Aquarium calculators for practical tank plans

Work out the water, substrate and equipment for your next freshwater tank. Every answer shows its assumptions.

Eight tools. All the working.

• Tank volume

  Dimensions to US gallons and litres.

• Gravel & substrate

  Footprint, depth and bags to buy.

• Heater wattage

  Room temperature to heater power.

• Filter flow

  Turnover targets for different loads.

• Stocking guide

  Adult size, footprint and cautious ideas.

• Water changes

  Percentages to gallons and buckets.

• Dechlorinator dose

  Prime or your own label ratio.

• Filled weight

  Water, glass and substrate together.

Choose your tank

Rounded planning dimensions, not guaranteed outside measurements. Confirm the brand and measure before ordering equipment.

• 2.5 gallon12 × 6 × 8 in
• 5 gallon16 × 8 × 10 in
• 5.5 gallon16 × 8 × 10 in
• 10 gallon20 × 10 × 12 in
• 13 gallon widescreen24 × 8 × 19 in
• 15 gallon24 × 12 × 12 in
• 15 gallon column13.75 × 13.62 × 25 in
• 20 gallon high24 × 12 × 16 in
• 20 gallon long30 × 12 × 12 in
• 20 gallon extra high20 × 10 × 24 in
• 25 gallon24 × 12 × 20 in
• 29 gallon30 × 12 × 18 in
• 30 gallon36 × 12 × 16 in
• 33 gallon long48 × 13 × 13 in
• 37 gallon30 × 12 × 22 in
• 38 gallon36 × 12 × 20 in
• 40 gallon breeder36 × 18 × 16 in
• 40 gallon long48 × 12 × 16 in
• 45 gallon36 × 12 × 24 in
• 50 gallon36 × 18 × 19 in
• 55 gallon48 × 13 × 21 in
• 60 gallon breeder48 × 18 × 16 in
• 65 gallon36 × 18 × 24 in
• 75 gallon48 × 18 × 21 in
• 90 gallon48 × 18 × 24 in
• 110 gallon48 × 18 × 30 in
• 120 gallon48 × 24 × 24 in
• 125 gallon72 × 18 × 21 in