Fasting is one of the most popular ways to lose weight, but figuring out how it works for you can be tricky. That’s where fasting weight loss calculators come in. These tools help you track your progress, calculate how many calories you should consume, and estimate how much weight you can lose. Whether you’re new to fasting or a seasoned pro, the right calculator can make all the difference in reaching your goals faster and easier. Let’s dive into the best fasting calculators available today!
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1. Intermittent Fasting Calculator
This Intermittent Fasting Calculator is designed to help you plan your fasting schedule based on your specific goals. Whether you’re following the popular 16:8 method or another variation like 18:6, this tool will generate your ideal eating and fasting windows. By simply entering your personal details, the calculator provides a breakdown of calories and protein per meal tailored to your fasting routine, making it easier for you to stay on track. Whether you’re aiming to lose weight, build muscle, or just feel better overall, this calculator can guide you through the process.
Intermittent fasting focuses on when you eat rather than what you eat, which is why this tool is so helpful. With the ability to track and adjust your fasting schedule, you can stay focused on your goals without worrying about overcomplicating your meal planning. It’s perfect for people who want a simple yet effective way to manage their fasting lifestyle and see real results over time.
Functions:
- Calculates your ideal fasting and eating windows based on your selected fasting schedule.
- Provides a calorie and protein breakdown per meal tailored to your goals.
- Supports various fasting schedules such as 16:8, 18:6, and others.
- Offers flexibility to adjust based on different goals like weight loss or muscle building.
Why This Calculator:
- Helps you stick to your fasting schedule by giving you clear guidelines.
- Takes the guesswork out of meal planning by showing you how much protein and calories to consume.
- Easy to use and customizable, making it suitable for beginners and seasoned fasters alike.

2. Medindia Intermittent Fasting Calculator
The Medindia Intermittent Fasting Calculator is designed to help you stay on track with your intermittent fasting goals by providing personalized meal timings and daily calorie needs. By entering details like your weight, height, age, gender, activity level, and fasting type, the tool customizes your fasting schedule to align with your unique lifestyle. Whether you’re new to intermittent fasting or have been practicing it for a while, this calculator is a great resource for optimizing your fasting experience.
The calculator supports various popular fasting methods, including 16:8, 18:6, and 20:4, and adjusts your daily calorie intake based on your selected fasting type. It’s perfect for anyone looking to make their intermittent fasting journey easier and more structured. The easy-to-follow approach helps you stay focused on your goals and adjust your routine to suit your needs.
Functions:
- Generates personalized fasting schedules based on your weight, height, age, gender, and activity level.
- Calculates daily calorie needs and adjusts them to match your fasting method.
- Supports popular intermittent fasting schedules like 16:8, 18:6, and 20:4.
- Offers easy-to-understand results that help you stay on track with your fasting routine.
Why This Calculator:
- Helps you create a fasting schedule tailored to your specific body and goals.
- Allows flexibility in fasting methods, making it easy to find a plan that works for you.
- Offers clear, straightforward guidance on your daily calorie needs, so you don’t have to worry about guessing how much to eat.

3. Water Fasting Weight Loss Calculator by IF Calculator
The Water Fasting Weight Loss Calculator helps estimate how much weight you could potentially lose during a water fast. This tool takes into account your current weight, height, age, activity level, and the duration of your fast to give a personalized estimate. Water fasting, which involves abstaining from food and consuming only water for a set period, has become popular due to its weight loss and detox benefits. This calculator makes it easier for you to track your progress, stay motivated, and ensure you are staying on track with your fasting goals.
Water fasting can lead to rapid weight loss and a variety of health benefits like improved metabolism, detoxification, and mental clarity. However, estimating the amount of weight loss can be tricky, especially since it varies based on several factors. The Water Fasting Calculator simplifies this process by giving you an estimate that reflects your unique body composition and fasting duration. It’s an invaluable tool for anyone interested in water fasting for weight loss or health improvement.
Functions:
- Estimates potential weight loss based on your fasting duration, weight, height, and activity level.
- Provides customized weight loss predictions to help you track your fasting progress.
- Calculates based on factors like basal metabolic rate (BMR), activity level, and adaptive thermogenesis.
- Helps set realistic expectations by showing potential weight loss across different fasting periods.
Why This Calculator:
- Offers personalized estimates that take your specific body type and fasting duration into account.
- Keeps you motivated by tracking your progress and visualizing your potential results.
- Helps prevent over-fasting by providing an estimate and promoting a balanced approach to fasting.

