Aquarium volume & weight - Tools & Calculators
Aquarium volume & weight
Calculate the water volume and the total weight.
How do I calculate the volume and weight of my aquarium?
Why is knowing your aquarium volume important?
Accurate volume calculation is fundamental for aquarium keeping. You need to know your exact water volume for proper medication dosing, fertilizer application, stocking calculations, and equipment sizing. The net volume (actual water) is always less than gross volume due to substrate, hardscape, and equipment displacement.
Volume calculation formulas
Cylinder: Volume (L) = π × (Diameter ÷ 2)² × Height ÷ 1000
Gross vs. net volume
The calculated (gross) volume is the theoretical maximum. Your actual (net) water volume is typically 10–20%% less due to:
- Substrate layer (5–10%% displacement depending on depth)
- Rocks and driftwood (varies widely)
- Internal filters, heaters, decorations
- Not filling to the very top (safety margin)
Understanding aquarium weight
Water weighs approximately 1 kg per liter. A filled aquarium is surprisingly heavy – a small 60 L tank already weighs about 70–80 kg including glass, substrate, and hardscape. Always ensure your stand and floor can support the total weight!
Common aquarium sizes and weights
| Dimensions (L×W×H) | Gross volume | Approx. total weight |
|---|---|---|
| 30×30×35 cm | ~32 L | ~40 kg |
| 60×30×36 cm | ~65 L | ~80 kg |
| 80×35×40 cm | ~112 L | ~140 kg |
| 100×40×50 cm | ~200 L | ~250 kg |
| 120×50×50 cm | ~300 L | ~380 kg |
| 150×50×60 cm | ~450 L | ~560 kg |
Weights include glass, substrate (~5 cm), and hardscape. Actual weights vary by glass thickness and decoration.
Tips for accurate volume calculation
- Measure inside dimensions for accuracy – glass thickness reduces internal volume
- For medication, use a conservative (lower) estimate to avoid overdosing
- The most accurate method: fill with a measured container and count
- Check floor and stand weight capacity before setting up large tanks