The Ultimate Calorie to Pounds Weight Loss Calculator (Scientifically Adjusted)

Estimate a personalized daily calorie target, weight-loss pace, and practical protein, fat, and carbohydrate ranges using your body measurements and goal.

🔥 The Ultimate Calorie to Pounds Weight Loss Calculator (Scientifically Adjusted)

Estimate a personalized daily calorie target, weight-loss pace, and practical protein, fat, and carbohydrate ranges using your body measurements and goal.

Your essentials

Start with five inputs. Nothing entered here leaves your browser.

Age

Adults aged 18 to 100

Please enter an age from 18 to 100.

Gender / sex used by the formula

Mifflin-St Jeor uses a sex-specific constant

Height in centimetres

For example, 165 cm

Please enter a height from 120 to 230 cm.

Weight in kilograms

For example, 75 kg

Please enter a weight from 35 to 300 kg.

Weekly weight-loss goal

A slower target is generally easier to sustain

Interactive Visualization

Estimated Output

Scale max

— Waiting for input

Enter your values to calculate an estimate.

Uses your browser's print-to-PDF feature. Your entries stay on this device.

Method: Mifflin-St Jeor BMR × activity factor − goal deficit
Macros are planning estimates based on calorie target, body weight, optional body-fat percentage, and preference.

*Conversion calculations are based on thermodynamic body weight modeling. Adjust targets based on actual physical feedback.

❓ Frequently Asked Questions

How many calories do I need to burn to lose 1 pound?

You need a deficit of approximately 3,500 calories to lose 1 pound of body fat. This can come from eating less, exercising more, or a combination of both. A daily deficit of 500 calories leads to about 1 pound lost per week.

Is the 3,500 calories per pound rule accurate?

It's a useful estimate, but individual results vary based on metabolism, body composition, and hormone levels. Some people lose faster, others slower. Use this calculator as a guideline, not a guarantee.

Can I lose 2 pounds per week safely?

A 1,000 calorie daily deficit (7,000 per week) typically results in 2 pounds lost per week. Most health experts consider this the maximum safe rate. Faster loss may lead to muscle loss and nutrient deficiencies.

What is a healthy daily calorie deficit?

For most adults, a 300-500 calorie daily deficit is sustainable and healthy. This leads to 0.5-1 pound lost per week. Very low calorie diets (under 1,200 calories for women, 1,500 for men) should only be done under medical supervision.

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Weekly Calculator Monthly Calculator Daily Calculator Exercise Calculator Walking Calculator Running Calculator

La ciencia detrás de las calorías y la grasa corporal

La regla de Wishnofsky y la primera ley de la termodinámica

El cambio de peso se rige por el equilibrio energético biológico. Según la regla de Wishnofsky, aproximadamente 3500 calorías de déficit o excedente de energía equivalen a una libra de tejido adiposo (grasa corporal) almacenada. Esta es una aplicación de la Primera Ley de la Termodinámica: la energía no se puede crear ni destruir, sólo almacenarse en forma de grasa o quemarse para el trabajo metabólico.

Interactive Calorie Energy and Body-Mass Equivalent

Adjust the slider to compare calorie energy with the historical static body-fat equivalent; kilograms and kilocalories remain separate conservation units.

⚡ Energy

⚖️ Mass

3,500 kcal

Energy In

1.00 lbs

Fat Stored

Select Energy Input (kcal)

0 kcal 7,000 kcal 14,000 kcal

Adipose

Static Energy-Equivalent Model

In the historical static model, 3,500 kcal represents an estimated one-pound energy equivalent, not an exact biological outcome.

📉 Comprender los déficits de calorías frente a los excedentes

Para perder peso, debe crear un déficit de calorías (equilibrio energético negativo) donde su ingesta esté por debajo de su gasto energético diario total (GDEE). Por el contrario, el desarrollo muscular o el aumento de peso requieren un excedente de calorías (equilibrio energético positivo). Nuestro conversor le ayuda a asignar estos objetivos de energía directamente a libras de masa corporal.

Core Biological Entities Defined

✔ Adipose Tissue: The anatomical term for body fat, which stores chemical energy.
✔ TDEE: Total Daily Energy Expenditure represents the total calories burned in 24 hours.
✔ Wishnofsky's Rule: The historical approximation that treats 3,500 kcal as a one-pound energy equivalent, not a guaranteed tissue change.

Interactive Calorie Balance Visualizer

Adjust your TDEE and daily intake to visualize calorie balance states and the physiological processes involved.

Your TDEE (Maintenance) 2,000 kcal

1,500 kcal 4,000 kcal

Daily Calorie Intake 1,500 kcal

500 kcal 5,000 kcal

Current State

Calorie Deficit

Lipolysis (Fat Loss)

Your calorie intake is below your TDEE. Your body metabolizes stored triglyceride lipids from adipose tissue to satisfy its energy needs.

Net Energy Change

-500 kcal/day

Weekly Mass Change

-1.00 lbs

Interactive Weight Loss Timeline

Select a target weight and daily calorie deficit to map your progress milestones along a biological timeline.

Target Weight:

Planned Daily Calorie Deficit 500 kcal / day

200 kcal 1,500 kcal (Advanced)

Total Deficit Required

35,000 kcal

Days to Achieve

70 Days

Expected Target Date

September 5, 2026

Start Day 0

Halfway Day 35

Goal Day 70