Landscaping
Gravel Calculator
Estimate gravel volume and approximate tons for paths, driveways, garden beds, and drainage-strip top dressing from area, depth, density, and overage.
Calculator inputs
Gravel Calculator Results
Results update in your browser as you edit inputs. They are planning estimates, not complete shopping lists.
Enter project dimensions to calculate material quantity.
Assumptions
- The area is treated as a rectangle with even depth.
- Density varies by material, moisture, compaction, and supplier.
- The overage factor is a planning allowance for compaction, settling, uneven areas, and small losses.
- This is a volume and approximate weight estimate, not a delivery quote.
- Cost outputs use only the unit prices you enter.
Formula
- Cubic feet = length x width x depth in feet.
- Cubic yards = cubic feet divided by 27.
- Overage volume = base volume x (1 + compaction / overage factor).
- Tons estimate = overage cubic yards x density in tons per cubic yard.
How to Use the Gravel Calculator
- Enter the length and width of the gravel area in feet.
- Enter depth in inches.
- Choose an approximate density or use a supplier density if you know it.
- Add compaction or overage for uneven ground, settlement, and field loss.
- Use cubic yards for volume planning and tons only as an approximate weight estimate.
Gravel Calculator Examples
20 ft x 10 ft area at 4 in deep
A 20 ft by 10 ft area at 4 in deep is about 66.67 cu ft, or 2.47 cu yd, before overage. With 10% overage and 1.4 tons per cu yd, the estimate is about 3.80 tons.
- Area: 200 sq ft
- Depth: 4 in
- With 10% overage: about 2.72 cu yd
- Approximate weight: about 3.80 tons
20 ft x 4 ft walkway at 3 in deep
A 20 ft by 4 ft walkway at 3 in deep needs about 20 cu ft, or 0.74 cu yd, before overage. With 10% overage, it is about 0.81 cu yd.
- Area: 80 sq ft
- Depth: 3 in
- Base volume: about 20 cu ft
- With 10% overage: about 0.81 cu yd
1 m wide drainage strip top-dressed with gravel
A 1 m wide by 10 m long strip is about 3.3 ft by 32.8 ft, or about 108 sq ft. A 2 in gravel top layer needs about 18 cu ft, or 0.67 cu yd, before overage.
- Approximate area: 108 sq ft
- Depth: 2 in
- Base volume: about 18 cu ft
- Use only for top-dressing quantity, not drain design
Units and Parameters Quick Reference
Gravel volume and weight inputs
Gravel weight varies by material type, moisture, compaction, and supplier.
| Input | Unit | Planning note |
|---|---|---|
| Length and width | ft | Used to calculate area. |
| Depth | in | Converted to feet for volume. |
| Density | tons/cu yd | Used for approximate tons. |
| Overage | % | Adds volume after the base calculation. |
| Cubic yards | cu yd | Common bulk material planning unit. |
Use supplier guidance for exact delivery weight or compaction requirements.
Common gravel quantity planning uses
Use this calculator for loose gravel quantity planning when the main question is cubic feet, cubic yards, or approximate tons. It works best for rectangular areas with an even planned depth.
For paver patios and walkways, use a base-specific calculator instead because the compacted gravel base and bedding sand are separate layers.
Gravel use cases and what to enter
| Use case | Depth input | Important note |
|---|---|---|
| Decorative garden bed | Finished decorative depth | Plant displacement and edging are not modeled. |
| Gravel path | Finished path surface depth | Keep base, edging, and fabric decisions separate. |
| Driveway top-up | Added gravel depth | Existing ruts and compaction can change the actual quantity. |
| Drainage strip top dressing | Top gravel cover depth | Drain design, pipe, fabric, and outlet are outside this calculator. |
The calculator estimates material quantity only. It does not choose a gravel type or drainage design.
Gravel for pavers
Use the general gravel calculator for simple gravel paths, beds, and volume-to-tons estimates. If the gravel is for a patio or walkway under pavers, use a base-specific estimate with bedding sand.
