Aquarium Soil Calculator

Plan how many bags of aquarium soil, sand or substrate you should buy for your tank layout.

  • Bag recommendation
  • Front-to-back slope
  • 3D layout preview
Tank Size & Soil Layout
Enter your tank footprint, choose your soil depth and bag size, then get a clear purchase recommendation.
Auto-calc Purchase planner
Quick layout style

Optional. Soil amount is calculated from length, width and soil depth.

Optional. Used only to estimate total cost.

Substrate Layout Preview
Updates as you type • Drag to rotate
Your Soil Estimate
You should buy: bags
Estimated need: –
Estimated cost: –
Layout: SLOPED
Needed
Buy
Leftover
Weight
Purchase recommendation

Enter your tank dimensions to calculate how many bags you should buy.

    Show calculation details
    Tank Footprint
    Average Soil Depth
    Raw Volume
    With Buffer
    Substrate Type
    Density Used
    Planning Buffer
    Settling Allowance
    Planning tip Tip: Do not round down. It is usually better to have a small amount of soil left over than to run short during setup.
    Result tools
    Save your soil estimate
    Copy the bag recommendation, export it as an image or reset the calculator.

    FAQ

    What does the Aquarium Soil Calculator estimate?

    The calculator estimates how much aquarium soil you need based on your tank footprint and desired substrate depth. If your layout uses a slope, it calculates the soil volume from the lower front height to the higher back height.

    How deep should aquarium soil be?

    For most planted aquariums, a practical soil depth is around 4–6 cm in the front and 6–10 cm in the back. Carpeting plants usually need enough depth for stable rooting, while strong background plants benefit from a deeper rear section.

    Why does the calculator include a sloped substrate option?

    A sloped substrate creates more depth and perspective in an aquascape. Many layouts use less soil in the front and more soil in the back to make the aquarium look deeper and to support larger background plants.

    How many liters of soil do I need for my aquarium?

    The required amount depends on the tank length, width, and substrate height. A shallow layout may only need a few liters, while a heavily planted aquascape with a strong back slope can require significantly more soil.

    Should I buy exactly the calculated amount?

    It is usually better to buy slightly more than the exact calculated amount. Soil can settle over time, hardscape can change the layout volume, and extra soil gives you more flexibility when shaping slopes or planting dense areas.

    Can I use this calculator for sand or gravel too?

    Yes, the volume calculation works for any substrate type. However, aquarium soil, sand, and gravel can differ in weight, grain size, and settling behavior, so the result should be treated as a practical estimate rather than an exact weight calculation.

    Related lessons: Aquarium Soil Guide Aquarium Sand Aquarium Carpeting Plants Aquarium Plant Care Tools

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