Weight Loss Calculator


Check out the weight loss percentage calculator and body weight planner to find your ideal body composition with 3D visualization technology.
Get your free detailed report, including macros, target weight and specific muscle to fat levels needed.

[caldera_form id=”CF598595494f357″]

The weight loss percentage calculator that offers more:

  • First, instead of a BMI calculator, we use body-types to slightly alter the ratios of nutrients. This is because BMI is invalid as a body composition measure since it’s doesn’t take into account whether your weight stems from adipose tissue (fat mass) or muscle mass.
  • Secondly, we then takes you through our weight loss percentage calculator, with real time visualization in 3D, technology unique to BellyProof at this time. This allows you to estimate your body fat percentage using a slider and see the changes on a real time model. The model can be male or female, match a certain body type and be muscular or skinny. Then we move the slider to see real life-like changes in how your body changes with more fat content.
  • Lastly, when requesting your report. You will receive a PDF with the predictions and practical advice to get your body weight planning (bwp) back on track.

We use a macro calculator instead of a calorie calculator style report. Traditionally, a calorie calculator will push you to adjust your calories and activity level to accomplish a fitness goal. Our unique system will instead give you ranges of macronutrients. This is a calorie alternative that is more efficient and less misleading when losing weight.


It will then move into the future predication. The weight loss predictor module will foresee your ideal weight and body composition and will give you your target figures. The figures will include how much fat (actual fat tissue) you need to lose and how much muscle you need to build to be at your ideal lean mass. It will also give you – what your final overall weight on scale should be once the needed muscle tissue has been added and fat tissue has been lost.

Why is the percentage of weight loss so important?

We all know that intention and precision matters. We know that from our day to day life and the highly engineered products we use. The same it true for body composition! One of the unique features of this extreme weight loss calculator is its ability to predict how much fat mass and muscle mass adjustment is needed before you can see the changes you seek. It’s very easy to go with a mindset of “let’s just train and see what happens, however long it takes” but it would be an understatement to say it’s effective.

How much more effective your training can be when you can fine tune the numbers you need? Well, you still need to perfect and experiment with methods, but with clarity you increase your chances of creating better changes and faster.

You can use it to assess how effective your program is at weight loss (or otherwise). As long as your are losing body fat percentage (rather than muscle glycogen and water) then the faster the better for your health, assuming you are using natural methods.

Body mass percentage accuracy issues

When it comes to estimating levels of fat, the weight loss percentage calculator has a good level of accuracy. While an eye estimation can sometimes be challenging, it’s important to remember than most consumer devices often misses the actual reading by 2-3%. This means that in lack of professional testing equipment (Dexa / Bodypod), anything is an educated guess.

The difference between the macro calculator to a standard calorie calculator is vast. In a way, both of them are estimations that are far from being accurate (or measurable). However, macronutrients calculation focus on estimating the amount of protein, carbs and fat you should have. The ratios and quantities tend to be a closer match to your actual needs than simply counting calories.

With that, our calculator is far more accurate then the average one you find. Let’s talk about problems with traditional methods:

Traditionally, calculators where used to estimate body mass index, activity levels and daily calorie consumption. They then took the body mass index bmi, current weight and desired goal weight and crunches numbers, almost irresponsibly, concluding that by changing the amount of daily calorie consumption, you could ultimately lose weight and change your body mass.
In reality, nothing is simple. BMI (body mass index) does not take into account body composition which means if you have more muscles, you might register as obese.

On the other hand metabolic rate and calories are far from accurate, it’s hard to estimate them based on activity levels or even food consumption. The legal margin of error is 20% on food products and in most cases, we see a much higher margin of error.


Basic usage of the calculator(s):

  1. Choose your gender, body type and your weight (different units available depending on whether you use the metric system or not).
  2. Select whether you have got a muscular build (and indeed, whether you have muscles) or whether you are skinny. People who are skinny fat typically have very little muscle as well as being overweight..
  3. Once happy with your selection, proceed to create your report.
  4. Select whether you want a copy in your email (this is optional) and create the report.
  5. The report will cover your range of macronutrients, your ideal goal weight, percentage of fat tissue and lean muscle mass to work towards. It will also give you the exact difference in fat and muscle mass from your current body shape to your ideal body shape.

Physique goals and Body Composition Targets

Our report engine includes a first of it’s kind weight loss goal calculator, giving you measurable targets of what you need to achieve.

Besides helping you estimate your current fat levels and giving you a sense of what it would look like when you are leaner, there is another powerful feature shown here. Using reverse percentages formula. we can easily estimate what would be the ideal lean mass that is achievable in the medium term. Using your new ideal weight, we can calculate what a low percentage (10% men and 19% women) should be in terms of actual mass of fat tissue.

This means something new is introduced here. Instead of giving you calories and time-frames, the calculator will give you real achievable targets of how much fat (not water) you must lose and how much mass you need to gain, in the short-medium term, to significantly improve your composition. This is incredibly useful to anyone looking to set better targets and pave a way to achieve them. This would be especially useful with consumer devices that are designed to measure current body composition levels.

Question: Can I compare myself to real-life photos? 

Answer: Yes, absolutely. Try this chart for a great example.

weight loss percentage calculatorQuestion: Can I use my home device to determine my % of fat?

Answer: Some home devices are better than other. If you’ve got a “body composition scale”, they are sometimes consistent but have a large error margin. Handheld devices are often completely unreliable so we would stay away from them. The best methods are DexaScan and BodPod – both of which are considered accurate but aren’t consumer grade devices and often cost money and time for each scan.

A great alternative we like to recommend is the Skulpt / Chisel device which seems to be fairly reliable, easy to use and inexpensive.

How many days to lose weight?

The weight loss goal calculator helps you understand where it is you are trying to get to. But if you’re wondering how much exercise you need to do or how much weight you will lose if you eat 500 calories a day, well… that’s a bit more complex. That depends on the system you use. Of course, there is a tremendous difference between losing weight and losing fat. If you are interested in the latter, you should explore this website further for amazing tips and the signature fat loss program.

Example calculations of weight loss percentage

This has nothing to do with fat loss, but if you are trying to determine the mathematical results of how much weight has been lost:

Using the Imperial system: If your initial weight was 220lbs and your current weight is 180lbs, you would calculate  1-(180 lbs / 210 lbs) = 0.181 or in percentage 18.1% weight loss!.

The same applies in the metric system so if your initial weight was 91kg and your current weight is 87kg you would calculate 1-(87 kg / 91kg) = 0.0439 or in percentage it would round up to 4.4% of weight loss.

While the default is weight loss calculator metric (kg), you can also use imperial units just the same.

How does the body mass composition calculation works?

Once we know your weight, gender and estimated body fat percentage we can estimate your bone mass. This all goes to calculate your lean body mass (or LBM) by taking your weight, reducing your bone mass as well the percentage of fat tissue. We then use specific formulas that are designed to based on large scale statistics and fitness data. We use it to estimate nutrition targets such as water consumption, protein intake and more.

We then use reverse percentages to estimate how far are you from the average fitness magazine model. How much would it take in practical terms to get to that single digit body fat percentage or that muscular look.

By knowing those figures, you have a major advantage as you are working towards specific mass goals,rather than just a total number on the scale that could mean anything from water, fat and muscle. Knowledge is power and having those details can make a true difference to how much you actually know, about what your body is really made out of.

Enjoy the WT Loss Calculator and latest technology it brings. Please help us spread the word and share this with your friends.