---
title: "Giant Pacific octopus vs Japanese spider crab — size, weight a"
description: "Giant Pacific octopus and Japanese spider crab are near enough identical on weight. Compared on 3 measured properties, with the full range and a source for each."
url: https://atoneplace.net/vs/giant-pacific-octopus-vs-japanese-spider-crab/
site: "At One Place"
---

# Giant Pacific octopus vs Japanese spider crab

**Giant Pacific octopus vs Japanese spider crab: Near enough equal on weight**

Giant Pacific octopus and Japanese spider crab are near enough identical on weight.

A giant Pacific octopus and a Japanese spider crab can be compared on 3 measures. The figures below are typical adult or full-size values, with the larger of the two in bold.

## Side by side

*Larger value in bold. Ranges reflect genuine variation, not uncertainty.*

|  | Giant Pacific octopus | Japanese spider crab |
| --- | --- | --- |
| Weight | 10–71 kg | 10–19 kg |
| Width | 3–6 m | 3–3.8 m |
| Typical lifespan | 3–5 yr | 50–100 yr |

## What the numbers say

- Giant Pacific octopus and Japanese spider crab are near enough identical on weight.
- Giant Pacific octopus is somewhat greater than Japanese spider crab on width — about 1.2×.
- Japanese spider crab is 15× giant Pacific octopus on typical lifespan.

*Weight compared.*

- Japanese spider crab: 10–19 kg
- Giant Pacific octopus: 10–71 kg

## Giant Pacific octopus

The largest octopus species, with three hearts, blue blood and about 2,000 suckers.

## Japanese spider crab

The arthropod with the greatest leg span of any living species.

> This is a comparison of published measurements, nothing more. It describes how two things differ on measures that have been recorded; it does not predict how they would fare against each other in any situation.

## Common questions

### Which is bigger, giant Pacific octopus or Japanese spider crab?

Giant Pacific octopus and Japanese spider crab are near enough identical on weight. Both figures are typical values; the full range for each is in the table above.

### How do giant Pacific octopuses and Japanese spider crabs compare on width?

Giant Pacific octopus: 3–6 m. Japanese spider crab: 3–3.8 m. Giant Pacific octopus is somewhat greater than Japanese spider crab on width — about 1.2×.

### How do giant Pacific octopuses and Japanese spider crabs compare on typical lifespan?

Giant Pacific octopus: 3–5 yr. Japanese spider crab: 50–100 yr. Japanese spider crab is 15× giant Pacific octopus on typical lifespan.

## Related pages

- [Giant Pacific octopus vs kayak](https://atoneplace.net/vs/giant-pacific-octopus-vs-kayak/)

## Sources

- National Oceanic and Atmospheric Administration — NOAA (https://www.noaa.gov/) [Public domain (US Government)]