The length of the average British House Spider (non-poisonous) is around 10-50mm (1-5cm) but larger and smaller specimens have been found.
The average size of an Australian wolf spider is around 1 to 2 inches in body length.
The Theridon Grallator, or Hawaiian Happyface Spider, averages approximately 5mm in length. It weighs on average less than 1 gram.
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The White Crab Spider can grow to a size of 10mm in length.
The smallest length known today is 2.3cm
The smallest spiders in the world are the Samoan Moss spider which are known to grow at a length of 0.0017 inchesAnapistula Caecula, the smallest spider
1/2 in. long
14.6 feet
An average couch is about average length
Only some species are smaller than average monkeys. Many are significantly larger, especially in the length of their long arms, legs, and tails.
The average size of a spider is about 4 centimeters depending on the species