Project Inputs
Metric mode uses meters for length and width, centimeters for depth, and kilometers for distance. Imperial mode uses feet, inches, and miles.
Example Data Table
| Scenario | Area | Depth | Density | Billable Tons | Trips | Estimated Total |
|---|---|---|---|---|---|---|
| Front garden path refresh | 420 ft² | 3 in | 1.60 tons/m³ | 5.391 tons | 1 | $575.62 |
| Metric courtyard topping | 36 m² | 7 cm | 1.55 tons/m³ | 4.222 tons | 1 | $454.96 |
| Large driveway replenish | 900 ft² | 4 in | 1.70 tons/m³ | 16.052 tons | 2 | $1,283.94 |
Formula Used
- Area = Length × Width
- Base Volume = Area × Converted Depth
- Adjusted Volume = Base Volume × (1 + Waste %) × (1 + Compaction %)
- Required Tons = Adjusted Volume in m³ × Gravel Density
- Billable Tons = greater of Required Tons or Minimum Order Tons
- Trips Needed = ceiling(Billable Tons ÷ Truck Capacity)
- Distance Cost = Distance × Distance Rate × Trips
- Fuel Charge = (Base Delivery Fee + Distance Cost) × Fuel Surcharge %
- Pre-Discount Total = Material + Delivery + Fuel + Placement + Rush
- Grand Total = (Pre-Discount Total − Discount) + Tax
This method helps estimate delivered gravel budgets for gardening projects, but supplier pricing, truck policies, and local taxes can vary.
How to Use This Calculator
- Choose imperial or metric mode to match your site measurements.
- Enter project dimensions, gravel depth, density, and waste allowance.
- Fill in delivery pricing details such as truck size, distance, fees, and surcharges.
- Click Calculate Delivery Cost to see the summary above the form.
- Review tons, trips, utilization, and total budget before placing your gravel order.
- Use the CSV and PDF buttons to save the estimate for quoting or comparison.
Frequently Asked Questions
1. Why does the calculator show billable tons instead of only required tons?
Many suppliers enforce minimum loads or round pricing to practical truck quantities. Billable tons reflect what you may actually pay, even when the project physically needs slightly less gravel.
2. What density should I enter for gravel?
Use the supplier’s stated bulk density whenever possible. Crushed stone, pea gravel, and decorative rock can vary, so the right density improves tonnage and cost accuracy.
3. Why include waste and compaction percentages?
Waste accounts for spillage, uneven spreading, and site variation. Compaction accounts for settling after installation. Together, they help avoid under-ordering and costly follow-up deliveries.
4. Does the delivery distance cost cover multiple trips?
Yes. The calculator multiplies the distance rate by the number of required trips. Larger jobs often need more than one load, which increases total hauling expense.
5. Can I use this for driveways, paths, and garden beds?
Yes. It works for most rectangular landscaping areas. For irregular spaces, split the site into smaller rectangles, calculate each section, then add the totals.
6. What does truck utilization mean?
Truck utilization shows how full the trucks are across the planned trips. Lower utilization may signal that a smaller truck or grouped delivery schedule could reduce waste.
7. Should tax be applied before or after a discount?
This page applies discount first and tax after. That matches many billing workflows, but local rules differ, so confirm the order with your supplier or accountant.
8. Is this result a quote or just an estimate?
It is an estimate for planning. Final quotes can change because of supplier policies, delivery windows, seasonal fuel changes, access limits, or local tax rules.