Soil and mulch volume
Estimate fill volume and bag count for rectangular beds or circular areas. Drag the graph handles to change inputs and explore the result.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
How it works
- Volume including allowance = (× / πײ/4) × × × (1+/100); Whole bags = ceil(1,000×Volume including allowance/)
- Worked example: 10 m² × 0.05 m = 0.5 m³ = 500 L; ceil(500/40) = 13 Whole bags
- Supported input limits: : 1e-12 ≤ x ≤ 1,000,000,000,000; : 1e-12 ≤ x ≤ 1,000,000,000,000; : 1e-12 ≤ x ≤ 1,000,000,000,000; : 1e-12 ≤ x ≤ 1,000,000,000,000; : 1 ≤ x ≤ 100,000; : 0 ≤ x ≤ 1,000; : 0 ≤ x ≤ 1,000,000,000,000
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
Use the intended layer depth and non-overlapping bed dimensions. Bag volume is entered in litres; bag count rounds up. Settling, compaction and irregular ground are not inferred, so choose the allowance to suit the material and site.
Sources
- NIST — conversion factor conventions Sources reviewed: 2026-10-06
- NIST — conversion factor table B.8 Sources reviewed: 2026-10-06
- OpenStax — rectangle areas and dimensional measures Sources reviewed: 2026-10-06
- OpenStax — circle area and circumference Sources reviewed: 2026-10-06