4. Welltech Intermittent Fasting Calculator
The Welltech Intermittent Fasting Calculator is designed to simplify your fasting schedule, helping you determine your feeding and fasting windows. By inputting your desired fasting protocol and feeding window start time, this tool quickly calculates your personalized schedule. Whether you’re following the popular 16:8 method or another approach, the calculator ensures that you stay organized and on track throughout your fasting journey. It’s especially helpful for those with busy schedules or shift work, as it allows you to tailor your fasting and eating times to your day.
This tool supports a variety of fasting protocols, including 14/10, 16/8, and 18/6, and allows for customization of fasting durations. The calculator is easy to use and gives you a clear visual of when to start and stop eating, which makes adhering to an intermittent fasting plan easier. It’s a great resource for anyone looking to optimize their fasting routine for weight loss or overall health.
Functions:
- Calculates personalized fasting and eating windows based on your selected protocol and preferences.
- Supports common intermittent fasting schedules like 14/10, 16/8, and 18/6, with custom options available.
- Displays results in both 12-hour and 24-hour time formats for flexibility.
- Helps structure your fasting routine to match your lifestyle and goals, making it easier to follow.
Why This Calculator:
- Makes intermittent fasting more accessible by giving you a simple, organized fasting schedule.
- Allows flexibility with both standard and custom fasting durations to suit your preferences.
- Easy to use, even for beginners, ensuring that fasting becomes a manageable part of your routine.

5. Healthy Eater Intermittent Fasting Calculator
The Healthy Eater Intermittent Fasting Calculator is a user-friendly tool designed to help you determine the best fasting and eating windows for your specific goals. By entering details like your age, weight, height, activity level, and chosen fasting method, this calculator provides you with a structured fasting plan to follow. Whether you prefer the 16/8 method, the 5:2 diet, or alternate-day fasting, this tool takes the guesswork out of your routine and ensures that you stay on track with your weight loss or health goals.
This calculator is designed to work with several popular fasting methods, allowing you to choose what fits your lifestyle best. You can easily adjust your fasting times based on your preferences, ensuring that it complements your daily routine. It’s especially helpful for people who are new to intermittent fasting and need a clear guide to get started.
Functions:
- Calculates your fasting and eating windows based on your age, weight, height, activity level, and chosen fasting method.
- Supports various fasting protocols, including 16/8, 5:2, and alternate-day fasting.
- Provides a structured plan to follow, making it easier to stick to your fasting goals.
- Offers flexibility to adjust your fasting schedule to fit your personal lifestyle and preferences.
Why This Calculator:
- Helps simplify the process of intermittent fasting by providing you with an easy-to-follow, personalized fasting schedule.
- Allows you to select from several popular fasting methods, ensuring a plan that works for you.
- Ideal for beginners, as it takes the guesswork out of fasting and helps you stay consistent with your weight loss journey.

6. Fastic Intermittent Fasting Calculator
The Fastic Intermittent Fasting Calculator is a comprehensive tool designed to optimize your fasting experience. This calculator not only helps you determine the best fasting and eating windows for your goals but also provides personalized insights into your fasting routine. By entering your details, such as age, weight, activity level, and chosen fasting method, you’ll receive a custom fasting plan that fits your lifestyle. Whether you’re aiming to lose weight, improve health, or build muscle, the Fastic calculator is tailored to support your specific needs.
With its ability to calculate fasting time, track your progress, and give you accurate estimates of when you might reach your goals, the Fastic calculator is a powerful tool for anyone serious about intermittent fasting. Plus, it offers valuable tips for staying on track and optimizing your efforts. Whether you’re a beginner or an experienced faster, it ensures that your fasting journey is structured and achievable.

