Aquarium Volume Calculator

• Aquarium volume calculator for rectangular, cylindrical, and hexagonal tanks
• Real-time conversion between liters, US gallons, and UK gallons, with recommended values for actual water volume, water weight, substrate weight, filter flow, and heater wattage

1. Open the tool page — no installation required
2. Pick a tank shape (rectangular, cylindrical, or hexagonal) and enter the dimensions such as length, width, and height in centimeters; you can also set water level, water type, and substrate
3. Results update instantly as you change inputs. Use “Example Data” to auto-fill a sample, or “Reset All” to clear everything

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device

Free online aquarium volume calculator supporting rectangular, cylindrical, hexagonal, and custom shaped tanks. Real-time conversion between liters, US gallons, and UK gallons, with water weight, substrate, filter flow, and heater recommendations.

Open the tool page — no installation required Pick a tank shape (rectangular, cylindrical, or hexagonal) and enter the dimensions such as length, width, and height in centimeters; you can also set water level, water type, and substrate Results update instantly as you change inputs. Use “Example Data” to auto-fill a sample, or “Reset All” to clear everything

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device

Yes, Aquarium Volume Calculator is completely free. No download or installation required — it runs right in your browser.