Everyday tool
Use tank dimensions, water level, substrate, and decorations to estimate water volume, setup weight, and water-change amounts.
Displacement is estimated; inside measurements give a closer starting point
The calculator estimates solid displacement by substrate type, then deducts the decoration percentage. Enter rocks, wood, internal filters, and similar items as one combined percentage.
Estimated result
Estimated setup weight includes water, estimated substrate, and your entered empty-tank/decor/equipment weight. Confirm the stand and floor load separately for large tanks.
Round up to a common heater size; use two smaller heaters for large tanks.
Nominal flow before media, hose, and head-height losses.
2.6 US gal
Use a schedule suitable for your livestock and test results.
The figures below are assumptions used by this tool, not measured product specifications. Display values are rounded; calculations retain intermediate precision.
Setup weight = water + estimated substrate + the entered tank/decor/equipment weight. Decor percentage does not add rock or wood weight automatically. The stand and floor's load capacity are not assessed.
Water volume and equipment
Enter length, width, tank height, and actual water height. Gross capacity and water-level volume are different figures.
Add substrate type/depth and a decoration percentage. Rock or wood weight is not added by the percentage; include it in the separate weight field.
Water changes and equipment figures use estimated actual water volume. Setup weight adds water, estimated substrate, and your entered equipment weight.
A worked example
The unrounded volume is 48.735 L: soil uses a 0.5 displacement factor, then decor removes 5% of the remaining volume.