Functions:
- Customizes fasting schedules based on your personal details, including activity level and fasting method.
- Tracks progress by calculating calorie intake, water consumption, and exercise during fasting.
- Provides detailed reports on your fasting times and estimated weight loss.
- Allows flexibility by offering multiple fasting methods like 16/8, 5:2, and alternate-day fasting.
Why This Calculator:
- Ideal for both beginners and experienced fasters, offering a flexible and personalized fasting schedule.
- Helps track multiple factors, including calories, exercise, and hydration, to ensure a balanced fasting journey.
- Provides motivation and accountability by showing your progress and reminding you of your goals, helping you stay committed.

7. Fitness Volt Water Fasting Weight Loss Calculator
The Fitness Volt Water Fasting Weight Loss Calculator is a simple yet effective tool designed to help you estimate how much weight you can lose during a water-only fast. Water fasting, while tough, is known for its rapid weight loss benefits, and this calculator takes into account key factors such as your current weight, gender, and fasting duration to predict how much weight you might shed. Whether you’re embarking on a short 24-hour fast or a more extended water fast, this tool can give you a clear idea of the weight loss you can expect.
This calculator helps you make informed decisions about your water fasting journey by providing approximate weight loss estimates. It’s especially useful for those who want a realistic view of how much weight they can lose without the distractions of food intake. While it offers estimates, it’s important to note that actual weight loss can vary depending on individual factors like metabolism, activity levels, and sleep.
Functions:
- Estimates weight loss based on current weight, fasting duration, and gender.
- Provides an approximate new weight after the fast, helping you gauge progress.
- Customizable for both imperial (pounds) and metric (kilograms) units.
- Gives users a clearer understanding of potential results, motivating them to continue their fasting journey.
Why This Calculator:
- Offers a clear and simple way to track and predict weight loss during a water fast.
- Helps users set realistic goals by providing an estimate of how much weight they can lose during a fast.
- Encourages safe fasting practices by providing insights that help plan appropriate fasting durations based on individual body composition.

8. Awesome Health Club Intermittent Fasting Calculator
The Awesome Health Club Intermittent Fasting Calculator is a versatile and personalized tool designed to help you determine the best fasting schedule for your health and weight loss goals. By entering key details like your age, gender, height, weight, activity level, and chosen fasting method, this calculator helps tailor a fasting plan that suits your unique needs. Whether you’re a beginner or someone experienced with intermittent fasting, this tool ensures you have the right plan in place to maximize your results.
This calculator provides recommendations for a variety of intermittent fasting methods, such as the popular 16/8, 18/6, and OMAD (One Meal a Day). It calculates your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR), adjusting your calorie intake to fit your fasting schedule. The flexibility to adjust your fasting window makes it easy to integrate into your daily life, whether you’re a night owl or an early riser.
Functions:
- Customizes fasting schedules based on personal data such as age, gender, weight, height, and activity level.
- Calculates your BMR and TDEE to provide precise calorie recommendations based on your chosen fasting method.
- Supports multiple fasting protocols like 16/8, 18/6, OMAD, and the 5:2 diet.
- Helps you optimize meal timing and calorie intake to stay on track with your health and weight loss goals.
Why This Calculator:
- Personalizes your fasting and calorie recommendations, making intermittent fasting easier to follow.
- Tracks key metrics like BMR and TDEE, offering accurate insights into your body’s calorie requirements.
- Offers flexibility with various fasting methods, allowing you to choose the one that best fits your lifestyle and preferences.

9. Calculator Academy Water Fast Weight Loss Calculator
The Calculator Academy Water Fast Weight Loss Calculator is designed to help you estimate the potential weight loss during a water-only fast. By inputting your daily calorie burn and the number of days you plan to fast, this tool calculates how much weight you could lose based on your energy expenditure. This calculator is perfect for those who want to understand the impact of water fasting on their weight loss journey.
This tool is simple and intuitive to use. It relies on a straightforward formula that multiplies your daily calorie burn by the number of fasting days and divides the result by 3,500 (the approximate number of calories in one pound of fat). It provides a quick estimate of how much weight you might lose during your water fast, offering a helpful perspective on the potential results of your fasting routine.
Functions:
- Calculates water fast weight loss based on your daily calorie burn and fasting duration.
- Uses a simple formula to provide weight loss estimates based on energy expenditure.
- Allows you to input either daily calorie burn or days of fasting to calculate the missing variable.
- Provides an easy-to-understand approach to track potential weight loss during water fasting.
Why This Calculator:
- Gives quick and straightforward estimates of weight loss during a water fast based on real-time data.
- Easy to use, helping users get fast results without complicated inputs or calculations.
- Helps track the effectiveness of water fasting by providing a clear picture of how much weight could be lost over time based on your calorie burn.

