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Typical Tank Dimensions (Part 4)

When considering what tank to get you will definitely need to know how big your tank typically is. Here is a listing of common tanks and their various sizes.

Category
Knowledge Base
Published
Jul 29, 2026

Quick answer

This article will have sizes of typical tanks up to 180 gallons. Each will be posted according to long size, tall size, and the typical low boy size. Additionally the most common types of breeder tanks will be marked.

Notation:

All numbers are in inches.

  • L = Length
  • W = Width
  • H = Height

1.) Rectangular (long tanks)

  • 5 gallon : 16 L x 8 W x 10 H
  • 10 gallon: 20 L x 10 W x 12 H
  • 20 gallon: 30.25 L x 12.5 x 12.75 H
  • 30 gallon: 36 L x 12 W x 16 H
  • 40 gallon: 48 L x 12 W x 16 H
  • 55 gallon: 48 L x 13 W x 21 H
  • 60 gallon (Breeder): 48.5 L x 18.5 W x 16 H
  • 75 gallon: 48 L x 18 W x 21 H
  • 90 gallon: 48 L x 18 W x 24 H
  • 125 gallon: 72 L x 18 W x 23 H
  • 180 gallon: 72 L x 24 W x 25 H

2.) High Tanks:

  • 20 gallon: 24.25 L x 12.5 W x 16.75 H
  • 29 gallon: 30.25 L x 12.5 W x 18.75 H
  • 38 gallon: 36 L x 12 W x 20 H
  • 40 gallon (Breeder): 36 L x 18 W x 16 H
  • 60 gallon: 48.5 L x 12.75 W x 24.75 H

3.) Low boy tanks:

  • 28 gallon: 36 L x 18 W x 10 H
  • 50 gallon: 48 L x 24 W x 10 H