Construction Calculators

Every construction material estimate starts with three measurements: length, width, and depth. Length and width give you area in square feet. Multiply by depth (converted to feet) and divide by 27 to get cubic yards, the standard unit for bulk materials like concrete, gravel, and sand. Most suppliers quote and deliver by the cubic yard, so that is the number to have ready when you call.

Always add 10% for waste. On a concrete pour, waste comes from spillage, uneven subgrade, and overfill in low spots. On gravel, it accounts for settling over the first few months. On lumber and drywall, it covers cut loss. Our calculators apply this 10% automatically. The result shown is what you order, not the theoretical minimum.

For L-shaped or irregular areas, break the space into rectangles. Calculate each section separately and add the cubic yard totals. For circular areas like round footings or round patios, use the circle mode in the appropriate calculator.