Soil Mix Calculator
Estimate soil volume, choose a mix ratio, and get component breakdowns.
Quick guide
- Start by estimating the total soil volume (area x depth) and add a small buffer.
- Pick a simple mix ratio (e.g., 50/50 compost + topsoil) and adjust for your plants and drainage.
- If you're buying in bulk, confirm whether your supplier sells by cubic yards or cubic meters.
Soil Mix Calculator
Estimate soil volume, choose a mix ratio, and get component breakdowns.
Units
Optional bulk prices
Tip: leave prices blank to hide cost. If you're using metric units, enter price per cubic meter.
Results
- Total (cubic yards)
- 4.07
Component breakdown
- Compost
- 2.04 yd³
- Topsoil
- 2.04 yd³
- Sand
- 0 yd³
How to estimate total soil volume
- Measure total area (length x width) and choose an average depth for the bed.
- Convert depth to feet (in / 12) or meters (cm / 100) before volume math.
- Add waste to cover settling, uneven beds, and rounding to delivery minimums.
Assumptions to double-check
- Compost and topsoil properties vary; a 50/50 mix is a starting point, not a universal rule.
- Raised beds may settle after watering—buffers help avoid running short.
- Some mixes need amendments (perlite, peat, lime) beyond these three components.
Buying tips
- Ask whether the topsoil is screened and what the compost source is.
- If drainage is an issue, consider adding sand or other drainage-friendly amendments.
- Order a little extra for topping off after the first few waterings.
Last updated: Dec 2025
FAQ
Is 50/50 compost and topsoil a good mix?
It’s a common starting point for raised beds, but needs vary by plants and drainage. Adjust based on your soil and local advice.
Should I include sand in a soil mix?
Sometimes. Sand can improve drainage in specific situations, but too much can change texture. Use it intentionally for your project.
Why add a waste factor?
Soil can settle after watering and compaction, and it’s easy to under-measure. A small buffer helps you avoid shortages.
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Browse this category →Disclaimer
Results are estimates for informational purposes only. Always verify measurements and product specifications.