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Cómo Calcular El Déficit Calórico Para Perder Peso

Reviewed by Calculator Editorial Team

Losing weight through a caloric deficit is one of the most effective ways to achieve your health goals. This guide explains how to calculate your deficit, understand the science behind it, and maintain sustainable results.

What is a caloric deficit?

A caloric deficit occurs when you consume fewer calories than your body needs to maintain its current weight. This creates an energy imbalance that forces your body to use stored fat for fuel, leading to weight loss.

The key principle is simple: to lose weight, you need to burn more calories than you consume. The amount of weight lost depends on the size of the deficit and how long you maintain it.

Important: A caloric deficit is not the same as a low-calorie diet. It's about creating a sustainable energy balance that supports your health and fitness goals.

How to calculate your caloric deficit

Calculating your caloric deficit involves three main steps:

  1. Determine your Total Daily Energy Expenditure (TDEE)
  2. Calculate your target calorie intake
  3. Find the difference between your TDEE and target intake

Formula

Caloric Deficit = TDEE - Target Calorie Intake

Where:

  • TDEE = Total Daily Energy Expenditure
  • Target Calorie Intake = Your desired daily calorie consumption

Step 1: Calculate your TDEE

The TDEE accounts for all the calories your body burns in a day, including:

  • Basal Metabolic Rate (BMR) - calories burned at rest
  • Activity level - calories burned through daily activities

TDEE Formula

TDEE = BMR × Activity Factor

Activity factors typically range from 1.2 (sedentary) to 1.9 (very active).

Step 2: Determine your target calorie intake

Your target intake depends on your weight loss goals:

  • Mild weight loss (0.25-0.5 kg/week): 20-30% below TDEE
  • Moderate weight loss (0.5-1 kg/week): 30-50% below TDEE
  • Agressive weight loss (1+ kg/week): 50% or more below TDEE

Warning: Aggressive deficits may lead to muscle loss and nutrient deficiencies. Always consult a healthcare professional before starting a new diet plan.

Step 3: Calculate the deficit

Subtract your target calorie intake from your TDEE to find your daily deficit. For example:

  • If your TDEE is 2,500 kcal and your target is 1,800 kcal
  • Your deficit is 700 kcal per day

Example calculation

Let's walk through a complete example:

1. Calculate BMR

For a 30-year-old woman, 165 cm tall, weighing 65 kg:

BMR = 655 + (9.6 × 65) + (1.8 × 165) - (4.7 × 30)

= 655 + 624 + 297 - 141

= 1,435 kcal/day

2. Calculate TDEE

Assuming moderate activity (1.55 activity factor):

TDEE = 1,435 × 1.55

= 2,230 kcal/day

3. Set target intake

For mild weight loss (25% deficit):

Target = 2,230 × 0.75

= 1,672.5 kcal/day

4. Calculate deficit

Deficit = 2,230 - 1,672.5

= 557.5 kcal/day

This woman would need to consume about 1,673 calories per day to lose weight at a mild pace while maintaining her activity level.

Tips for successful weight loss

1. Track your food

Use a food diary or app to monitor your calorie intake accurately. This helps you stay aware of your deficit and make adjustments as needed.

2. Stay hydrated

Drink plenty of water throughout the day. Sometimes thirst is mistaken for hunger, which can lead to overeating.

3. Exercise regularly

Combining diet with physical activity increases your TDEE and helps you burn more calories. Aim for at least 150 minutes of moderate exercise per week.

4. Get enough sleep

Poor sleep can disrupt hunger hormones and increase cravings. Aim for 7-9 hours of quality sleep per night.

5. Be patient

Weight loss is a gradual process. Maintain your deficit consistently for at least 8-12 weeks to see noticeable results.

Note: Results may vary based on individual metabolism, activity level, and other factors. Always consult a healthcare professional before making significant dietary changes.

FAQ

How much weight can I lose in a week?
Most healthy adults can lose 0.5-1 kg (1-2 lbs) per week through a caloric deficit. Faster weight loss may lead to muscle loss and nutrient deficiencies.
Is a caloric deficit the only way to lose weight?
While a caloric deficit is the most direct method, other factors like exercise, sleep, and stress management also play important roles in weight loss.
Can I lose weight without counting calories?
Yes, you can use portion control, mindful eating, and intuitive eating techniques to create a deficit without strict calorie counting.
How long does it take to see results?
Visible changes typically occur within 4-8 weeks of maintaining a consistent deficit. Fat loss becomes more noticeable after 3-6 months.