An aquarium calculator helps you figure out liters or gallons from tank dimensions

https://aquarium-sizexvbk481.nexorafield.com/posts/10-things-you-learned-in-kindergarden-to-help-you-get-started-with-fish-tank-litre-calculator

An aquarium calculator helps you determine liters or gallons from tank measurements. It also approximates water modifications and filtering requires to keep your aquarium stable.