Aquarium Volume Calculator (Fish Tank Gallons)
Aquarium volume calculator: gallons or liters of a fish tank from length, width and water height, with the weight of the water.
V = L · W · H
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
Volume = length × width × water height. 1 liter of water weighs about 1 kg (8.34 lb per US gallon), so check your stand.
Formula
V = L · W · H
| Symbol | Quantity | Units |
|---|---|---|
| L | Length | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| W | Width (depth) | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| H | Water height | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| V | Water volume | L, mL, µL, m³, dm³, cm³, gal, gal (UK), qt, pt, cup, fl oz, ft³, yd³, in³ |
Worked example
Given: L = 31.4961 in · W = 13.7795 in · H = 15.748 in
V = L W H
Result: V = 29.5873 gal
Water volume for different values of Length
| L · Length | V · Water volume |
|---|---|
| 15.75 in | 14.794 gal |
| 23.62 in | 22.19 gal |
| 28.35 in | 26.629 gal |
| 31.5 in | 29.587 gal |
| 34.65 in | 32.546 gal |
| 39.37 in | 36.984 gal |
| 47.24 in | 44.381 gal |
| 62.99 in | 59.175 gal |
Other values as in the worked example.
Frequently asked questions
48 × 13 × 21 in tank?
About 56.7 gallons (215 L).
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