How many feet long is the biggest spider ever?

There's no single answer to this question, because it depends on how you define "biggest."

Here are a few different ways to consider size, and the relevant record-holders:

* Leg span: The giant huntsman spider (Heteropoda maxima) holds the record for the largest leg span, measuring up to 12 inches (1 foot).

* Body length: The goliath birdeater (Theraphosa blondi) is the heaviest spider, and has a body length of up to 5 inches. However, its leg span can reach up to 11 inches.

* Weight: The goliath birdeater is also the heaviest spider, reaching weights up to 6 ounces.

So, depending on how you measure "biggest," the goliath birdeater or the giant huntsman spider could be considered the largest.

It's important to note that these are just estimates, and there may be even larger spiders out there that haven't been discovered yet.