Total Daily Energy Expenditure Calculator

TDEE Calculator estimates daily calorie needs for weight maintenance, loss, or gain based on current weight, height, age, gender, activity level, goal weight, and time frame.

Enter values to calculate TDEE:

Current Weight (kg):

Height (cm):

Age (years):

Gender:

Activity Level:

Goal Weight (kg):

Time Frame (weeks):

Methodology Used in TDEE Calculator

The calculator estimates Total Daily Energy Expenditure (TDEE) using:

1. BMR (Mifflin-St Jeor): \\( \text{BMR} = 10 \cdot \text{Weight} + 6.25 \cdot \text{Height} – 5 \cdot \text{Age} + 5 \\) (men) or \\( -161 \\) (women)

2. TDEE: \\( \text{TDEE} = \text{BMR} \cdot \text{Activity Multiplier} \\)

3. Weight change: \\( \Delta W = |\text{Current Weight} – \text{Goal Weight}| \\)

4. Total calories: \\( C_{\text{total}} = \Delta W \cdot 7700 \\)

5. Daily adjustment: \\( C_{\text{adjust}} = \frac{C_{\text{total}}}{\text{Weeks} \cdot 7} \\) (deficit if loss, surplus if gain)

6. Adjusted TDEE: \\( \text{TDEE}_{\text{adjusted}} = \text{TDEE} \pm C_{\text{adjust}} \\) (minus for loss, plus for gain)

Where:

\\( \text{BMR} \\): Basal Metabolic Rate (kcal/day)
\\( \text{TDEE} \\): Total Daily Energy Expenditure (kcal/day)
\\( \Delta W \\): Weight change (kg)
\\( C_{\text{total}} \\): Total calories for weight change (kcal)
\\( C_{\text{adjust}} \\): Daily surplus or deficit (kcal/day)
\\( \text{TDEE}_{\text{adjusted}} \\): Adjusted daily calorie needs (kcal/day)

Assumes 7700 kcal/kg for weight change. Computes adjusted TDEE for goal.

Example Calculation (Weight Loss)

Sample Input

Current Weight = 80 kg, Height = 175 cm, Age = 30, Gender = Male, Activity Level = Moderate (1.55), Goal Weight = 75 kg, Weeks = 10

Step 1: BMR: \\( \text{BMR} = 10 \cdot 80 + 6.25 \cdot 175 – 5 \cdot 30 + 5 \approx 1750 \, \text{kcal/day} \\)

Step 2: TDEE: \\( \text{TDEE} = 1750 \cdot 1.55 \approx 2712.5 \, \text{kcal/day} \\)

Step 3: Weight loss: \\( \Delta W = 80 – 75 = 5 \, \text{kg} \\)

Step 4: Total calories: \\( C_{\text{total}} = 5 \cdot 7700 = 38500 \, \text{kcal} \\)

Step 5: Daily deficit: \\( C_{\text{deficit}} = \frac{38500}{10 \cdot 7} \approx 550 \, \text{kcal/day} \\)

Step 6: Adjusted TDEE: \\( \text{TDEE}_{\text{adjusted}} = 2712.5 – 550 \approx 2162.5 \, \text{kcal/day} \\)

Result: Adjusted TDEE = 2162.5 kcal/day for weight loss.