Unraveling the Mystery: How Much Does a Spider Weigh?

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Have you ever wondered, “How much does a spider weigh?” It’s an interesting question that you may have pondered, but never been able to answer. This article will uncover the answer by exploring the weight of different types of spiders. We’ll look at the size and mass of spiders, and explore how spider size affects the spider’s weight. We’ll also discuss the average weight of a spider and compare it to the weight of other insects. By the end of this article, you’ll have a much better understanding of how much a spider really weighs!

Classification of Spiders

Classification Of Spiders

Spiders are arthropods and members of the class Arachnida. While there are thousands of species of spiders around the world, they can all be divided into two main categories: mygalomorphae and araneomorphae. Mygalomorphae, also known as the primitive spiders, are typically characterized by having two pairs of book lungs, four pairs of walking legs and a pair of pedipalps (pincer-like appendages) that are used for mating and for grabbing prey. These spiders also have a movable lower jaw and a cephalothorax (the fusion of the head and thorax). Araneomorphae, or the modern spiders, have three pairs of book lungs, four pairs of walking legs and a pair of pedipalps that are used for mating and as venom delivery systems. These spiders also have a fixed lower jaw and a cephalothorax.

Spiders can be further divided into different families, such as tarantulas, wolf spiders, jumping spiders, and orb weavers. Tarantulas are large hairy spiders found mainly in tropical and subtropical regions. Wolf spiders are small to medium-sized spiders that are usually found in dark corners in the home and in outdoor areas. Jumping spiders are small spiders found in a range of habitats, and are known for their ability to jump several times their own body length. Orb weavers are typically found in gardens, fields and woodlands, and are known for the intricate webs they weave.

Factors Affecting Weight

Factors Affecting Weight

  • Size: Larger spiders have more mass and therefore weigh more than smaller spiders.
  • Age: Younger spiders are lighter compared to adult spiders due to the incomplete development of their internal organs.
  • Gender: Male spiders are generally lighter than female spiders due to their smaller size.
  • Habitat: Spiders living in higher altitudes tend to be lighter than those living in lower altitudes due to the lower air density.
  • Time of Year: Spiders tend to weigh more in the summer due to the higher food availability.
  • Diet: Spiders that eat more will weigh more than spiders on a lighter diet.

Average Weight of Spiders

  • Spiders range from 0.05 milligrams to 6 ounces (170 grams).
  • The average spider weighs about 0.067 ounces (1.9 grams).
  • Tarantulas typically weigh 0.6 ounces to 11 ounces (17-312 grams).
  • Bigger spiders, such as the Goliath birdeater, can weigh up to 6 ounces (170 grams).
  • Smaller spiders, such as the jumping spider, weigh between 0.05 milligrams to 0.2 ounces (5-6 grams).

Variations in Weight

Variations In Weight

Spider Species Weight (in milligrams)
Goliath Birdeater 1.5 to 2.5
Brazilian Salmon Pink Birdeater 5.5 to 15.5
Giant Huntsman 0.3 to 6.2
Tarantula 0.02 to 4.5

Weight of spiders vary significantly depending on the species. For example, Goliath Birdeater weighs 1.5 to 2.5 milligrams, Brazilian Salmon Pink Birdeater weighs 5.5 to 15.5 milligrams, Giant Huntsman spider weighs 0.3 to 6.2 milligrams, and Tarantula spider weighs 0.02 to 4.5 milligrams.

Weight of Different Types of Spiders

Weight Of Different Types Of Spiders

The weight of spiders varies greatly depending on the species. Wolf spiders, for example, are among the largest species and can weigh up to 3.5 grams, while the smallest species, such as the dwarf spider, can weigh as little as 0.005 grams. Jumping spiders can weigh up to 0.7 grams, while tarantulas can weigh as much as 85 grams. The weight of a spider can also depend on the size of its abdomen, which can increase in size as the spider feeds.

Weight of Giant Spiders

Giant spiders have a wide range of weights, depending on the species. For example, the Goliath birdeater (Theraphosa blondi), the world’s largest spider by leg span, can weigh up to 6 ounces (170 grams). The giant huntsman spider (Heteropoda maxima), can weigh up to 4.4 ounces (125 grams). The giant crab spider (Olios giganteus), can weigh up to 0.5 ounces (15 grams). The Brazilian salmon pink birdeater (Lasiodora parahybana) can weigh up to 2 ounces (57 grams). The Chilean rose tarantula (Grammostola rosea) can weigh up to 0.7 ounces (20 grams). The Mexican redknee tarantula (Brachypelma smithi) can weigh up to 0.5 ounces (15 grams).

Weight of Baby Spiders

  • The weight of baby spiders depends on the type of spider and can range from 0.1 milligrams to 1 milligram.
  • Baby spiders are usually much lighter than their adult counterparts, which can range from 1 milligram to 1 gram.
  • The average weight of a baby spider is around 0.5 milligrams.
  • The size and weight of a baby spider can vary greatly depending on the type of spider, as some species are much larger than others.

Frequently Asked Questions

What is the Average Weight of a Spider?

The average weight of a spider is between 0.000035 and 0.0035 ounces, or 0.0001 and 0.01 grams. This is significantly lighter than the average weight of a human, which is around 120 pounds (54.4 kilograms). This is due to the small size of spiders, which generally range from 0.04 to 1.18 inches (1 to 30 millimeters) in length.

How does the weight of a spider vary from species to species?

The weight of a spider can vary greatly depending on the species. For example, a small jumping spider may weigh only a few milligrams, while a large tarantula may weigh up to 50 or 60 grams. Spiders are typically quite light compared to other animals, but the exact weight of a spider will depend on its size, species, and sex.

Are there any unusually heavy or light spiders?

Spiders vary in size and weight, but generally, the size of spiders doesn’t affect their weight. While some spiders can weigh as little as 0.4 milligrams, others can weigh up to 170 milligrams. Most spiders, however, weigh between 1-100 milligrams. Tarantulas are among the heaviest spiders, weighing up to 170 milligrams. The lightest spiders usually belong to the Linyphiidae family, which can weigh as little as 0.4 milligrams.

Does the Size of a Spider Affect Its Weight?

Yes, the size of a spider does affect its weight. Smaller spiders are generally lighter than larger spiders. This is because a spider’s body is composed of an exoskeleton, which is a hard outer shell that provides support and protection. The bigger the spider, the more support and protection its exoskeleton needs, and thus the heavier the spider. However, the type of spider and the density of its exoskeleton also affect its weight.

Are there any factors that influence the weight of a spider?

The weight of a spider is determined by the type of spider, its age, and the size of its body. The size of the spider’s body can vary greatly depending on the species and its environment. Spiders that live in cooler climates tend to be larger than those that live in warmer climates. Additionally, spiders that live in areas with more food, such as near ponds and rivers, may also be larger than spiders living in drier, less food-rich environments. Age can also be a factor, with older spiders often being heavier than younger spiders. Similarly, the size of a spider’s abdomen and the amount of stored food can also affect its overall weight.


Spiders are among the smallest animals in the world, and yet they have a surprisingly wide range of weights. Depending on the species, spiders can weigh anywhere from 0.0003 ounces to up to 6 ounces. Spiders can achieve these weights due to their unique exoskeleton and ability to eat large prey. Due to their light weight and small size, spiders are able to travel and move quickly, and even survive in extreme environmental conditions.

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