Activated Charcoal Amount Calculator

Measure activated charcoal for healthier soil and roots. Choose mixes, layers, or compost deodorizing needs. Get grams, cups, and cost estimates instantly today here.

Calculator Inputs

Pick a method, enter measurements, then calculate. Fields are arranged for 3 columns on large screens, 2 on smaller, and 1 on mobile.
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Typical loose activated charcoal is 200–600 g/L. Default 450 g/L.
Adds a buffer for dusty loss and measuring error.
Enter your potting mix, terrarium substrate, or soil blend volume.
Common: 2–5%. Higher rates can dry mixes.
When to mix
Use charcoal when you want mild odor control and faster drainage. For seedlings, keep rates closer to 2–3%.
Good starting point: 1 cm for small containers.
Layer placement
Place charcoal above a coarse drainage layer (optional), then cover with mesh or sphagnum before adding soil to reduce mixing.
Use your fresh compost batch or bin contents.
Suggested range: 5–10 g/kg for odor control.
Mixing
Sprinkle in thin layers, then turn the pile. Keep airflow and moisture balanced for best results.
Cost output follows your selected currency symbol.
Result appears above the form after submission.

Example Data Table

These examples show typical scenarios. Use your own measurements for accuracy.
Scenario Inputs Assumptions Estimated charcoal
Potting mix amendment 20 L medium, 3% rate Density 450 g/L, 5% waste 0.630 L ≈ 298 g
Terrarium filter layer 30×20 cm base, 1.0 cm thick Density 450 g/L, 5% waste 0.630 L ≈ 298 g
Compost odor control 10 kg compost, 7 g/kg Density 450 g/L, 5% waste 74 g ≈ 0.164 L
Tip: If your charcoal is very chunky or very fine, adjust density upward or downward to match how it packs.

Formula Used

Mix mode (by volume)
Charcoal_L = Medium_L × (Rate% ÷ 100)
Charcoal_g = Charcoal_L × Density(g/L)
Layer mode (by thickness)
Area_cm2 = L_cm × W_cm
Charcoal_L = (Area_cm2 × T_cm) ÷ 1000
Compost mode (by weight)
Charcoal_g = Compost_kg × Rate(g/kg)
Charcoal_L = Charcoal_g ÷ Density(g/L)
Waste buffer: final amount = base amount × (1 + waste%/100).

How to Use This Calculator

  1. Select an application mode that matches your gardening task.
  2. Enter your measurements and keep units consistent.
  3. Set the bulk density if your charcoal packs differently.
  4. Add a waste buffer if you expect spillage or dust loss.
  5. Optional: enter bag price and size for a cost estimate.
  6. Press Calculate to view results above the form.
  7. Use Download CSV or Download PDF to save outputs.
Safety note: Avoid charcoal briquettes, lighter fluid residues, and salty aquarium carbon. Choose clean, horticultural-grade activated charcoal.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.