Gravel calculator
Free Gravel Calculator — Estimate Gravel, Sand, and Stone for Any Project
Use our free Gravel Calculator to accurately estimate the amount of gravel, sand, limestone, or stone required for your project. Simply enter the total area, depth, and choose material type to calculate volume (m³), mass (kg or tonnes), and optional cost. This online tool supports total area, rectangle, or circle shapes, with instant unit conversion between metric and imperial values.
How the Gravel Calculator Works
The calculator determines the required material volume and mass using the following physics-based formulas:
- Area (rectangle): A = L × W
- Area (circle): A = π × r²
- Volume: V = A × depth
- Mass: M = V × ρ
- Cost: C = M × P
Where: A — area (m²), V — volume (m³), ρ — material density (kg/m³), P — price per kg or tonne.
Typical Bulk Densities Used
- Crushed Gravel — 1600 kg/m³
- Pea Gravel — 1450 kg/m³
- Limestone — 1680 kg/m³
- Sand (dry) — 1600 kg/m³
- Wet Sand — 1850 kg/m³
- Topsoil — 1200 kg/m³
- Clay — 1750 kg/m³
- Crushed Concrete — 1500 kg/m³
- Granite Aggregate — 1685 kg/m³
- Expanded Shale — 950 kg/m³
Density data sources: Wikipedia: Density, Engineering Toolbox: Densities of Common Materials, InchCalculator Gravel Calculator.
Why Use This Gravel Calculator?
- ✅ Instant calculations with automatic unit conversion (m, ft, in, cm).
- ✅ Supports different area shapes — total, rectangle, or circle.
- ✅ Includes density presets for gravel, sand, limestone, and more.
- ✅ Optional cost estimation — per kg or per tonne.
- ✅ Fully responsive design — works on desktop and mobile.
Example Calculation
For example, if you need to cover 200 m² with a 3 cm depth of gravel (density = 1600 kg/m³): Volume = 200 × 0.03 = 6 m³, Mass = 6 × 1600 = 9600 kg = 9.6 t. If gravel costs $0.05 per kg, the total price = $480.
FAQ — Gravel Calculator
1. How do I calculate how much gravel I need?
Measure your area, enter depth, choose gravel type and density, then click Calculate — the tool shows volume, weight, and cost instantly.
2. What units does the calculator support?
You can enter values in meters, feet, inches, or centimeters and the calculator automatically converts between metric and imperial units.
3. What is the typical density of gravel?
Crushed gravel is usually around 1600 kg/m³, but can vary depending on size and moisture content.
4. Can I use it for sand or limestone?
Yes — the calculator includes preset densities for sand, limestone, and other aggregates, or you can enter a custom density.
5. How accurate are the results?
The calculator uses industry-standard bulk densities and precise floating-point math, making it suitable for landscaping and construction planning.
6. Can I calculate price automatically?
Yes, if you enter a price per kg or per tonne, it will estimate the total material cost.
