Free Weight Loss Calculator: Find Your Daily Calorie Goal

 

⚖️ Smart Weight Loss Calculator with API Integrations

Calculate your personalized plan, scan food barcodes, find healthy recipes, and get WHO health guidelines

👤 Personal Profile

Gender i Male Female

Age i

Height i

165 cm

Current Weight i

75 kg

Activity Level i Sedentary (little or no exercise) Lightly Active (light exercise 1-3 days/week) Moderately Active (moderate exercise 3-5 days/week) Very Active (hard exercise 6-7 days/week) Extremely Active (very hard exercise & physical job)

Choose based on your daily activity including work and exercise

🎯 Weight Loss Goals

Target Weight i

65 kg

Weekly Weight Loss Goal i

0.75 kg/week

Recommended: 0.5-1 kg (1-2 lbs) per week for sustainable loss

📊 WHO Healthy BMI Guide

Underweight
< 18.5

Normal
18.5 - 24.9

Overweight
25 - 29.9

Obese
≥ 30

Based on World Health Organization guidelines

⚠️ Important Safety Note

Weight loss faster than 1 kg (2 lbs) per week may lead to muscle loss, nutritional deficiencies, and metabolic slowdown. For personalized advice, consult with a healthcare professional.

🥗 Diet Preferences

Diet Type i Balanced (50% Carbs, 30% Protein, 20% Fat) Low Carb (25% Carbs, 35% Protein, 40% Fat) High Protein (40% Carbs, 40% Protein, 20% Fat) Keto (10% Carbs, 25% Protein, 65% Fat) Mediterranean (45% Carbs, 20% Protein, 35% Fat)

Meals Per Day i 3 Meals 4 Meals (3 meals + 1 snack) 5 Meals (3 meals + 2 snacks) 6 Small Meals

Dietary Preferences i No Restrictions Vegetarian Vegan Gluten-Free Dairy-Free

💪 Exercise Plan

Weekly Exercise Days i 0 days (sedentary) 1 day 2 days 3 days 4 days 5 days 6 days 7 days

Exercise Intensity i Light (walking, yoga, stretching) Moderate (jogging, cycling, weight training) Intense (running, HIIT, sports) Very Intense (competitive training, marathon prep)

💡 Exercise Tips

• Combine cardio and strength training for best results
• Allow 1-2 rest days per week for recovery
• Gradually increase intensity to prevent injury
• Include NEAT (Non-Exercise Activity Thermogenesis) like walking
• Listen to your body - rest when needed

📱 Food Scanner & Comparison

Open Food Facts API Online

Scan or Enter Barcode

Product Information

🥗 Healthier Choice Comparison

Compare two products to see which is healthier:

Product 1

Product 2

Comparison Result

🍽️ Healthy Recipes

Edamam Recipe API Online

Search Recipes

Health Labels Vegan Vegetarian Low-Carb High-Protein Gluten-Free Dairy-Free Keto-Friendly Paleo Sugar-Conscious

Hold Ctrl/Cmd to select multiple

Max Calories per Serving

Cuisine Type Any Cuisine American Asian British Caribbean Central Europe Chinese Eastern Europe French Indian Italian Japanese Kosher Mediterranean Mexican Middle Eastern Nordic South American South East Asian

📈 Your Personalized Weight Loss Plan

Daily Maintenance Calories

0

Calories/Day

Weight Loss Calories

0

Calories/Day

Weekly Deficit

0

Calories/Week

Daily Protein Target

0

Grams/Day

🍽️ Daily Macronutrient Targets

Carbs: 0g (0%) Protein: 0g (0%) Fat: 0g (0%)

Calories per Meal

0

Protein per Meal

0g

Water Target

0L

📅 Weight Loss Timeline

To Lose 5%

0 wks

0 kg

To Lose 10%

0 wks

0 kg

To Target Weight

0 wks

0 kg

Total Loss

0 kg

0%

🌐 API Integration Status

Open Food Facts

Global food database with barcode scanning

Online

Scanned products: 0

Edamam Recipes

Diet-specific healthy recipes

Online

API calls remaining: ~10,000/month

WHO Guidelines

Healthy BMI ranges and standards

Online

Based on global health data

🎯 Your Personalized Success Tips

Buy me a coffee

Disclaimer: This calculator provides estimates for informational purposes only. Individual results may vary. Consult with a healthcare professional before starting any weight loss program.

© 2026 Smart Weight Loss Calculator with API Integrations | For educational use only

Powered by Open Food Facts, Edamam, and WHO data

📘 How to Use a Free Weight Loss Calculator to Set Realistic Goals (2026 Guide) 📘 Struggling to Lose Weight? TDEE Explained (And Why You Need to Know It) 📘 Beyond the Scale: 5 Things Your Weight Loss Calculator Can't Tell You 📘 Why Am I Not Losing Weight? Troubleshooting Your Calculator Results 📘 Do Men Lose Weight Faster Than Women? How Gender Affects Your Calorie Calculator

SCIENCE-BASED WEIGHT LOSS

Smart Weight Loss Guide:
TDEE, BMR, Macronutrients & Healthy Progress

Understand the science behind sustainable weight loss — from calorie math to food scanning, all backed by WHO guidelines and clinical formulas.

How to Use the Smart Weight Loss Calculator

1.

Complete your Profile – Enter gender, age, height, weight, and activity level. This determines your Basal Metabolic Rate (BMR) and TDEE.

2.

Set Your Goals – Choose target weight and weekly loss rate (0.5–1 kg recommended). The calculator ensures safe deficits.

3.

Select Diet & Exercise – Pick a diet type (balanced, low-carb, keto, etc.) and your exercise frequency. Macronutrients adjust automatically.

4.

