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# Cat BMI Calculator

How to take measurements for the cat BMI calculator?What does the result mean? FBMI rangesHow to help your cat lose weight?

Cats are known to be fluffy, so it may be difficult to tell when there is a little bit too much of your pet friend to love. Weighing your pet is not enough - a healthy cat weight depends on many factors such as its breed, age, sex... Our cat BMI calculator is designed to save you the hassle and answer the burning question "is my cat overweight?" regardless of those. All you need to do is take two measurements!

Unfortunately, obesity is becoming more and more common amongst domestic cats. Of course, it is difficult to resist our fluffy friends, especially when they ask for a snack, so we may end up overfeeding them. If that happens to be the case, do not worry - in this article, you will find tips on how to help your cat lose weight!

## How to take measurements for the cat BMI calculator?

The cat BMI calculator is based on the , which estimates your cat's body's fat content based on its proportions. It is simple and requires only two measurements. To use it, follow these instructions:

1. Make sure your cat is standing with its head in an upright position.
2. Measure your cat's rib cage. Ideally, you want to do this at the 9th rib level, located by the cat's front legs.
3. Measure the length of your cat's lower back leg from the knee to the ankle.
4. Input measured values into the cat BMI calculator. The result will be found using the following formula:
$\small {\text{FBMI} = \frac{\frac{\text{rib cage}}{0.70622} - \text{leg}}{0.9156} - \text{leg}}.$

Of course, by $\text{rib cage}$ we mean the circumference, whereas $\text{leg}$ relates to the length.
In fact, to make using our cat weight calculator easier, we have prepared a picture illustrating how to take the measurements:

If you compare it with the BMI calculator, you can see that the principle is slightly different, as there's no mention of weight above.

## What does the result mean? FBMI ranges

Although there are five BMI ranges for humans, it was reduced to four for cats. Below, we present the FBMI chart.

FBMI

Interpretation

< 15

Underweight

15 - 29.9

Normal weight

30 - 42

Overweight

42

Obese

To clarify it more, let's use an example. If we consider a cat with a rib cage circumference of 14 inches and a lower back leg of 2 inches, its FBMI is 44.4. Now, if we can change the FBMI value to 29 in the calculator, which is in the healthy weight range, the tool will show us that the target rib cage circumference is approximately 10 inches.

Comparing your result from the calculator with this table will allow you to answer the question posed at the beginning: "Is my cat overweight?" But what to do if the answer is yes?