Calorie Deficit Calculator
Calorie Deficit is evaluated from Age, Current Weight and Height. The calculation reports Basal Metabolic Rate, Total Daily Energy Expenditure and Required Daily Deficit.
Results
About the Calorie Deficit Calculator
The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.
Formula basis:
BMR = calories needed at rest. TDEE = BMR x activity multiplier. Daily deficit needed = weekly goal x 500 (since 1 lb = ~3,500 cal). Target daily calories = TDEE - deficit, floored at safe minimum (1,200 for women, 1,500 for men).
Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.
Formula & How It Works
The calculation applies the following relations exactly as recorded in the metadata: BMR = calories needed at rest. TDEE = BMR x activity multiplier. Daily deficit needed = weekly goal x 500 (since 1 lb = ~3,500 cal). Target daily calories = TDEE - deficit, floored at safe minimum (1,200 for women, 1,500 for men). Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.
Worked Examples
Example 1: 35-year-old woman, 165 lbs, 5'4", moderately active, lose 1 lb/week
Inputs
With Age = 35, Current Weight = 165, Height = 64 and Biological Sex = 0 as the stated inputs, the result is Basal Metabolic Rate = 1,428 cal/day, Total Daily Energy Expenditure = 2,214 cal/day and Required Daily Deficit = 500 cal/day. Each value corresponds to the declared output fields.
Example 2: 28-year-old man, 225 lbs, 6'0", lightly active, lose 1.5 lbs/week
Inputs
With Age = 28, Current Weight = 225, Height = 72 and Biological Sex = 1 as the stated inputs, the result is Basal Metabolic Rate = 2,029 cal/day, Total Daily Energy Expenditure = 2,789 cal/day and Required Daily Deficit = 750 cal/day. Each value corresponds to the declared output fields.
Example 3: 50-year-old woman, 180 lbs, 5'6", very active (CrossFit), lose 0.5 lbs/week
Inputs
With Age = 50, Current Weight = 180, Height = 66 and Biological Sex = 0 as the stated inputs, the result is Basal Metabolic Rate = 1,453 cal/day, Total Daily Energy Expenditure = 2,507 cal/day and Required Daily Deficit = 250 cal/day. Each value corresponds to the declared output fields.
Example 4: 22-year-old man, 140 lbs, 5'10", sedentary, trying to 'cut' before summer
Inputs
With Age = 22, Current Weight = 140, Height = 70 and Biological Sex = 1 as the stated inputs, the result is Basal Metabolic Rate = 1,641 cal/day, Total Daily Energy Expenditure = 1,970 cal/day and Required Daily Deficit = 500 cal/day. Each value corresponds to the declared output fields.
Common Use Cases
- Calculate daily calories for weight loss
- Determine how long to lose a target amount of weight
- Find TDEE and optimal calorie target for fat loss