🏠 Home & DIY

Aquarium Volume Calculator

Calculate the water volume of a rectangular fish tank.

in
in
in

Results

US gallons
29.92
Liters
113.27
Water weight
250 lb

📊 Aquarium Volume Calculator chart

How the us gallons changes as the height varies. The orange dot marks your current value.

What is the Aquarium Volume Calculator?

Calculate the water volume of a rectangular fish tank. Order the right amount the first time. These construction and DIY calculators estimate materials for common home projects and include sensible waste allowances.

Aquarium Volume Calculator – free online home & diy tool illustration
Aquarium Volume Calculator — free, exact and private.

How to use the Aquarium Volume Calculator

  1. Enter your length, your width, your height.
  2. Results update automatically as you type; you can also press Calculate.
  3. Read the output: us gallons, liters, water weight.
  4. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

Gallons = L × W × H (in) ÷ 231

Worked example

With length = 36 in, width = 12 in, height = 16 in, the Aquarium Volume Calculator returns us gallons: 29.92; liters: 113.27; water weight: 250 lb.

Tips for better results

  • Add 5–15% for waste, cuts and breakage depending on the material.
  • Measure twice and round up when buying — returns are easier than second trips.
  • Coverage figures vary by product, so check the label or spec sheet.

⚠️ Material estimates are approximate. Follow local building codes and manufacturer instructions.

Frequently asked questions

What does the Aquarium Volume Calculator do?

Calculate the water volume of a rectangular fish tank.

How is it calculated?

The Aquarium Volume Calculator uses this method: Gallons = L × W × H (in) ÷ 231.

Can you show an example?

With length = 36 in, width = 12 in, height = 16 in, the Aquarium Volume Calculator returns us gallons: 29.92; liters: 113.27; water weight: 250 lb.

Is the Aquarium Volume Calculator accurate?

It uses standard published formulas and is tested against known values, but results are estimates for guidance. Material estimates are approximate. Follow local building codes and manufacturer instructions.

Is this tool free and private?

Yes — the Aquarium Volume Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

Related tools

Pool Volume CalculatorCalculate how many gallons a rectangular pool holds.Concrete CalculatorCalculate the concrete needed for a slab in cubic yards, cubic meters and premix bags.Paint CalculatorEstimate how many gallons of paint you need for a room.Tile CalculatorCalculate how many tiles you need for a floor or wall, with waste allowance.Flooring CalculatorEstimate square footage and boxes of flooring (laminate, vinyl, hardwood).Square Footage CalculatorCalculate square feet of a room or space, plus square meters and cost.Mulch CalculatorCalculate how much mulch, soil or compost you need in cubic yards and bags.Gravel CalculatorEstimate gravel volume and weight in tons for driveways and paths.

📬 Get new tools first — free

Join Taurang to hear about new calculators, converters and features. No spam; unsubscribe anytime.

Create free account