Average Guinea Pig Weight – How Much Should a Guinea Pig Weigh?

The guinea pig skeleton is unlike those of other animals such as dogs, cats, and rabbits. That’s why determining the body condition score of a guinea pig is challenging for owners.

It is essential to keep guinea pigs at a healthy weight since overweight or under-weight guinea pigs are prone to a variety of health concerns. So, the pet parents should know how much a guinea pig should weigh?

This article will discuss the average weight of different breeds of guinea pigs at various stages of life as well as how to identify skinny or fat guinea pigs.

Cute Reptiles as Pets
Cute Reptiles as Pets

How Much Should a Guinea Pig Weigh?

How Much Should a Guinea Pig Weigh?

A baby guinea pig’s average weight on the first day is 80 to 100 grams, and after 12 to 16 weeks, he or she achieves adult weight. In terms of size and weight, male guinea pigs are larger and heavier than females.

A male’s typical body weight is 900 to 1200 grams, whereas a female’s average body weight is 700 to 900 grams.

Some guinea pigs have gained more weight than the average or standard weight, but this is uncommon.

Guinea pigs are energetic animals who keep their weight in check by running, walking, and playing. However, as they become older, their weight rises due to a decrease in physical activity.

Also read: Baby Guinea Pigs: Everything You Need to Know

Average Guinea Pig Weigh by Age

To keep a guinea pig fit and smart, you must know the standard or average by age. Weight gain or loss in guinea pigs might be an indication of disease.

Guinea pigs are not as large as rabbits, but they are larger than hamsters. So, here’s how much guinea pigs weigh at different ages. 

AgeWeightLength
Birth80 to 100 grams2 to 3 inches
4 weeks250 to 400 grams4 to 6 inches
8 weeks400 to 650 grams6 to 8 inches
12 weeks700 to 900 grams8 to 9 inches
16 weeks900 to 1000 grams9 to 11 inches
14 months1000 to 1200 grams11 to 12 inches
Comparison of Guinea Pig Weigh by Age

Average Guinea Pig Weigh by Breeds

Guinea pigs’ average weight and size vary depending on the breed. Rex is the largest guinea pig that may be kept as a pet, weighing between 800 and 1600 grams on average.

The Ridgeback is the smallest guinea pig, weighing between 700 and 1100 grams.

Guinea pigsBaby weightAdult weight
American guinea pig80 to 100 grams700 to 1100 grams
White-crested guinea pig80 to 110 grams1000 to 1200 grams
Abyssinian85 to 105 grams900 to 1350 grams
Peruvian80 to 110 grams900 to 1400 grams
Silkie80 to 110 grams800 to 1200 grams
Coronet85 to 105 grams700 to 1350 grams
Texel85 to 110 grams900 to 1200 grams
Sheba100 to 110 grams800 to 1200 grams
Teddy85 to 110 grams900 to 1400 grams
Skinny 60 to 110 grams700 to 1100 grams
Baldwin80 to 110 grams800 to 1200 grams
Rex 110 to 150 grams900 to 1650 grams
Ridgeback 80 to 100 grams700 to 1100 grams
Comparison of Guinea Pig Weigh by Breeds

Also read: Guinea Pig Size Guide With 4 Factors You Must Know

How To Tell If Your Guinea Pig Is Overweight

How To Tell If Your Guinea Pig Is Overweight

An obese guinea pig appears to be a round, squishy object. An overweight guinea pig ribs, shoulder, and hip bones are not visible.

You can feel these structures by applying pressure on your fingers. Aside from that, the guinea pig will be lethargic and slow to walk.

An overweight guinea pig is also called an obese guinea pig. Obesity renders guinea pigs more vulnerable to illnesses like heart disease, diabetes, and joint problems.

Obesity is caused by consuming too much fat, carbs, and in certain cases, autoimmune problems.

Regular exercise and a limited food supply are the most effective ways to lose weight and overcome obesity.

A vet can help you create a diet menu for your obese guinea pig. Follow the menu and exercise and play with your pet on a regular basis.

Also read: Fat Guinea Pig (Causes & Dangers of Health)

How To Tell If Your Guinea Pig Is Underweight

How To Tell If Your Guinea Pig Is Underweight

An underweight guinea pig ribs, hip, and spine joints are plainly evident. These bones can be felt when you touch the guinea pig. A guinea pig is considered underweight if it loses more than 5 or 10% of its body weight.

Being Underweight can be caused by a variety of factors, including underlying diseases, loss of appetite, a poor diet, digestive issues, and a negative energy balance.

Underweight is most commonly caused by severe diarrhea caused by contaminated food.

If the guinea pig has a disease, it must be treated in order for it to regain its normal weight. After that, provide fresh veggies and guinea pig’s favorite goodies.

To get a multivitamin supplement for your underweight guinea pig, consult a veterinarian.

Also read: How to Help a Guinea Pig Gain Weight

How To Weigh My Guinea Pig

How To Weigh My Guinea Pig

You can weigh guinea pigs by using a gram scale that may be mechanical or digital. Weigh a box with four sides closed, then place the guinea pig in a box and weigh it on the gram scale.

The weight of your pet is calculated by subtracting the weight of the box from the overall weight (box + box with guinea pig).

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Average Guinea Pig Weight FAQs

What is a healthy weight for a guinea pig?

A healthy guinea pig weighs between 900 and 1200 grams. It may, however, vary depending on the guinea pig’s age and breed.

Can a guinea pig be overweight?

Yes, because they eat so much, guinea pigs have a significant risk of becoming overweight. They will not hesitate to eat if you supply food at all times. Obesity was also found in guinea pigs who were overfed and did not get enough exercise.

How much should a 7-year-old guinea pig weigh?

The weight of a 7-year-old guinea pig should be between 1000 and 1200 grams. However, it is dependent on the breed. For example, 7-year-old Rex should have a weight of 1200 to 1600 grams.

How big is a 6-week-old guinea pig?

The weight of a 6-week-old guinea pig should be between 350 and 500 grams. Guinea pigs develop quickly and acquire weight. They have the ability to gain up to 20 grams of weight per day.

How big is a 6-month guinea pig?

950 to 1050 grams is the average or standard weight of a six-month-old guinea pig. Guinea pigs do not gain weight quickly after 6 months as their growth rate slows. Guinea pigs reach a weight of 1200 grams at the age of 14 or 12 months.

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Wrapping Up

Because guinea pigs grow at varying rates, their weight and size vary from breed to breed.

Adult guinea pigs, on the other hand, weigh between 900 and 1200 grams and measure between 8 and 12 inches in length. 

Exceeding this weight range can be a sign of being overweight or underweight. Guinea pigs can face some health problems if this condition persists. Owners need to monitor the weight of guinea pigs regularly to promptly adjust the diet.

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