Weight Loss Calculator

Author: Henrick Yau
- May 14, 2025
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Calculators

Calculate your weight loss targets, timeline, and daily calorie needs based on your personal information and goals. This calculator helps you plan a healthy and sustainable weight loss journey.

Personal Information

years

Weight Loss Goals

kg
%

Advanced Options

kcal
kcal

About Weight Loss

Healthy weight loss involves creating a calorie deficit through diet and exercise. The recommended rate is 0.5-1 kg (1-2 pounds) per week, which is sustainable and helps preserve muscle mass while primarily losing fat.

Calorie Deficit

To lose weight, you need to consume fewer calories than you expend. A deficit of 500 calories per day results in approximately 0.5 kg (1 pound) of weight loss per week, as 1 kg of body fat contains about 7,700 calories.

Basal Metabolic Rate (BMR)

BMR is the number of calories your body needs to maintain basic functions at rest. This calculator uses the Mifflin-St Jeor equation, which is considered one of the most accurate formulas for estimating BMR:

  • For men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
  • For women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
Total Daily Energy Expenditure (TDEE)

TDEE takes your BMR and multiplies it by an activity factor to account for calories burned during daily activities and exercise:

  • Sedentary: BMR × 1.2 (little or no exercise)
  • Lightly active: BMR × 1.375 (light exercise 1-3 days/week)
  • Moderately active: BMR × 1.55 (moderate exercise 3-5 days/week)
  • Active: BMR × 1.725 (hard exercise 6-7 days/week)
  • Very active: BMR × 1.9 (very hard exercise & physical job)
Healthy Weight Loss Tips
  • Focus on nutrient-dense foods rather than just reducing calories
  • Include strength training to preserve muscle mass
  • Stay hydrated (aim for 8-10 glasses of water daily)
  • Get adequate sleep (7-9 hours per night)
  • Be consistent with your eating and exercise habits
  • Track your progress but don't obsess over daily weight fluctuations

Health Disclaimer: This calculator provides estimates based on general formulas and should not replace professional medical advice. Consult with a healthcare provider before starting any weight loss program, especially if you have existing health conditions.

Setting Realistic Weight Loss Goals

The Weight Loss Calculator is an easy-to-use online tool that helps you set a clear and achievable plan for reaching your ideal body weight. Whether you want to reach a specific target weight, reduce your body fat percentage, or achieve a healthier BMI (Body Mass Index), this calculator provides personalized daily calorie goals, estimated weight loss timelines, and nutritional recommendations to guide your progress.

Daily Calorie, Timeline, and BMI Features

BMR, BMI, and Calorie Deficit Formulas

BMR (Mifflin-St Jeor Formula):
For men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5
For women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161
BMI (Body Mass Index):
BMI = weight (kg) / (height in meters)²
Calorie Deficit Required:
1 kg of fat ≈ 7,700 calories
Daily Calorie Deficit = (Weekly Goal × 7,700) / 7
Target Daily Calorie Intake:
Daily Calories = TDEE − Daily Deficit + Adjustments

Entering Data and Choosing Your Goal

  1. Enter your personal information: weight, height, age, gender, and activity level.
  2. Select your goal: You can choose a target weight, specify how much weight you want to lose, set a target BMI, or input a desired body fat percentage.
  3. Choose your weekly weight loss rate: Options range from gentle to aggressive rates, depending on your preferences and needs.
  4. Adjust advanced options (optional): Fine-tune your plan with calorie adjustments or exercise calorie estimates.
  5. Click “Calculate Weight Loss Plan” to see your personalized results, including calorie needs, timeline, macro breakdown, and more.

Personalized Plans for Healthy Weight Loss

  • Helps you set realistic and healthy weight loss goals
  • Acts as a combined calorie calculator, BMI tool, and body fat calculator
  • Provides a clear calorie intake guide to support your progress
  • Shows how your weight, BMI, and energy needs will evolve each week
  • Offers macro and hydration recommendations to support overall health

Questions About Weight Loss Planning

Is this calculator suitable for both men and women?

Yes, it calculates differently based on gender using standard BMR and body composition formulas.

What is a healthy rate of weight loss?

Most experts recommend losing 0.5 to 1 kg per week. This calculator supports that range.

Can I use it to check my BMI?

Absolutely. It automatically calculates and displays your current and target Body Mass Index (BMI).

How does it calculate daily calorie needs?

It uses your basal metabolic rate (BMR) and multiplies it by your activity level to get your TDEE, then subtracts a calorie deficit to support fat loss.

Do I need to enter my body fat percentage?

No, it's optional. But if your goal is based on fat percentage, entering it helps improve accuracy.

Is this a calorie calculator or a BMR calculator?

It's both. It includes a calorie needs calculator, calorie deficit guide, BMR estimate, and even acts as a body composition tool.

Planning Your Weight Loss Journey

The Weight Loss Calculator is a practical way to plan and track your progress. By combining features from popular tools like the Calorie Calculator, BMI Calculator, BMR Calculator, and Body Fat Calculator, it provides a complete view of your weight loss journey. Whether you're setting out to hit a new target weight or need a clear calorie intake guide, this tool offers the insights you need to stay focused and informed.

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