends on what kind of exercise you do. I eat back about half my lifting exercise calories, 3/4 of my circuit training calories and 100% of my steady state exercise calories. The majority of the time I try and eat back relatively high protein, low fat food but sometimes its nice to just work out to earn a treat

I'm running 10k tomorrow and will be eating a pizza tonight to fuel it

I usually eat back whatever my Fitbit automatically adds. What activity level did you pick for your calorie goal? From what I understand, MFP gives your initial calorie limit based on the activity level you set. So, activities included in that "level" are already assumed/included, but anything outside of that should be fair game...

nina6183 wrote: »

I can't figure out if it's good to add calories to my day when I exercise? Will I still lose weight? Like if I burn 300calories and take in 300, does that mark each other out?

Yes, that's the way MFP is structured. Your default calorie goal is activity level minus deficit. (It's often referred to as net calories.) Since your deficit is already built in, you're supposed to eat back your exercise calories.

But "exercise" means exercise—not work, housework, yard work, child care, or anything else. Those are all part of your activity level.

You lose weight by eating fewer calories than you burn—period. Food is fuel, and we should all be looking for the maximum number of calories at which we lose weight—never the minimum.