Slim Calculator – Reach Your Ideal Weight Faster
The Slim Calculator helps you create a healthy and realistic weight loss plan by calculating how much weight you can lose, how long it will take, and how many calories you should consume Whether you're slimming down for health, appearance, or a specific event — this tool gives you a clear path forward.
How to Use the Slim Calculator
To use the tool, simply enter:
- Your current weight and target weight
- Height, age, gender
- Your activity level (sedentary to very active)
- Desired pace of weight loss (e.g., 0.5 kg/week or 1 lb/week)
The calculator shows your daily calorie goals and estimated timeline.
How It Works
- BMR (Basal Metabolic Rate) is calculated using the Mifflin-St Jeor Equation
- TDEE (Total Daily Energy Expenditure) = BMR × Activity Level
- Calorie deficit is applied based on your chosen weight loss pace
1 pound (0.45 kg) of fat = approx. 3500 calories. So, a 500-calorie daily deficit = 1 lb/week fat loss.
Example
Current weight: 80 kg
Goal weight: 70 kg
Weekly goal: 0.5 kg loss
Estimated time = 20 weeks
Daily calories = 1800 kcal/day (after 500 kcal deficit from TDEE)
Common Use Cases
- Planning a gradual and safe weight loss
- Cutting for a fitness competition
- Creating calorie targets for slimming apps
- Tracking progress against realistic timelines
- Supporting a medical weight loss program
Why Use a Slim Calculator?
Crash diets and unrealistic goals can be unhealthy. This calculator uses science-backed equations to help you set sustainable, personalized goals based on your body and lifestyle.
Frequently Asked Questions (FAQs)
Is it safe to lose 1 kg per week?
Up to 1 kg/week is considered safe for most people. Always consult a doctor if unsure.
Can I use this for weight gain?
This calculator is primarily for weight loss. Use our gain calculator for mass-building goals.
What activity level should I choose?
Choose based on your actual weekly movement: sedentary (little/no exercise), moderate (3–5x/week), very active (daily training).
Does this account for muscle vs fat loss?
No. It focuses on calorie-based fat loss. For body composition tracking, use body fat percentage tools.
Is BMR the same as TDEE?
No. BMR is resting energy use. TDEE includes all daily activity.
Related tools: BMR Calculator, Calorie Calculator, BMI Calculator.