Productive ToolboxSoil Volume Calculator
Calculate soil excavation and fill volume for construction, landscaping, and earthwork projects. Supports rectangular, circular, trench, and triangular shapes.
Soil Volume Calculator
Calculate soil excavation or fill volume for rectangular, circular, trench, and triangular shapes. Instant unit conversions and optional weight estimation.
Settings
Excavation Volume
Excavation Type
Dimensions
Optional Estimates
Typical: 1400–1800 kg/m³
Optional cost estimation
Quick Presets
What is a Soil Volume Calculator?
A Soil Volume Calculator is a construction and earthwork planning tool that estimates the volume of soil to be excavated, removed, or filled for a given project area. Accurate volume estimation is critical for budgeting material costs, scheduling equipment, and avoiding over-ordering or under-ordering fill dirt.
This calculator supports five excavation shapes — rectangular, circular, trench, triangular, and custom area — covering the most common real-world scenarios in construction, landscaping, civil engineering, and agriculture. Results are instantly converted between cubic meters, cubic feet, and cubic yards.
Optional soil density input enables weight estimation in kilograms and metric tons. An optional cost-per-unit field provides a quick project cost estimate. All calculations run entirely in your browser with no data sent to any server.
How to Use the Soil Volume Calculator
Step-by-Step Guide
- 1Select Excavation or Fill mode
- 2Choose your input unit (feet, meters, or yards)
- 3Select the excavation shape that matches your project
- 4Enter the required dimensions for that shape
- 5Optionally enter soil density for weight estimation
- 6Optionally enter cost per unit for budget estimation
- 7View instant volume results in all three units
Key Features
- ✓5 excavation shapes: rectangular, circular, trench, triangular, custom
- ✓Excavation and fill mode toggle
- ✓Real-time calculation as you type
- ✓Cubic meters, feet, and yards output
- ✓Optional weight estimation (kg and metric tons)
- ✓Optional cost estimation per unit
- ✓Step-by-step calculation breakdown
Volume Formulas by Shape
| Shape | Formula | Example |
|---|---|---|
| Rectangular | V = L × W × D | 10×5×2 ft = 100 ft³ |
| Circular | V = π × r² × D | Ø8×1.5 ft ≈ 75.4 ft³ |
| Trench | V = L × W × D | 20×0.6×1.2 ft = 14.4 ft³ |
| Triangular | V = 0.5 × B × H × D | 6×4×2 ft = 24 ft³ |
| Custom Area | V = Area × D | 50 ft² × 2 ft = 100 ft³ |
Example Calculations
| Project | Dimensions | Volume (m³) | Volume (ft³) |
|---|---|---|---|
| Foundation pit | 10×5×2 m | 100 | 3,531 |
| Swimming pool | Ø8×1.5 m | 75.4 | 2,663 |
| Utility trench | 20×0.6×1.2 m | 14.4 | 508 |
| Triangular berm | 6×4×2 m | 24 | 847 |
| Backfill area | 50 m² × 0.3 m | 15 | 530 |
Typical Soil Density Reference
| Soil Type | Density (kg/m³) | Notes |
|---|---|---|
| Loose dry sand | 1,440–1,600 | Easy to excavate |
| Compacted sand | 1,600–1,900 | Requires more effort |
| Loam / topsoil | 1,200–1,400 | Common garden soil |
| Clay (dry) | 1,600–1,800 | Hard when dry |
| Clay (wet) | 1,800–2,000 | Heavy, sticky |
| Gravel | 1,600–2,000 | Drainage fill |
| Rock (broken) | 1,500–1,800 | Blasted material |
Who Uses This Calculator?
Contractors
Estimate excavation volumes for accurate project bidding and material ordering.
Civil Engineers
Calculate earthwork volumes for site grading, foundations, and drainage.
Landscapers
Estimate fill dirt and topsoil needed for garden beds, berms, and grading.
Homeowners
Plan basement excavations, pool installations, and yard leveling projects.
Farmers
Calculate irrigation channel and pond excavation volumes.
Site Managers
Track earthwork progress and verify contractor volume estimates on-site.
Frequently Asked Questions
What is the difference between excavation and fill volume?
Excavation volume is the amount of soil removed from a site. Fill volume is the amount of soil needed to raise or level an area. The same formula applies to both — the mode toggle simply labels the result appropriately for your project type.
How do I convert cubic meters to cubic yards?
1 cubic meter = 1.30795 cubic yards. The calculator handles this conversion automatically. For example, 100 m³ = 130.8 yd³.
What soil density should I use?
Typical values range from 1,400 kg/m³ for loose topsoil to 1,800 kg/m³ for compacted clay. Use 1,600 kg/m³ as a general default for mixed soil. Check with your geotechnical report for site-specific values.
How do I calculate volume for an irregular shape?
Use the Custom Area mode. First calculate the cross-sectional area of your irregular shape using another tool (such as the Polygon Area Calculator), then enter that area value along with the depth to get the volume.
Does the calculator account for soil swell or compaction?
No — the calculator gives the in-situ (bank) volume. Excavated soil typically swells 10–30% when loose, and fill soil compacts 10–20% when placed. Apply a swell or compaction factor to the result for accurate truck load or fill material estimates.
How accurate is the circular excavation formula?
The formula V = π × r² × depth gives the exact volume of a perfect cylinder. For tapered or conical excavations, the actual volume will be less. Use the triangular or custom area mode for tapered shapes.
Related Tools
Earth Filling Calculator
Calculate earth fill material volume for construction, land filling, ponds, and foundations. Includes compaction adjustment, truckload estimation, and cost calculation.
Excavation Cost Calculator
Estimate excavation and digging costs for foundations, trenches, ponds, and land leveling. Includes soil type multipliers, labor, equipment, and transport costs.