How Much Does A Spider Weigh

How Much Does A Spider Weigh ?

In the world of the eight-legged, size and weight can vary immensely. The arachnid kingdom offers an intriguing array of weights and sizes, from minuscule spiders barely perceptible to the human eye to the giant tarantulas that would make even the bravest shudder.

This article explores the realm of spider weights, providing fascinating insights into how much these tiny creatures might tip the scales. Whether you’re wondering about spider weight in kilograms or pounds, we’ve got you covered.

Spiders can weigh anywhere from 0.1 milligrams to 175 grams, depending on the species and age/gender of the spider. The average spider weighs so tiny that it’s easier to state its weight in milligrams, ranging from 1 mg to 1 g. Larger spider species, such as tarantulas, mostly weigh between 30 g and 100 g, with some exceptions existing on both ends of the spectrum.

 Here are some examples of spider weights

  • Dwarf Spider: 1.4 mg
  • Ground Spider: 2 mg
  • Orb Weaver Spider: 3 mg
  • Tangle Web Spider: 3.6 mg
  • Sac Spider: 3.8 mg
  • Crab Spider: 6.1 mg
  • Wolf Spider: 8.1 mg
  • Running Crab Spider: 8.6 mg
  • Jumping Spider: 10.7 mg
  • Brown Recluse: 0.75 g
  • Black Widow: 1 g
  • Pink Toe Tarantula: 35 g
  • Goliath Birdeater: 175 g

It’s worth noting that the weight of a spider can vary depending on the source. For example, one source claims that the base weight of a spider without options is around 2,900 pounds, while another claim that a giant spider crab may weigh 40 to 50 pounds. However, it’s important to note that these sources are likely referring to different types of spiders, and the weight of a spider can vary greatly depending on the species. Finally, it’s worth noting that the claim that the Black Morning Spider is the deadliest in the world and weighs 500 pounds is false.

How Much Does A Spider Weigh?

A Light Touch: The Featherweights of the Spider World

The first port of call in our journey through the spider verse is the diminutive members of the arachnid family. Some of the tiniest spiders on record, such as the Patu Digua from Colombia, weigh a little 0.00025 grams. That’s roughly equivalent to 0.00000055 pounds! In this world, you could gather a whole company of these spiders, which would still weigh less than a single grain of rice.

The Middle Ground: Average Weights in the Arachnid Kingdom

Moving up the weight scale, we encounter the more average-sized spiders. A typical house spider, like the American House Spider (Parasteatoda tepidariorum), typically weighs about 0.02 grams or 0.00004 pounds. Even the more giant orb-weaving spiders, known for their intricate webs, usually weigh under 0.5 grams (0.001 pounds). These figures genuinely reinforce the lightweight nature of these eight-legged wonders.

Heavy Weights of the Spider World: Giant Tarantulas and Beyond

The famous tarantulas often come to mind when we think of giant spiders. The Goliath Birdeater (Theraphosa blondi), holding the title of the world’s largest spider by mass, can weigh up to 175 grams or 0.386 pounds. That’s heavier than a baseball! Although they do not represent the average spider, these giant arachnids prove how much a spider can weigh.

Why the Dramatic Differences in Spider Weights?

The variety in spider weights reflects their diverse lifestyles, habitats, and evolutionary strategies. Tiny spiders often inhabit unique niches, avoiding predation and competition by being incredibly lightweight and unnoticeable. On the other hand, giant spiders have evolved their considerable bulk to dominate their respective habitats, often preying on relatively large creatures.

How Much Does A Spider Weigh In Kg

At the shallow end of the scale, the minuscule Patu Digua, one of the world’s most miniature spiders, weighs in at a nearly imperceptible 0.00025 grams, or 0.00000025 kilograms. Even the more average-sized spiders, like the common house spider, tip the scales at a mere 0.02 grams, or 0.00002 kilograms. 

The Goliath Birdeater, the world’s giant spider by mass, now stands as a remarkable outlier. This heavyweight can weigh up to 175 grams, which converts to a solid 0.175 kilograms.

How Much Does A Spider Weigh In lbs

When we ponder on the question, ‘how much does a spider weigh in lbs,’ it’s hard not to be struck by the lightweight nature of these critters. The average house spider, for instance, weighs approximately 0.00004 lbs – about the weight of a grain of salt! Even the gargantuan Goliath Birdeater, the heaviest spider on the planet, tips the scale at merely 0.39 lbs, the weight equivalent of a medium-sized apple. The lightweight profile of spiders, it seems, underscores their incredibly adaptable and resilient nature.


Essentially, the question “how much does a spider weigh?” holds a universe of answers. We see spiders that weigh as little as a few micrograms, and at the other end of the scale, we see tarantulas that can rival small mammals in their weight. This fascinating diversity is just another testament to these captivating creatures’ adaptability and evolutionary process.

So, the next time you marvel at a spider, remember that each one, regardless of its size or weight, is an evolutionary marvel, perfectly adapted to its lifestyle and environment.

Why Do Spiders Wiggle Their bums?

How many kg does a spider weigh?

Spiders can weigh anywhere from 0.1 mg to 175 g, depending on the species and age/gender of the spider.

What is the heaviest spider ever?

The heaviest spider ever is the Goliath birdeater (Theraphosa blondi), which is the largest spider alive today by length and weight

What is the lightest spider ever?

the lightest spider ever is the Patu digua. It is a unique spider species found in Colombia and weighs just 0.0017 ounces (0.05 grams) 

How Much Does A Spider Weigh?

Spiders can weigh anywhere from 0.1 milligrams to 175 grams, depending on the species and age/gender of the spider.

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