About MaterialCalc101

MaterialCalc101 builds free calculators that answer the question every home and yard project starts with: how much do I need to buy? Mulch, gravel, topsoil, sand, compost and concrete, in yards, tons or bags.

Our principles

• Answers you can shop with. We round to what suppliers sell and explain why.
• Formulas in the open. Every page shows its maths, and how we calculate lists every figure we use.
• Private. Calculations run in your browser. We never see or store the numbers you type.
• Kept current. Material figures last reviewed 2026-11-11.

The site is free to use and supported by advertising. Spotted an error? Let us know and we will fix it.