Aquarium Substrate Calculator
Calculate how much substrate you need for your aquarium.
Substrate Calculator
Calculate the amount of substrate needed for your aquarium
Formula
Weight = Length × Width × Depth × DensityHow to Use
- 1Enter tank dimensions — Input the length and width of your tank in inches or centimeters.
- 2Choose desired depth — Select your target substrate depth — typically 1-3 inches for most setups.
- 3Select substrate type — Choose between gravel, sand, or planted tank soil for accurate weight calculation.
- 4Get your amounts — See how many pounds or kilograms of substrate to purchase.
Frequently Asked Questions
How deep should aquarium substrate be?
1-2 inches for fish-only tanks, 2-3 inches for planted tanks. Slope it from back (deeper) to front (shallower) for a natural look.
How many pounds of gravel per gallon?
Approximately 1-1.5 pounds per gallon for a 2-inch layer. Exact amounts vary by tank dimensions.
Can I mix gravel and sand?
You can, but sand tends to settle below gravel over time. Use a mesh divider or keep them in separate zones.
Do I need special substrate for live plants?
Yes. Planted tanks benefit from nutrient-rich substrate like aquasoil, though root tabs can supplement inert substrate.