Cat Calorie Calculator

 The total daily calories a cat needs depend mostly on the cats weight, age, how active the cat is and the cats health.

For example a young and active cat needs energy relative to its weight than a senior inactive cat. Overweight cats might need a controlled amount of calories than food that matches their current weight.

I think the best way to find the right calorie intake is to treat it as an estimate. Watch the cats weight over time. Change the cats calories as needed.

How to Calculate Cat Calories?

Calculating your cats caloric intake is easy:

Enter the cats weight.

Specify the cats life stage (kitten, adult, senior).

Indicate the cats activity level or lifestyle.

Check the estimated number of calories per day.

Compare the result with the calories listed on the cats food label.

If the cat is trying to lose or gain weight change the cats calories accordingly. A veterinarian can help with that.

How the Cat Calorie Calculator Works

First the calculator finds the cats Resting Energy Requirement (RER). It then multiplies that number by a factor that depends on the cats life stage and conditions.

A common formula veterinarians use to find RER is:

RER = 70 × (body weight in kg)^0.75

The resulting number is then multiplied by a factor to find the cats Maintenance Energy Requirement (MER).

MER = RER × life-stage/lifestyle factor

The factor can vary from one cat to another. Kittens, intact adult cats, neutered adult cats, inactive cats and cats that need weight control can all need amounts of energy.

Example

Consider a cat that weighs 4 kg.

Using the RER formula:

RER = 70 × (4)^0.75

the RER comes out to about 198 calories per day.

Depending on the cats life stage and lifestyle the cats maintenance calories will differ.

That is why using a fixed calorie number for every cat is not reliable.

What Is RER, for Cats?

RER stands for Resting Energy Requirement. RER is the amount of energy a cat needs when it is resting under conditions.

The common formula is:

RER = 70 × (kg body weight)^0.75

RER is not necessarily the same as the number of calories a cat should eat every day; a cat’s daily calorie requirements may also be affected by growth, activity, neutering status, pregnancy, lactation, and weight-management goals.

RER vs. MER for Cats

These terms are often mixed up.

RER — Resting Energy Requirement

RER is an estimate of the energy required to maintain basic bodily functions at rest.

RER = 70 × kg^0.75

MER — Maintenance Energy Requirement

MER is an estimate of the energy required to meet a cat’s daily needs.

MER = RER × appropriate factor

Because each cat has different lifestyles and physiological needs, the factor for estimating MER can vary.

How Many Calories Should My Cat Eat?

There is no single-calorie number that fits all cats.

Two cats of the same weight can have very different calorie requirements due to:

• Age
• Activity level
• Body condition
• Neutering status
• Growth
• Pregnancy or lactation
• Health conditions
• Weight-loss or weight-gain goals
• Individual metabolism

Hence, calorie calculators should be used as an estimate and a starting point, rather than an exact prescription.

Cat Calories by Weight

A cat’s calorie requirement generally increases as the cat’s body weight increases, though it does not increase one-to-one.

For instance, a 6 kg cat does not necessarily need 50% more calories than a 4 kg cat because veterinary energy calculations commonly involve metabolic body weight, which is expressed as the cat’s body weight to the 0.75 power.

Use the calculator above for a better estimate based on your cat’s individual weight and circumstances.

How Many Calories Does a Kitten Need?

Kittens are growing rapidly and hence have higher energy requirements than their adult counterparts on a body size basis.

Their calorie needs can change significantly as they grow, so kitten feeding should be based on an appropriate growth diet and regular monitoring of the body condition.

When calculating the calorie needs for kittens, it is especially important not to use an adult cat’s calorie target without considering their growth requirements.

How Many Calories Does an Adult Cat Need?

An adult cat needs enough calories to maintain a healthy body weight and support normal activity.

An indoor, neutered cat that spends most of the day sleeping may need fewer calories than a highly active adult cat.

Instead of relying solely on age or weight, use a cat’s overall body condition and activity level to determine an appropriate feeding amount.

How Many Calories Does an older Cat Need?

older cats can have different nutritional and energy needs based on their health and activity level.

While some older cats may become less active and thus require fewer calories, others may lose weight or have health issues that affect their nutritional requirements.

Unexplained weight loss or gain in an older cat should be discussed with a veterinarian.

Cat Calorie Calculator for Weight Loss

If your cat is overweight, reducing their food dramatically is not the safest plan.

A weight-loss plan should consider your cat’s current body condition, target weight, food type, activity level, and overall health.

A veterinarian can help set a safe calorie target and monitor your cat’s progress; weight should generally be reduced gradually rather than severely restricted in calories.

Cat Calorie Calculator for Weight Gain

Cats that are underweight may need extra calories, but unexplained weight loss can sometimes be an indication of an underlying medical problem.

If your cat is losing weight despite eating normally, eating more than usual, or showing other changes in behavior or health, consult a veterinarian before just increasing their food intake.

How to Convert Calories Into Food Portions

Once you know your cat’s estimated daily calorie requirement, you can use the calorie information on the food label to calculate an approximate daily portion.

For instance:

Daily food amount = Daily calorie requirement ÷ calories per gram of food

If thefood label provides calories per can, pouch, or cup rather than calories per gram, divide your cat’s estimated daily calories by the calories in one serving.

Example

If your cat’s estimated daily requirement is 200 calories and one can contains 100 calories:

200 ÷ 100 = 2 cans per day

This is just an example; always make sure you are using the actual calorie contents of your cat’s food and also take into account treats and other foods.

Don’t Forget Treats

Treats also contain calories.

If your cat receives treats, table food, supplements, or other calorie-containing foods, their calories should be taken into account as part of the overall daily intake.

Feeding only the recommended amount of main food without considering treats can result in a much higher calorie intake than expected.

What Factors Affect a Cat’s Calorie Needs?

Several factors can affect how many calories a cat needs per day.

Body Weight

Larger cats generally require more energy than smaller cats, although calorie requirements do not increase directly in line with body weight.

Age

Kittens have different energy requirements than adult and senior cats, as they grow and develop.

Neutering

Neutered cats may have different energy requirements from intact cats, and their food intake should be adjusted to help maintain a healthy body condition.

Body Condition

Two cats on the same weight can have very different body compositions, so body condition is an important consideration in determining whether a cat is at a healthy weight.

Health

Medical conditions can have a significant impact on calorie and nutritional requirements; cats with health problems should be provided individualized guidance from a veterinarian.

Cat Calorie Calculator Formula

The basic RER formula that many veterinary nutrition calculations use is:

RER = 70 × (body weight in kilograms)^0.75

The estimated maintenance requirement can then be predicted using:

MER = RER × appropriate factor

The appropriate factor depends on the cat’s life stage and individual needs.

Weight Conversion

If your cat’s weight is given in pounds, convert it to kilograms first:

Kilograms = pounds ÷ 2.205

For instance:

10 lb ÷ 2.205 ≈ 4.54 kg

The calculator can handle these conversions automatically.