Weight Loss Calculator

Clinical Energy Balance & Mifflin-St Jeor Formulation

Sustainable fat loss requires creating a steady negative energy balance while consuming adequate dietary protein to prevent muscle loss:

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• Basal Metabolic Rate (BMR) — Mifflin-St Jeor Equation**:

$$\text{Men: } BMR = (10 \times W_{\text{kg}}) + (6.25 \times H_{\text{cm}}) - (5 \times \text{Age}) + 5$$

$$\text{Women: } BMR = (10 \times W_{\text{kg}}) + (6.25 \times H_{\text{cm}}) - (5 \times \text{Age}) - 161$$

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• Total Daily Energy Expenditure (TDEE)**:

$$\text{TDEE} = \text{BMR} \times \text{Physical Activity Multiplier}$$

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• Calorie Deficit vs Weekly Fat Loss**:

• $0.5\text{ lb/week}$ loss: $-250\text{ kcal/day}$ deficit (Gentle & highly sustainable)

• $1.0\text{ lb/week}$ loss: $-500\text{ kcal/day}$ deficit (Clinical gold-standard recommendation)

• $1.5\text{ lbs/week}$ loss: $-750\text{ kcal/day}$ deficit (Aggressive cut)

• $2.0\text{ lbs/week}$ loss: $-1,000\text{ kcal/day}$ deficit (Maximum safe rate)

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• Caloric Safety Floors**: Never consume below $1,500\text{ kcal/day}$ for men or $1,200\text{ kcal/day}$ for women without direct physician supervision to prevent micronutrient deficiencies, hair loss, and thyroid down-regulation.

How to Use This Calculator

Enter Unit System, Biological Sex, Age (Years), Current Body Weight into the input fields and the calculator will instantly compute Daily Calorie Target for Weight Loss, Current Maintenance TDEE. All calculations happen in real time — no submission or page reload required. You can adjust any input value and see the result update immediately.

Understanding Your Result

The Weight Loss result gives you a precise, calculated value based on the inputs you provide. Compare your result against published benchmarks from WHO, CDC, and NIH to assess where you stand. A single calculation is a useful starting point, but tracking this metric over time — as inputs change — gives you a much more complete picture.

Practical Application

The Weight Loss is most useful when you have specific, real-world data to enter. For example: enter your actual Unit System to calculate your daily calorie target for weight loss. The result helps health-conscious individuals, patients, and caregivers make informed decisions about tracking health metrics and understanding clinical reference ranges. This calculator is trusted by professionals and individuals alike because it follows the exact formulas validated by WHO, CDC, and NIH.

Accuracy Notes and Limitations

These results are screening estimates. Always consult a licensed healthcare provider before making changes to diet, medication, or exercise. The accuracy of any calculator is limited by the quality of the inputs provided. Double-check your units before entering values — unit errors are the most common source of incorrect results. For critical decisions, cross-reference with at least one additional source or professional consultation.

Frequently Used With

This calculator is often used alongside other health tools to build a complete analytical picture. Combining multiple related calculations provides stronger evidence for decisions than relying on any single metric. Browse the Health category to find complementary calculators for your specific use case.