How Much Does a Spider Weigh? (Common Spiders & Weights)

Have you ever wondered how much a spider weighs? You might be surprised to find out that these little creatures have a wide range of weights, thanks to the incredible diversity of spider species.

The weights can vary significantly from the tiny jumping spider to the massive tarantula, making this an interesting topic to explore.

As you read through this article, you’ll discover the incredible range of spider weights, shedding light on the fascinating world of these often misunderstood creatures. You’ll also learn the factors that influence the weight of a spider and why this information can be useful for scientists studying their behavior and biology.

So, without further ado, let’s delve into the world of spider weights and uncover the amazing details that make them such a fascinating subject.

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The weight of a spider varies greatly depending on its species and size. Some spiders can weigh as little as a few milligrams, while others can weigh up to several grams. For example, the Goliath birdeater spider, one of the largest spiders in the world, can weigh up to 6 ounces (170 grams), while the tiny Patu digua spider, which is one of the smallest spiders in the world, weighs only about 0.00002 ounces (0.5 milligrams).

Physical Attributes of Spiders

Size and Weight of Different Spider Species

jumping spider

Regarding spiders, you’ll find a vast range of sizes and weights. Here are a few examples of the different species and their respective sizes and weights:

  • Jumping spiders: These little creatures typically weigh about 13.5 mg and measure between 1mm to 25mm in body length.
  • Orb-weaver spiders: Commonly found in gardens, these spiders can weigh between 0.05 and 0.8 grams, with body lengths ranging from 2mm to 30mm.
  • Wolf spiders: These are known for their hunting skills and can weigh anywhere from 0.2 to 4 grams, with body lengths of 10mm to 50mm.
  • Tarantulas: As some of the largest spiders, they can weigh up to 85 grams and have body lengths of 25mm to 90mm.

While these are just a few examples, it’s important to note that there are thousands of spider species, each with unique size and weight attributes.

spider exoskeleton

When you consider a spider’s weight, it’s essential to understand how their anatomy plays a role. Here are a few key factors that contribute to a spider’s weight:

  • Exoskeleton: A spider’s hard outer shell is composed of chitin, which is both lightweight and strong, allowing them to maintain their structure while remaining agile.
  • Legs: Spiders have eight legs, which can be quite long and slender compared to their body. Since the legs consist predominantly of chitin, they don’t add significant weight to the spider.
  • Abdomen: The abdomen houses most of the spider’s internal organs, such as the digestive system, reproductive system, and silk glands. Depending on the spider’s diet and reproductive readiness, the weight of the abdomen can vary.
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How Much Does a Spider Weigh?

It’s astonishing how these tiny creatures have such an impact on our lives. You might wonder how much a spider weighs. The truth is that spiders vary greatly in weight, and it often depends on factors such as their species, age, and gender.

For example, some small spider species like the common house spider (Parasteatoda tepidariorum), weigh about 0.005 grams. On the other hand, larger species like the orb weaver (Araneidae) can weigh anywhere from 0.135 to 1.1 grams.

Spiders are incredibly diverse, boasting about 50,000 different species globally. To help better understand their varied weights, let’s consider a few more examples.

  • The minuscule crab spider (Thomisidae) weighs only 0.001 grams
  • The conspicuous black widow (Latrodectus) can weigh between 0.03 and 0.1 grams
  • The impressive tarantulas (Theraphosidae), like the Goliath bird-eater, can weigh up to 175 grams

Lastly, we cannot disregard sexual dimorphism – the difference in size and appearance between male and female spiders. Generally, females are larger and heavier than males, which is especially noticeable in species like tarantulas. Understanding these weight differences can be crucial if you’re interested in identifying or studying these remarkable creatures.

Factors Affecting a Spider’s Weight

When you’re curious about a spider’s weight, various factors come into play. In this section, we will explore two main aspects affecting a spider’s weight: diet, habits, and environmental factors.

Diet and Habit

web building spider

Understanding a spider’s diet and feeding habits can provide insights into their weight fluctuations. Here’s a brief explanation:

  • Predatory spiders: These spiders primarily feast on insects or other smaller spiders. Their weight may fluctuate depending on the availability and size of their prey. When food is abundant, they tend to weigh more.
  • Web-building spiders: Some spiders construct intricate webs to catch their prey. These spiders usually have stable weight, as their diet is relatively consistent.

Remember that a spider’s weight might change due to factors such as reproduction and molting. Female spiders may gain weight when gravid (carrying eggs), and spiders may also lose weight during the molting process – shedding their exoskeleton to grow.

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Environmental Factors

External conditions also have a significant impact on a spider’s weight. Let’s take a look at some common environmental factors:

  • Temperature: Like other ectothermic animals, spiders depend on environmental heat to regulate body temperature. Their metabolic rate increases in warmer conditions, causing them to eat more and potentially gain weight.
  • Humidity: Some spiders, especially those found in tropical regions, require high humidity levels to thrive. In drier environments, they may experience weight loss due to dehydration.
  • Seasonality: Many species of spiders exhibit seasonal weight changes. For example, spiders might be heavier during the summer when insect prey is more abundant than in the winter when food sources are scarce.

