Omni Calculator logo

Understanding BMI (body mass index) is one of the most critical metrics in weight management, which is why we have built this BMI weight loss calculator to help you to determine your ideal weight and how much weight you need to lose or gain to get there.

We wrote this article to help you understand what BMI is and how to calculate BMI weight loss and use this metric to determine your healthy weight. This calculator will also allow you to compare your BMI with your peers to help you to assess how healthy you are.

What is the BMI in weight management?

BMI is considered the most vital metrics in weight management. This is because weight alone gives only a little information about this, as an individual's ideal weight will differ from those around them. The BMI is usually based on factors such as your age, sex, and height.

The BMI, also known as the body mass index, was introduced to overcome this obstacle by dividing the weight by the square of the person's height. This ratio is then fitted into different BMI ranges to deduce the healthy weight of the person.

Hence, to understand your ideal weight, we first need to know your ideal BMI, which is discussed in the following sections.

Without further ado, let's dive into understanding how to calculate weight loss based on BMI.

🙋 If you want to get more precise information regarding BMI according to different population groups, feel free to check out BMI calculator for men, BMI calculator for women, and BMI calculator for teens.

How to calculate BMI using the BMI formula?

Using the BMI weight formula involves 3 steps:

  1. Determine your weight

This can be easily done just by standing on the weight scale. You can input your weight in three different units, namely kilograms, pounds, and stones.

  1. Determine your height

The second step is equally easy - just measure your height and input the number into our calculator.

  1. The last step is to calculate the BMI

The BMI can be calculated using the BMI weight formula below:

BMI = weight / height²

If you want to know how to calculate BMI weight loss from two BMI's, then our calculator should help with that issue. We described the procedure of finding weight loss based on BMI in the following section.

How to use this BMI and weight loss calculator?

To use this BMI weight loss calculator, you need to first input your height and your weight. This information will be used to calculate your BMI. You can also choose to input your sex and your age. This will tell you your current BMI percentile.

Next, put in your target BMI and our calculator will tell you your target weight and how much weight you need to gain or lose to reach that point (weight loss according to BMI). Our BMI weight loss calculator will also tell you what will be your BMI percentile once you reach your target BMI.

What is your ideal weight and healthy BMI weight?

There are two ways to determine your healthy BMI weight in weight management.

  1. The first way is to use BMI to determine your ideal weight.

The BMI can be categorized into 5 ranges, as shown below:

  • Underweight: < 18.5
  • Normal weight: 18.5 - 24.9
  • Overweight: 25 - 29.9
  • Obesity: 30 - 35
  • Severe obesity: > 35

Hence, your ideal weight should give you a BMI between 18.5 to 24.9.

  1. Another way of determining your healthy BMI is to use the BMI Prime metric.

BMI Prime represents the range of normal BMI, which is from 18.5 to 24.9 BMI. If your BMI Prime is more than 1, it means that you're overweight and should do something to bring it down.

How do I get to my healthy weight?

So, if your current weight is more than your healthy weight, what should you do? Worry not! There are three main ways that we can advise you on how to lose BMI weight.

  • The first option is to reduce your daily intake of calories. This involves consuming less high-energy food such as rice, potato and eat more food like vegetables and fruits. Our calorie calculator can help you to plan around this.

  • You can also reduce your salt intake. This will help you to avoid fatty, unhealthy food such as junk foods and ready meals.

  • Last, but not least, you should also exercise more regularly. This will not only help you to burn more calories, but it can also potentially increase your basal metabolic rate. You can use Omni running calorie calculator to find out how many calories do you burn while running.


Is BMI different for kids?

In short, yes. The normal BMI calculation does not apply to kids. This is because that their weight and height change with age. Their natural proportion of body fat also changes too.

What is the ideal BMI?

The normal BMI range is between 18.5 to 24.9. This is the BMI range that most people are considered healthy. Your ideal BMI should be in this range so that you are neither overweight nor underweight.

Why is the ideal BMI for men and women is different?

The BMI is different for men and women for a couple of reasons. Men have a different metabolism rate compared to women. The women's bodies is also require more fat due to differences in body structures.

Is the BMI different for athletes?

Yes, the interpretation of BMI is different for athletes. This is because athletes normally have more muscle tissues, causing the normal BMI calculation to be inaccurate for their situation.

Wei Bin Loo
Current BMI
BMI Prime
Target BMI and weight loss
Target BMI
Target BMI prime
Target weight
Weight to loss
Check your BMI percentile
Are you an athlete?
Current percentile
Target percentile
Check out 6 similar bmi calculators ⚖️
BMI (body mass index)BMI for kids (body mass index)BMI for men… 3 more
People also viewed…

Audit-C screen

The Audit-C calculator helps you quickly identify your drinking patterns and whether it's within a normal range.

Korean age

If you're wondering what would your age be from a Korean perspective, use this Korean age calculator to find out.

Social Media Time Alternatives

Check what you could have accomplished if you get out of your social media bubble.


The VLDL calculator estimates VLDL cholesterol level based on triglycerides concentration.
Copyright by Omni Calculator sp. z o.o.
Privacy, Cookies & Terms of Service