1. What is This Calorie Calculator?

This calculator estimates the daily calorie intake needed for weight loss in UK women, based on the Mifflin-St Jeor equation with a 500 kcal deficit for steady weight loss.

2. How Does the Calculator Work?

The calculator uses the equation:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in centimeters
• \( age \) — Age in years
• \( activity\_factor \) — Multiplier for physical activity level
• \( -500 \) — Calorie deficit for weight loss

Explanation: The equation calculates basal metabolic rate (BMR), adjusts for activity level, then subtracts 500 kcal to create a weight-loss deficit.

3. Importance of Calorie Calculation

Details: Accurate calorie estimation helps create sustainable weight loss plans (0.5-1 kg per week) while maintaining energy levels and nutritional adequacy.

4. Using the Calculator

Tips: Enter weight in kg, height in cm, age in years, and select your activity level. For best results, use morning measurements before eating.

5. Frequently Asked Questions (FAQ)

Q1: Why subtract 500 calories?
A: A 500 kcal daily deficit typically results in about 0.5 kg (1 lb) of weight loss per week, considered a safe and sustainable rate.

Q2: What if I'm not losing weight at this calorie level?
A: Metabolic adaptation may occur. Recalculate after significant weight loss or if your activity level changes.

Q3: Is this calculator only for UK women?
A: While tailored for UK women, it can be used by others with similar body compositions and lifestyles.

Q4: Should I go below 1200 calories?
A: No, very low calorie diets (<1200 kcal) require medical supervision and may cause nutrient deficiencies.

Q5: How often should I recalculate?
A: Recalculate every 5-10 kg of weight loss or if your activity level changes significantly.