TDEE WHAT IS IT? HOW DO U FIGURE IT?

On january 1 i weigh 270 i have been stationary biking 9 miles a day and i workout with weights 4 days a week. As of this morning i weigh 254. I eat 1000 to 1200 calories a day. Does this seem right and how would i figure what i should be doing as far as the TDEE goes thanks for ur help

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