Substrate Calculator
Estimate aquarium substrate volume, weight and bag count from tank footprint, front and back depth, material density and bag size. Review the assumptions below and continue with the related guides and calculators linked on this page.
Fill in the required fields to see your result.
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Use the primary result together with the supporting outputs. Related Calciro resources: [Aquarium Volume Calculator](/aquarium-volume-calculator), [Volume Calculator](/volume-calculator), [Weight Converter](/weight-converter), [How to Use the Volume Calculator](/guides/how-to-use-volume-calculator).
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How to Use This Calculator
Enter the requested values using the units shown. Keep all values consistent and review every assumption before interpreting the result.
Formula & Methodology
The calculator applies the displayed formulas directly to the entered values. Supporting outputs expose intermediate calculations rather than hiding them.
Worked example
A 90 × 45 cm tank with an average 5 cm bed uses about 20.3 liters before adding a buying allowance.
Bulk density varies by product, moisture and compaction. Hardscape displaces substrate, steep slopes settle and species-specific depth or material requirements must be considered separately.
Aquarium planning estimate only. Verify product labels and livestock requirements before purchasing or installing substrate.
Related Guides
Frequently Asked Questions
- What does the Substrate Calculator calculate?
- Estimate aquarium substrate volume, weight and bag count from tank footprint, front and back depth, material density and bag size.
- Can I change the assumptions?
- Yes. Enter values that match your situation and review the displayed assumptions and limitations before using the result.
- Is the result guaranteed?
- No. The result is an estimate and should be independently verified before any medical, legal, financial, academic, engineering or purchasing decision.
Last updated 7/22/2026