When to use
- Planning tank purchases for a new aquatic facility
- Calculating water volume for dosing or treatment concentration
- Checking stocking density compliance with IACUC guidelines
- Estimating water weight for structural load calculations
ToolsConductScience tool
Aquatic Facility ScienceFree in-browser calculator
Tank Volume Calculator.
Calculate water volume for laboratory aquarium tanks from dimensions. Includes presets for common zebrafish facility tanks and a stocking density helper.
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Validated2026-04-06
CitableMethods and citation included
Calculator
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Load example tank volume data to see the full workflow
Tank Dimensions
Gravel, sand, or marbles — leave 0 for bare-bottom tanks
Enter to calculate stocking density
Do not use for
- For irregularly shaped tanks — measure water volume directly by filling and measuring
- As a substitute for flow-rate calculations in recirculating systems
- For saltwater weight estimation — density varies with salinity
Measure to the overflow, not the rim
In rack-mounted systems, water level is set by the overflow notch, not the tank rim. The actual water volume may be 10–20% less than the full tank capacity.
Account for equipment displacement
Heaters, filters, air stones, and hides all displace water. For precise dosing calculations, subtract estimated equipment volume or measure actual fill volume.
Stocking density is a guideline, not a law
Optimal density depends on species, age, water quality management, and experimental needs. Higher densities are acceptable with excellent filtration; lower densities may be needed for behavioral studies.
Cylindrical tanks — diameter, not radius
When measuring cylindrical tanks, enter the full diameter. The calculator divides by 2 internally. A common error is entering the radius, which gives a volume 4× too small.
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Method
Rectangular volume: L W (H − substrate). Cylindrical volume: (D/2)² (H − substrate). Conversions: 1 L = 1000 mL = 0.2642 gal. Water weight: 1 kg/L (freshwater). Stocking density thresholds: 5–10 fish/L recommended, >10 warning, >15 overcrowded.
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Validated
Last validated 2026-04-06. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.
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How to cite
How to Cite
ConductScience Tank Volume Calculator (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/tank-volume-calculator
Westerfield M. The Zebrafish Book: A Guide for the Laboratory Use of Zebrafish. University of Oregon Press. 2000.
Reed B, Jennings M. Guidance on the Housing and Care of Zebrafish. RSPCA. 2011.
Laboratory Tank Design Considerations
Zebrafish facility tanks differ from ornamental aquariums in several key ways:
- Standardized dimensions: Rack-mounted tanks (1.8 L, 3 L) are designed to fit specific rack systems with integrated water flow
- Bare-bottom design: Most research tanks omit substrate for easier cleaning and embryo collection
- Flow-through or recirculating: Water is continuously exchanged, so static volume is less critical than turnover rate
- Overflow height: The actual water level is set by the overflow, not the tank rim — measure to the overflow notch for accurate volume
Stocking Density Guidelines
Appropriate stocking density depends on fish age, system type, and experimental requirements:
- Larvae (0–14 dpf): Up to 50 per dish/tank in small volumes during early development
- Juveniles (14–90 dpf): 10–20 fish/L with adequate filtration
- Adults (>90 dpf): 5–10 fish/L depending on institutional IACUC protocol (Aleström et al. 2020 recommends 4–10/L)
- Breeding pairs: Isolated in 1 L mating tanks (1 male + 1–2 females)
Overcrowding increases cortisol, reduces growth rate, and can alter behavior — all of which confound research outcomes.
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