How much water does your aquarium hold? How much will your aquarium weigh when it is full?

Use our Aquarium Volume and Weight Calculator to find out how much your complete tank will hold and weigh. Can your floor support a heavy aquarium?

  1. U.S. Units
  2. Metric Units

Quick Aquarium Weight Calculation (U.S. units)

Enter U.S. gallons to get quick aquarium weight estimate

Gallons your tank holds:


Your tank weighs approximately lbs. when full.

The Quick Calculation does not account for substrate, decorations, the weight of the empty aquarium, stand, etc. For a more precise estimate, use the Detailed Calculation.


Detailed Aquarium Weight Calculation (U.S. Units)

Please enter U.S. units to approximate
the weight and volume of your filled aquarium

Length inches (required)

Width inches (required)

Depth of Water inches (required)

Optional: Depth of Substrate inches
[enter "0" (zero) if unknown]

Optional: Weight of Empty Aquarium (and other elements, such as decorations or stands, if desired) lbs.
(enter "0" if unknown)


Your aquarium weighs about lbs.

Your aquarium would hold about gallons with no substrate or decorations.

No result? Make sure you entered numbers into all fields. Calculator will not work if any fields are blank or contain letters.

Aquarium Volume and Weight Calculator (Metric Units)

If completely full, the weight of the water alone in your aquarium in kilograms (kg) is equal to the number of litres (L) it contains. However, this does not account for the weight of the substrate, decorations, the empty tank, or how full the tank is filled. Use the following aquarium weight calculator to more closely approximate the total weight of your aquarium.

Please enter metric units to approximate the weight and volume of your filled aquarium

Length cm (required)

Width cm (required)

Depth of Water cm (required)

Optional: Depth of Substrate cm (enter "0" if unknown)

Optional: Weight of Empty Aquarium (and other elements, such as decorations or stands, if desired) kg (enter "0" if unknown)


Your aquarium weighs about kilograms (kg)

Your aquarium would hold about litres (L) with no substrate or decorations.

No result? Make sure you entered a number in all fields. Calculator will not work if any fields are blank or contain letters.

What the Aquarium Weight Results Mean

These results are an approximation. Actual volume and weight may vary, depending on how full the tank, type of substrate, filter, decorations, etc.

For the weight of the substrate, we are using the general approximation that wet gravel or sand substrate weighs about twice as much as the equivalent volume of water. This is based on U.S. and U.K. standardized weight-to-volume ratios of common materials.

!Critical Fishkeeping Equipment

Fish are not set-up-and-forget pets. Consider these items we personally use and recommend that make the setting up and maintenance of an aquarium easier for you and healthier for the fish.

Aqueon Water Changer and Gravel Cleaner
Gravel Cleaner and Water Changer

More Info

Water changes of 10-20% should be done weekly. Vacuum, empty and fill your tank quickly from any faucet with this gadget. No more buckets! Don't forget dechlorinator and a thermometer, too.

Water Parameter Test Kit for Aquarium Fish Tank
Water Test Kit.
Fresh test kits are critical for a new tank. I lost some new fish in a quarantine tank when I missed an ammonia spike due to outdated testing supplies. Liquid kits are far superior to test strips.

MarineLand BioWheel Tank Filter
Bio-Wheel Filters
. The bio-wheel section maintains beneficial bacteria even when filter media is replaced. My Marineland Bio-Wheel has been quiet and trouble-free. TIP: Don't replace the filter media until it is about to fall apart. When clogged, rinse it in water removed from the tank. Over-cleaning can cause an ammonia spike.