Home › Mulch Calculator Mulch Calculator Use the calculator below to estimate the square footage you’ll need for your project. Choose from square/rectangle, circle or triangle. Square / Rectangle Circle Triangle Square / Rectangle Length (ft) Width (ft) Mulch Depth1″2″3″4″ Calculate Your total area 0 sq ft You will need approximately 0 2-cubic-foot bags 0 3-cubic-foot bags 0 cubic yards Circle Diameter (ft) Mulch Depth1″2″3″4″ Calculate Your total area 0 sq ft You will need approximately 0 2-cubic-foot bags 0 3-cubic-foot bags 0 cubic yards Triangle (must be a 90° angle) Measure the length of the two sides that meet at the right angle Side One (ft) Side Two (ft) Mulch Depth1″2″3″4″ Calculate Your total area 0 sq ft You will need approximately 0 2-cubic-foot bags 0 3-cubic-foot bags 0 cubic yards