10. Belly Clock Intermittent Fasting Calculator
Belly Clock is an all-in-one fasting app that offers a comprehensive, personalized approach to intermittent fasting. It helps you create tailored fasting schedules, track hydration, and stay connected with a supportive community of fasters. Whether you’re aiming for weight loss, better energy, or spiritual practices like Ramadan, Belly Clock adapts to your unique goals and lifestyle. The app also offers detailed analytics, a fasting journal, and AI coaching, all designed to make your fasting journey both effective and enjoyable.
The app supports a variety of fasting methods such as 16:8, 18:6, OMAD, and more, providing customizable plans that adjust based on your preferences and objectives. With its combination of science-backed tools and personalized guidance, Belly Clock helps you sync your fasting routine with your body’s natural rhythm for sustainable results.
Functions:
- Offers a range of fasting methods, including 16:8, OMAD, and custom schedules, tailored to your goals.
- Provides hydration tracking with personalized water intake recommendations and reminders.
- Visualizes your progress with detailed charts and statistics, keeping you motivated.
- Includes community support and the ability to share your progress or participate in fasting challenges.
Why This Calculator:
- Tailors fasting plans to fit your specific goals, lifestyle, and preferences, ensuring a personalized experience.
- Helps maintain consistent hydration and provides regular reminders, supporting your fasting efforts.
- Encourages community engagement and accountability, making it easier to stay on track with your fasting goals.

11. FastingCalc Intermittent Fasting Calculator
FastingCalc is a user-friendly and comprehensive tool designed to help you optimize your intermittent fasting schedule based on your personal goals and lifestyle. The app allows you to choose from a variety of fasting methods, including the popular 16:8, 18:6, and OMAD (One Meal a Day), tailoring your fasting times to what suits you best. Whether you’re just starting or you’re an experienced faster, this calculator helps you stay on track with your fasting journey by providing a personalized, easy-to-follow schedule.
FastingCalc also provides practical fasting tips, such as starting slow with the 12:12 method if you’re new to fasting and gradually increasing your fasting window. The app encourages mindful eating during the eating window and promotes staying hydrated with water or tea. With its simple interface, it’s a great tool for anyone looking to implement intermittent fasting effectively.
Functions:
- Offers multiple fasting schedules, such as 16:8, 18:6, and 20:4, allowing you to choose what works best for you.
- Provides an easy-to-use interface to calculate your fasting and eating windows based on your preferred start time.
- Includes helpful fasting tips, such as staying hydrated, focusing on nutrient-dense foods, and practicing mindful eating.
- Tracks your fasting history and progress, helping you stay motivated and consistent.
Why This Calculator:
- Customizes your fasting schedule to fit your individual goals and lifestyle, ensuring a personalized fasting experience.
- Guides you through the fasting process with useful tips and best practices, making fasting easier and more sustainable.
- Tracks your progress and history, allowing you to visualize your success and stay consistent with your fasting routine.
Conclusion
Choosing the right fasting weight loss calculator can significantly enhance your fasting journey by providing personalized insights and helping you stay on track with your goals. Whether you’re looking to lose weight, improve your health, or build muscle, these calculators take the guesswork out of meal timing, calorie intake, and fasting schedules. From simple tools for beginners to more advanced features for experienced fasters, there’s a calculator out there that suits your needs. By incorporating one of these calculators into your routine, you’ll be better equipped to manage your fasting journey, track progress, and achieve your desired results with ease. Remember, consistency and the right tools are key to successful and sustainable weight loss!