Calculator
Example Data Table
| Project | Shape | Area | Depth | Material | Estimated Volume |
|---|---|---|---|---|---|
| Front Bed Refresh | Rectangle | 20 ft × 10 ft | 3 in | Mulch | 1.85 cu yd |
| Garden Soil Fill | Rectangle | 12 ft × 8 ft | 6 in | Soil | 1.78 cu yd |
| Tree Ring Cover | Circle | Radius 6 ft | 2 in | Mulch | 0.70 cu yd |
| Slope Patch | Triangle | Base 15 ft, Height 8 ft | 4 in | Soil | 0.62 cu yd |
Formula Used
Rectangle Area: Length × Width
Circle Area: π × Radius²
Triangle Area: 0.5 × Base × Height
Raw Volume: Area × Depth
Adjusted Volume: Raw Volume × (1 + Waste %) × (1 + Compaction %)
Bags Needed: Ceiling(Adjusted Volume ÷ Bag Volume)
Bulk Cost: Adjusted Bulk Volume × Bulk Price
Bag Cost: Bags Needed × Price Per Bag
Weight: Adjusted Volume × Density
Use inches to feet when working in imperial units. Use centimeters to meters when working in metric units.
How to Use This Calculator
- Select soil or mulch.
- Choose imperial or metric units.
- Pick the project shape.
- Enter the shape dimensions.
- Enter application depth.
- Add waste and compaction percentages if needed.
- Review or edit density, bag size, and pricing.
- Press calculate.
- Read the results above the form.
- Download the summary as CSV or PDF if required.
Project Notes
This calculator helps estimate soil and mulch for beds, borders, tree rings, planter boxes, slope repairs, and general landscape filling. It supports rectangle, circle, and triangle layouts so you can model common construction and site-preparation shapes without changing tools.
The bag estimate is useful for smaller jobs and partial refills. Bulk volume helps when ordering from a landscape supplier. Waste percentage covers spillage, uneven spread, and cleanup. Compaction percentage is useful when soil settles after watering or tamping.
Weight can matter for transport planning, wheelbarrow loading, rooftop projects, and staged deliveries. Cost comparisons help you decide between bagged products and bulk deliveries before final purchasing.
FAQs
1. What depth should I use for mulch?
Most decorative mulch jobs use 2 to 4 inches. Thin layers break down faster. Very deep layers can reduce airflow and slow water movement near plant roots.
2. What depth works for new soil placement?
New soil depth depends on the project. Raised beds often need much more depth than surface leveling. Use your design specification or site requirement before ordering material.
3. Why add a waste percentage?
Waste covers spillage, uneven grade changes, missed low spots, and leftover handling losses. A small buffer can prevent a second purchase or delivery.
4. Why is compaction important for soil?
Fresh soil can settle after watering, tamping, or traffic. Adding a compaction allowance helps you order enough material for the final finished level.
5. Should I buy bulk or bags?
Bulk usually suits larger areas and lower unit cost. Bags work well for smaller jobs, cleaner storage, and easier transport through narrow access points.
6. Can I use metric and imperial values together?
Yes, but the calculator works best when you stay in one system per estimate. Mixed input styles can cause ordering mistakes during manual checks.
7. Does density affect volume?
Density does not change required coverage volume. It changes estimated weight, which matters for hauling, lifting, structural review, and delivery planning.
8. Is this calculator useful for irregular areas?
Yes. Break the site into rectangles, circles, or triangles, calculate each section, then combine the totals for a practical estimate.