Water Fasting Weight Loss Calculator

Water fasting has become a popular type of activity that can be both beneficial and cleansing for your body. Water fasting may help you lose weight, with this calculator you can estimate how much you may lose.

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What it is

What is Water Fasting?

Create Date: July 12, 2024

Last Modified Date: December 16, 2024

Water fasting is a type of dietary restriction where you will only drink water for a set amount of time. During this time people will not consume any food and will only drink water in hopes of detoxing, losing weight, or another similar reason.

How to Calculate Water Fasting Weight Loss

Calculating how much weight you can lose from doing a water fast is a nearly impossible task. While water fasting is something that a lot of people do to lose weight there is no set amount of weight you will lose per day of fasting, there are just too many variables. For that reason, any calculations done for water fasting weight loss should be taken with a grain of salt. If you are using our tool to estimate the amount of weight that will be lost, this is the formula that we employ:

An image of the formula used to calculate how much weight you may lose from doing a water fast for a set number of days.
Where:
  • EWL = Estimated weight loss

  • DCB = Daily calories burned (2,500 for men, 2,000 for women)

  • FD = Fasting duration

Understanding Your Results

When you use this tool you get two results, the total amount of weight you may lose based on your entries and what your new weight would be after the fast. These numbers are displayed in the unit of measurement that you used for your weight. If your weight is in pounds the answer you get is also in pounds. Again, these numbers are estimated and they may be vastly incorrect due to there being many different variables for everyone and how their body and current health status is. Additionally, this tool does not scale with weight as there is not enough data to support how weight impacts the effects of water fasting.

How to Use the Water Fasting Weight Loss Tool

If you want to get an idea of how much weight you can lose from doing a water fast you are in the right place. Our tool estimates how much you may lose from a certain period of water fasting in a very simple and easy to use fashion. The steps involved with using this tool include:

  1. Enter current weight and select the proper unit of weight measurement.

  2. Enter the number of days that you plan to do the water fast for.

  3. Choose from the dropdown your sex.

  4. Hit the calculate button and instantly get your results.

Calculation Example

We are starting the new year off on a health journey and decided to do a water fast. We can use this tool to get an idea of how much weight we may be able to lose from doing it. We will enter our weight into the first field, 165 pounds, then we will enter the length of our water fast which will be 7 days. We are a male so we will keep that dropdown choice as it is. We can now hit calculate and we get an estimated weight loss of 5 pounds making our new weight after the fast 160 pounds.

Weight loss varies depending on factors such as body composition, metabolism, and fasting duration. On average, people may lose about 1–2 pounds per day during the initial stages, though much of this may be water weight.

No, water fasting is not safe for everyone. It is not recommended for people with certain medical conditions, pregnant or breastfeeding women, or those with a history of eating disorders. Consult with a healthcare professional before starting a water fast.

Breaking a fast requires care to avoid digestive discomfort. Start with small, easily digestible foods such as fruit, soup, or broth, and gradually reintroduce regular meals over a day or two.

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