Methods to Measure a Spider’s Weight

One method that you can use to measure a spider’s weight involves using a digital scale. Choosing a scale with a high precision can be useful, as spider weights can be very small. Make sure the scale you use is capable of measuring at least up to 0.001 grams, and follow these steps:

  1. Place an empty container on the scale.
  2. Tare the scale, which means resetting it to zero with the container on it.
  3. Gently transfer the spider into the container.
  4. Record the weight displayed on the scale. This should be the spider’s weight alone, as the weight of the container was already accounted for when you tared the scale.

Another method for measuring a spider’s weight is using a suspension balance. This method can be slightly more difficult to set up, but it is very accurate when done correctly. Here’s how to go about it:

  1. Attach a soft string or thread to the spider using a tiny non-toxic adhesive.
  2. Secure the other end of the string to the balance.
  3. Allow the spider to arch upwards, suspending it in the air.
  4. Read the weight as displayed on the balance’s markings.

When working with spiders, remember to handle them gently and with care, as some species may be fragile or venomous. Use appropriate tools, such as soft brushes or tweezers, to move them as necessary, and release them back into their natural habitats after taking measurements.

Spider Names and Their Weights

You might wonder how much different spiders weigh as you read this article. Below, you will find a table that provides information about some common spider species and their respective weights:

Spider NameWeight
Common House Spider0.005g – 0.025g
Garden Orb Weaver0.05g – 0.80g
Black Widow0.5g – 1g
Tarantula (various species)28g – 85g
Camel Spider (Solifugae)4g – 56g
Goliath BirdeaterUpto 170g

Before diving into the details of each spider and their weights, it is essential to note that the weights provided are approximate and can vary depending on the spider’s age, sex, and overall health.

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The Common House Spider is a small, inconspicuous arachnid frequently found in and around human dwellings. Weighing between 0.005g and 0.025g, they are lightweight and easy to overlook.

Garden Orb Weavers are spiders known for their intricate webs, often stretching across gardens and outdoor spaces. Their weight ranges from 0.05g to 0.8g, making them larger than the Common House Spider but still relatively small compared to other spiders.

The infamous Black Widow spider is recognized for its venomous bite and distinct appearance. Weighing between 0.5g and 1g, these spiders pack a potent punch considering their small size.

black widow spider

Tarantulas, a group of large, hairy spiders, can vary greatly in size and weight among different species. In general, tarantulas weigh between 28g and 85g. Some popular pet tarantula species, such as the Mexican Red Knee, may weigh around 15g to 16g when fully grown.

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Finally, the Camel Spider or Solifugae is a group of large arachnids found in deserts worldwide. They typically weigh anywhere between 4g and 56g. Despite their intimidating appearance, they are not true spiders and do not possess venom.

Remember, the weights in the table are approximate, and individual spiders may weigh more or less than the stated ranges. Discovering how different spider species vary in size and weight is fascinating, offering a glimpse into the incredible diversity within the world of arachnids.

Frequently Asked Questions

How heavy is the largest spider?

The largest spider by weight is the Goliath Birdeater (Theraphosa blondi). These spiders can weigh up to 6 ounces (170 grams), which is about as heavy as a small apple. Their leg span is also one of the largest, reaching up to 11 inches (28 centimeters).

How light is the smallest spider?

The smallest known spider is the Patu digua. This tiny spider is found in Colombia and can weigh as little as 0.0014 ounces (0.04 milligrams). To put this into perspective, it’s lighter than a single grain of salt.

What is the weight of an average house spider?

An average house spider weighs around 0.03 to 0.05 ounces (1 to 1.5 grams), depending on the species and their stage of development. As a comparison, this weight is equivalent to a paper clip or a piece of popcorn.

What’s the mass of a wolf spider?

Wolf spiders can vary in size and weight, but an average adult wolf spider weighs about 0.07 to 0.14 ounces (0.2 to 4 grams). These spiders are commonly found in grasslands and wooded areas and may even come into your home.

What is the weight of a tarantula?

Tarantulas, known for their fuzzy and large appearance, can weigh between 1 to 2.9 ounces (28 to 85 grams) depending on the species. Some of the heaviest tarantulas are the Goliath Birdeater, mentioned earlier, and the salmon-pink bird-eating Tarantula (Lasiodora parahybana).

About Kevin Jones

My name is Kevin Jones, and I'm the proud founder of this website. I'm a self-professed measurement enthusiast, and I've been passionate about measuring things for as long as I can remember. On this website, you'll find information on all aspects of dimensions, including measurements and weight of stuff.