Example calculation
Example: 20 x 4 path
A 20 ft by 4 ft path at 3 in deep needs about 20 cubic feet, or 0.74 cubic yards, before overage. With 10% overage at 1.4 tons per cubic yard, that is about 1.14 tons.
Common mistakes
- Forgetting depth is entered in inches.
- Treating tons as exact when density varies.
- Skipping compaction and base-layer requirements.
FAQ
Is the tons estimate exact?
No. It is an approximation based on the density value you select.
Does this include delivery fees?
No. The calculator does not provide supplier pricing or delivery quotes.
How much gravel do I need for 100 square feet?
At 2 inches deep, 100 sq ft needs about 16.67 cu ft, or 0.62 cu yd, before overage. At 3 inches deep, it needs about 25 cu ft, or 0.93 cu yd, before overage.
Can I use this for a gravel path over a French drain?
Use it only for the top gravel quantity after the drain layout, pipe, fabric, and drainage details are already decided. The calculator estimates volume and tons; it does not design the drain.
What depth should I enter for a gravel path?
Use the planned finished gravel depth for the path surface. Decorative paths may use a shallower layer than a driveway or structural base, so confirm the build-up before ordering.
How do I convert gravel cubic yards to tons?
Multiply cubic yards by the density in tons per cubic yard. The result is approximate because density changes by material and moisture.
What depth should I use for gravel?
Depth depends on use, soil, drainage, and compaction. A decorative path may use less than a driveway base, so check project requirements.
Should I add overage for gravel?
Often yes. Overage helps account for compaction, uneven subgrade, settlement, and small losses during spreading.
How many cubic yards of gravel fit a 20 ft by 4 ft path?
At 3 inches deep, a 20 ft by 4 ft path is about 0.74 cu yd before overage and about 0.81 cu yd with 10% overage.
Can this calculate pea gravel, crushed stone, or river rock?
Yes for volume. For tons, choose the closest density preset or use supplier guidance because stone type, size, and moisture can change weight.
Does the calculator choose fabric, edging, or base material?
No. It only estimates gravel volume and approximate tons. Keep fabric, edging, base preparation, drainage, and compaction decisions separate.
Sources and review notes
Reviewed . These references support the unit conversions and planning assumptions on this page. Confirm the exact product label and local project requirements before buying material.
- Methodology and calculation boundaries HomeMaterialCalc. Site-wide formula, rounding, local-calculation, and user-entered price policies.
- NIST Guide to the SI, Appendix B: Conversion Factors National Institute of Standards and Technology. Length, area, and volume unit conversions used in calculator formulas.
Related Planning Tools
Use these related calculators when the same project needs another material estimate. Each link opens a browser-based tool with its own assumptions and formulas.
Related Material Guides
Read these planning guides when you want more context for the assumptions, depth, thickness, waste factor, or bag-yield inputs used by this calculator.
Use this quick depth checklist before estimating gravel, bedding sand, compaction overage, and total paver project materials.
Pavers guide Paver Patio Slope Guide: How Much Drop Away From the House?Check common paver patio slope ranges, convert slope to total drop, and note drainage risks before estimating base materials.
Pavers guide Why Are My Pavers Sinking?Match sinking, rocking, low edges, joint washout, and drainage problems to likely causes before planning a repair material list.
Pavers guide Can You Lay Pavers on Sand Only?Use this decision checklist to separate bedding sand from structural base material before planning a patio, walkway, or small reset.
Pavers guide Paver Patio Material ChecklistUse this material-first checklist to prepare planner inputs for base gravel, bedding sand, paver count, edge restraint, joint sand, and overage.
Pavers guide How to Clean Paver Joints Before Re-SandingCheck joint depth, debris, weeds, loose pavers, drainage, and normal new paver gaps before adding joint sand or polymeric sand.
Concrete guide Recommended Concrete Slab Thickness for Patios, Sheds, and DrivewaysLearn how slab thickness affects concrete volume, bag count, and planning assumptions before estimating material quantity.
Mulch guide Mulch Depth GuideUse this guide to compare mulch depth, cubic yards, 2 cu ft bags, and settling overage before estimating a landscape bed.