Raised bed soil calculator
Calculate soil fill after subtracting layers and existing material, then estimate whole bags of loose soil.
Up to 10,000 identical beds and 1 million bags. Layers must leave positive soil depth. Existing soil cannot exceed the target; settling remains a user-supplied assumption. Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.
Your result
How to use Raised bed soil calculator
- Enter your measured quantities, units and assumptions.
- Review the calculated result and the stated limits.
- Download the report or plan for your project.
Useful next steps
Measure the usable bed
Use internal dimensions. Subtract the drainage and structural depths you actually have from every bed. Those fields describe space occupied; they do not recommend installing a particular layer.
Allow for existing soil and settling
Enter existing settled soil across all beds. Divide the remaining settled volume by your measured retained-volume fraction to estimate loose material, then round up to whole bags.
Save the measurements and assumptions
Download CSV and a text or JSON report. The calculation runs on your device. Changing a unit keeps the number you entered, so check both before using the result.