Mulch, Soil & Gravel Calculator
Calculate required bark mulch, topsoil, sand, and decorative gravel volume, compaction margin, and total weight. Features 2D garden bed visualizer, bag snapper (50L & 25kg), bulk totes, and contractor material list export.
Construction CalculatorsOrganic materials degrade and compress under rainfall; gravel and sand settle when tamped.
2D Dynamic Garden Bed Visualization
Real-time shape scale, material texture, and layer cross-section depth
Commercial Packaging & Logistics Snapper
Practical procurement breakdown based on commercial landscaping retail & bulk standards
How to Use the Mulch, Soil & Gravel Calculator
Step-by-step guide to calculating bulk landscape volume, compaction settling, retail bags, and delivery truck payloads
Select Landscaping Material & Density
Choose between Shredded Bark Mulch, Screened Dry Topsoil, Moist Garden Compost, Bedding Sand, or Crushed Gravel. The calculator automatically loads calibrated bulk densities and compaction rates.
Choose Garden Bed Shape
Select your garden bed geometry: Rectangle / Trench, Circle (radius or diameter), Triangle, or Custom Surface Area.
Input Dimensions & Measurement Units
Enter length, width, diameter, or triangle base/height. Switch smoothly between Metric (meters, cm, mm) and Imperial (feet, inches, yards).
Set Layer Depth & Compaction Margin
Choose from standard depth presets (Mulch Weed Barrier 7.5 cm, Lawn Topdressing 2.5 cm, Raised Bed 15 cm, Gravel Pathway 5 cm, Driveway 15 cm) and fine-tune settling margins.
Review Packaging & Transport Logistics
Inspect gross volume (m³ and yd³), total weight (metric tons / US tons), retail bag counts (50L or 25kg bags), 1-ton bulk totes, and estimated pickup or dump truck trips.
Copy Landscaper's Bill of Materials (BOM)
Click "Copy Material Order" to save the comprehensive purchase order directly to your clipboard for your nursery, quarry, or delivery supplier.
Frequently Asked Questions (FAQ)
Expert landscaping advice on mulch depths, compaction shrinkage, truck payload limits, and geotextile fabric
Q:What is the optimal depth for applying bark mulch in landscape beds?
The recommended depth for garden mulch is 5.0 to 7.5 cm (2 to 3 inches). A layer thinner than 5 cm allows sunlight to penetrate, failing to suppress weeds and allowing soil moisture to evaporate. Applying mulch deeper than 10 cm (4 inches) can suffocate shallow plant root systems, trap excess moisture against tree trunks causing rot, and prevent rain from reaching the underlying root zone.
Q:Why is a compaction margin (settling factor) essential when ordering bulk materials?
Bulk aggregates and organic soils are sold in a loose, aerated condition. After spreading, watering, and natural settling or mechanical plate tamping, internal air voids collapse. Shredded bark mulch settles by 15% to 20% over several weeks, loose topsoil compacts by 18% to 25%, and crushed gravel compacts by 10% to 15%. Without factoring in compaction shrinkage, your project will run short of the finished grade.
Q:How much gravel or topsoil can a standard pickup truck carry?
Although a standard 6.5-foot pickup truck bed physically holds about 1.5 to 2.0 cubic meters (2 to 2.5 cubic yards), payload weight is the critical safety bottleneck. One cubic meter of damp topsoil or crushed gravel weighs between 1,500 and 1,800 kg (3,300 to 4,000 lbs)—greatly exceeding the rear axle payload capacity of a standard half-ton pickup (typically 680 to 900 kg / 1,500 to 2,000 lbs). A half-ton truck can safely haul only about 0.5 to 0.6 m³ of gravel per trip.
Q:When is it better to purchase 25 kg / 50L retail bags versus bulk delivery?
For small gardens requiring less than 0.5 to 0.8 cubic meters (under 15 bags), retail bagged products from home centers are easier to transport, store cleanly in a car boot, and carry into tight backyards. For volumes exceeding 1.0 cubic meter (20+ bags of mulch or 40+ bags of gravel), loose bulk delivery from a local quarry or landscape supply yard is typically 40% to 60% cheaper.
Q:Should geotextile landscape weed fabric be installed under mulch or gravel?
Under decorative stone gravel pathways and driveways, non-woven geotextile fabric is mandatory—it prevents gravel from sinking into subgrade mud and prevents clay from pumping upward. However, under organic bark mulch in flowerbeds, landscape fabric is generally discouraged by horticulturists because decomposing mulch eventually creates a soil layer on top of the fabric where weeds root anyway, while the synthetic barrier blocks natural earthworm activity and soil enrichment.
Q:What is the recommended depth of crushed stone for walkways versus driveways?
For pedestrian garden paths, a finished compacted depth of 5.0 cm (2 inches) of decorative gravel over landscape fabric provides firm footing; deeper loose gravel makes walking difficult. For vehicle driveways, a structural foundation of 15 to 20 cm (6 to 8 inches) of compacted crushed aggregate base (road base / crusher run) topped with a thin 3 to 5 cm (1 to 2 inch) decorative gravel wear layer is necessary to prevent vehicular wheel rutting.
- A: Surface area of the planting bed or trench (m²)
- l, w: Length and width of rectangular border (m)
- r, D: Radius and diameter of circular pit or tree ring (m)
- b, h: Base and height of triangular border (m)
- d: Layer depth or thickness converted into meters (m)
- c: Compaction and settling allowance percentage (0% to 30%)
- ρ: Material bulk density in kilograms per cubic meter (kg/m³)
- M: Total material weight in kilograms (divide by 1,000 for metric tons)
- N: Quantized number of commercial retail bags (rounded up)