Weight Loss Calculator By Age

Weight Loss Formula:

\[ \text{Daily Calorie Intake} = \text{TDEE} - \text{Deficit} \] \[ \text{TDEE} = \text{BMR} \times \text{Activity Factor} \]

Age:

years

Gender:

Weight:

Height:

Activity Level:

Calorie Deficit:

kcal/day

BMR:

TDEE:

Daily Calorie Intake:

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1. What is TDEE and Calorie Deficit?

TDEE (Total Daily Energy Expenditure) represents the total number of calories you burn each day. A calorie deficit occurs when you consume fewer calories than your TDEE, leading to weight loss.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation to calculate BMR (Basal Metabolic Rate), then adjusts for activity level to determine TDEE:

\[ \text{For Men: BMR} = 10 \times \text{weight} + 6.25 \times \text{height} - 5 \times \text{age} + 5 \] \[ \text{For Women: BMR} = 10 \times \text{weight} + 6.25 \times \text{height} - 5 \times \text{age} - 161 \] \[ \text{TDEE} = \text{BMR} \times \text{Activity Factor} \] \[ \text{Daily Calorie Intake} = \text{TDEE} - \text{Deficit} \]

Where:

\( weight \) — Body weight in kilograms
\( height \) — Height in centimeters
\( age \) — Age in years
Activity Factor — Multiplier based on activity level (1.2-1.9)
Deficit — Typically 500 kcal/day for safe weight loss

3. Importance of Age in Weight Loss

Details: Metabolism slows with age due to loss of muscle mass and hormonal changes. The calculator accounts for this through the age component in the BMR calculation.

4. Using the Calculator

Tips: Enter your age, gender, current weight in kg, height in cm, select your activity level, and desired calorie deficit (typically 500 kcal/day for safe weight loss).

5. Frequently Asked Questions (FAQ)

Q1: Why does age affect weight loss?
A: Metabolism slows by about 1-2% per decade after age 20 due to muscle loss and hormonal changes, reducing your TDEE.

Q2: What's a safe calorie deficit?
A: 500 kcal/day deficit is generally safe, leading to about 0.5kg weight loss per week. Larger deficits may cause muscle loss.

Q3: How accurate is this calculator?
A: It provides estimates. Individual variations in metabolism, body composition, and other factors affect actual calorie needs.

Q4: Should I adjust my deficit as I lose weight?
A: Yes, recalculate periodically as weight loss reduces your TDEE. Every 5-10 kg lost, recalculate your needs.

Q5: What if I'm not losing weight at the suggested calories?
A: You may need to adjust your activity factor or deficit slightly. Consult a dietitian for personalized advice.