Aquarium Volume Calculator
Tank gallons, liters, water weight, and stocking.
Practical numbers
Stand strength matters. A 55-gallon tank weighs about 460 lb when full. Most stock furniture isn't rated for that. The "1 inch of fish per gallon" rule is a rough cap for community tanks; bigger or aggressive species need more space than that. Substrate, rocks, and rim glass cut usable volume by 5–15%.
About
Enter tank length, width, and height. Get the volume in US gallons and liters, plus the realistic 'filled' volume after substrate and decor, water weight, and a rough fish-stocking estimate. Useful before buying a stand.
How to use
- Enter L × W × H.
- Pick units.
- Read volume and weight.
FAQ
Is the 'inch of fish per gallon' rule reliable?+
Only as a rough cap for community tanks. Bigger or aggressive species need more space than that suggests, and bioload from a single 8-inch fish is more than from eight 1-inch fish.
Why does the stand matter?+
A 55-gallon tank weighs about 460 lb when full. Most stock furniture isn't rated for that. Buy or build a stand made for an aquarium.