Aquarium Substrate Calculator
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Calculate how much aquarium substrate you need by tank size, depth, substrate type, and bag size.

Before you add substrate

- Decide whether the layout is flat, sloped, or planted before estimating depth.
- Check whether the substrate should be rinsed before use.
- Confirm the bag weight and density for the exact brand.
- Leave enough free space for hardscape, filters, and livestock needs.

When this estimate may be wrong

- Sloped aquascapes and deep planted areas can use more substrate than a flat average depth.
- Rocks, wood, and decor displace substrate and water volume.
- Some livestock need specific substrate types or depths that a volume calculator cannot decide.

Before buying substrate

Check the needs of your livestock and plants, then confirm bag weights and substrate density from the brand you plan to use.

Disclaimer

Substrate depth depends on livestock, plants, and tank design. Check species-specific requirements.