Scan & Compare Foods – Use the barcode scanner (Open Food Facts) to see nutrition facts. Compare two products to choose healthier options.

5.

Find Healthy Recipes – Search Edamam’s recipe database with filters for diet, calories, and health labels (vegan, gluten-free, etc.).

6.

Get Your Plan – Click “Calculate” to see daily calories, macros, meal breakdown, weight loss timeline, and personalized tips.

Pro tip: Use the barcode scanner on packaged foods to log calories effortlessly. The recipe search can suggest meals that match your diet type and calorie target.

Why Science-Based Weight Loss Matters

Crash diets and extreme calorie restriction fail 95% of the time—they trigger metabolic slowdown, muscle loss, and rebound weight gain. The Smart Weight Loss Calculator uses clinically validated formulas (Mifflin-St Jeor for BMR) and WHO health guidelines to create a deficit that’s safe, sustainable, and personalized.

“A deficit of 500–1000 calories per day leads to 0.5–1 kg (1–2 lbs) of fat loss per week—the rate associated with long-term success and minimal muscle loss.”

— Based on CDC & WHO weight management guidelines

The calculator also ensures adequate protein intake (≥1.6g per kg body weight) to preserve lean mass, integrates exercise adjustments, and provides meal-by-meal breakdowns so you know exactly how to distribute calories throughout the day. Combined with the barcode scanner and recipe API, you have a complete ecosystem for making informed food choices.

The Math Behind Every Calculation

Basal Metabolic Rate (BMR) – Mifflin-St Jeor

Men: BMR = (10 × weight kg) + (6.25 × height cm) – (5 × age) + 5

Women: BMR = (10 × weight kg) + (6.25 × height cm) – (5 × age) – 161

Example: 35-year-old woman, 75 kg, 165 cm → BMR = (10×75) + (6.25×165) – (5×35) – 161 = 1,473 kcal/day (calories burned at rest).

Total Daily Energy Expenditure (TDEE)

TDEE = BMR × Activity Factor × Exercise Adjustment

Example: BMR 1,473 × 1.55 (moderately active) × 1.15 (3 exercise days) = ~2,625 kcal/day (total daily burn).

Caloric Deficit & Fat Loss

Weekly Deficit = Target Loss (kg/week) × 7700 kcal

Weight-Loss Calories = TDEE – (Weekly Deficit ÷ 7)

Example: 0.75 kg/week goal → deficit = 0.75 × 7700 = 5,775 kcal/week → daily deficit 825 kcal → target intake = 2,625 – 825 = 1,800 kcal/day.

Macronutrient Targets

Protein (g) = (Calories × Protein%) ÷ 4

Carbs (g) = (Calories × Carbs%) ÷ 4

Fat (g) = (Calories × Fat%) ÷ 9

Balanced diet (50% carbs, 30% protein, 20% fat): 1,800 kcal → Protein = (1,800×0.3)/4 = 135g, Carbs = 225g, Fat = 40g. Minimum protein is also adjusted to ≥1.6g/kg body weight.

Timeline to Goal

Weeks to Goal = Total Weight to Lose (kg) ÷ Weekly Loss Rate (kg/week)

Example: 10 kg to lose, 0.75 kg/week → ~13.3 weeks to reach target weight.

Frequently Asked Questions

What’s the difference between BMR and TDEE?

BMR is calories burned if you were in a coma—just to keep you alive. TDEE includes all daily activities, exercise, and digestion. Always eat based on TDEE minus a safe deficit.

How much protein do I really need during weight loss?

Research suggests 1.6–2.2g per kg of body weight to preserve muscle. The calculator automatically ensures your protein meets this minimum, adjusting your macros accordingly.

How accurate is the barcode scanner?

The scanner uses Open Food Facts, a global open database with over 3 million products. If a product isn’t found, you can still manually enter nutrition info. It’s an excellent tool for tracking packaged foods.

Are the recipe results diet-specific?

Yes! The Edamam API filters by your selected diet type (low-carb, high-protein, keto, etc.) and health labels (vegan, gluten-free). Results also show calories, protein, and carbs per serving.

Is losing 1 kg per week safe?

For most people, 0.5–1 kg (1–2 lbs) per week is considered safe by the CDC and WHO. Faster loss often leads to muscle loss and nutritional deficiencies. The calculator will warn you if your target rate exceeds recommended limits.

Why does the calculator adjust my calories if I exercise more?

Exercise increases TDEE. If you burn more, you need more energy to maintain the same deficit. The calculator adds an exercise multiplier to ensure you’re not under-eating and losing muscle instead of fat.

Science-Backed Success Strategies

• 📊 Track consistently – Use the barcode scanner to log foods. Awareness alone improves adherence by 30%.
• 🥩 Prioritize protein – Aim for 20–30g per meal to preserve muscle and increase satiety.
• 💧 Hydrate wisely – Drink 35ml per kg body weight. Water before meals can reduce calorie intake.
• 🏋️ Combine cardio + strength – Resistance training prevents metabolic slowdown during deficit.
• 🍽️ Use the meal breakdown – Distribute calories and protein across 4–5 meals to control hunger and energy.
• 📱 Explore new recipes – The recipe search helps you discover meals that fit your macros and taste preferences.

Mifflin-St Jeor

Gold standard BMR

Every body is unique. Use this calculator as your starting point, adjust based on real-world results, and always consult a healthcare professional before beginning any weight loss program.

Back to Calculator

Smart Weight Loss Calculator © 2026 · Mifflin-St Jeor formula · WHO BMI guidelines · Open Food Facts & Edamam API integrations. Compatible with Blogger, Edge, Chrome, Safari — full contrast accessibility.

No white-on-white text — guaranteed readability. Data-driven weight loss starts here.