Bike exercises with Fitbit

It should be giving you a calorie adjustment for all of the things you do, walking, biking, whatever. Over the course of the day, it may make some guesses about what the remainder of the day will be like, but by the close of the day, everything should be included.

Here's a thing to know: The way this is supposed to work, in essence, is that MFP and Fitbit compare their separate estimates of how many calories you're expected to burn (MFP) and how many calories the Fitbit saw you as burning. (Both of those really are estimates, BTW, not measurements.)

Even at a sedentary/not very active setting in your MFP profile, MFP expects you to burn your estimated BMR/RMR (basal metabolic rate/resting metabolic rate), the calories it takes just being alive with a cogitating brain and a beating heart and stuff. On top of that, MFP expects you to burn some calories doing daily life humdrum stuff, like making breakfast; doing home chores; grocery shopping now and then, typing on your computer or talking on your phone at work - whatever. Even sedentary people do some of that, right? It burns calories. So, MFP has an expectation of the number of calories you'd burn all day based on what you've told it about you, using statistical formulas from research.

The Fitbit side assumes some of that, too - the BMR/RMR. Then it uses things like arm movements, heart rate, etc. to estimate the calories from your daily life humdrum and your intentional exercise.

By the end of the day, if Fitbit thinks you've burned more calories than MFP expected, you get calories added to the MFP goal to account for that difference. If Fitbit sees you as burning fewer calories than MFP expected and you have negative adjustments turned on in MFP, you'd get calories subtracted from your calorie goal. (I'd recommend turning that setting on, BTW.)

Assuming all those estimates are reasonably accurate (possibly a meaningful assumption), your updated calorie goal will preserve the calorie deficit you asked for in your MFP profile, i.e., 500 calories a day deficit for a pound a week, 1100 calories a day deficit for a kilogram a week, or arithmetic variations along those lines.

Odds of your calorie adjustment matching your exercise calories are slim to nil. Some fitness trackers even display exercise calories with the BMR/RMR calories in that time slot included, and that's not what we want added to our calorie goal, since those calories are already assumed in MFP and we don't want to double count them. When they sync, as long as the two companies both got the definitions right, they account for that.

You can click on the adjustment in MFP and get a more detailed breakdown, but even that's confusing to some people.

If I had an example, I'd screen grab it for you. For most people, a good tracker worn nearly 24x7 will give a decent all day calorie estimate. I'm the rare weirdo for whom a good brand/model tracker - one that works well for others who've commented here - is wildly far off compared to 10+ years of logging/experience, so I don't sync it to MFP. Therefore, I don't have a screen to grab for that.