Measure twice. Choose once.
Aquarium Dimensions & Standard Fish Tank Sizes
Check a tank’s real footprint, capacity and source before you commit to a stand, lid, light or filter.
Example footprint
Standard 55 gallon
Length × width × height48.25 × 12.75 × 21 in
Before you buy
The numbers that prevent expensive surprises
A nominal gallon label is only a starting point. Use the model page to check the space, equipment clearance and evidence behind a tank listing.
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Confirm the footprint
Compare length, width and height against your stand, shelf, doorway and the room around the tank.
Compare models →×
Estimate water volume
Calculate geometric volume in US gallons and litres, then leave room for substrate, décor and equipment.
Run the calculation →⌕
Match an unknown tank
Use measured dimensions to find close catalog matches when a label or model number is missing.
Find a match →429catalog models
25manufacturers
1source shown for every model
Standard references
Standard aquarium dimensions
Use a standard size as a starting point, then open the linked models for exact manufacturer dimensions.