Tonnage Calculator

Find the tonnage of aggregate, gravel or stone for a project.

How the Math Works

The Tonnage Calculator uses the formula: tons = area × (depth ÷ 12) × density ÷ 2000. Here's how it works: First, multiply the area (in square feet) by the depth (converted from inches to feet by dividing by 12) to calculate the volume in cubic feet. Next, multiply by the material's density (in pounds per cubic foot) to convert volume to weight in pounds. Finally, divide by 2000 to convert pounds to tons, since 1 ton equals 2000 pounds. This step-by-step process ensures accurate tonnage calculations for bulk materials like gravel, soil, or sand.

Practical Applications

To apply this calculator practically, start by measuring the area you want to cover (length × width in feet) and determine the desired material depth in inches. Find the density of your chosen material (often provided by suppliers in lbs/ft³), then plug these values into the formula. For example, a 200 ft² driveway with 4 inches of gravel (density 100 lbs/ft³) would yield 200 × (4/12) × 100 ÷ 2000 = 3.33 tons. This helps you order the exact quantity needed, preventing costly over-purchasing or project delays from shortages.

Day-to-Day Use

In everyday life, this calculator is invaluable for DIY enthusiasts and professionals alike. Homeowners planning garden beds, patios, or driveways can quickly estimate material needs, ensuring they budget effectively and avoid multiple trips to the supplier. Contractors can streamline job planning by calculating material requirements for multiple projects, reducing waste and optimizing delivery schedules. By converting measurements into tons, users also simplify cost comparisons between suppliers, as pricing is often listed per ton, making it easier to find the most economical option for their project.

Worked example

400 ft² at 4 in, 100 lb/ft³ → ~6.7 tons.

FAQ