Aquarium volume calculator
Calculate water in liters and US gallons, then estimate substrate liters from the front and back depths.
- Standard tanks or your own dimensions
- Flat or sloped substrate bed
- Keep the same tank for a stocking check
Free aquarium calculators
Check how much water and substrate your tank needs, or review a freshwater fish selection. Get a useful answer first, then bring the same setup into your scape.
Aquarium stocking calculator
Estimate load by adult size and animal count. Review tank size, group size, temperature and known conflicts separately.
- Freshwater fish, shrimp and snails
- Editable example to explore
- Species checks alongside the estimate
Choose the right starting point
If you are choosing a tank or buying substrate, start with volume. If you already have an animal list, start with stocking and enter the tank you intend to use. Both tools share the same dimensions and substrate depths when you move between them.
Keep your choices in a tank plan
Each result can open a new tank in Scapesome. Carry over your dimensions, substrate depths and species counts, then place rocks and plants by hand. Your existing tanks stay as they are.
Planning is free. Images and AI analysis are optional paid actions; the calculators do not trigger them. See what is included in each plan.
Know what an estimate can tell you
Volume assumes a rectangular tank and a simple substrate slope. Stocking is a freshwater planning heuristic; it cannot verify filtration, cycling or actual water conditions. Review the explanation on each tool and the tank and species library for the details behind your choices.