Mulch Calculator

Estimate mulch volume for landscaping beds.

Mulch Calculator helps you volume and bags of mulch for a garden bed. Enter length, width, depth, and bag size, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Mulch calculator does Mulch Calculator is built for materials, areas, volumes, and jobsite estimates. Volume and bags of mulch for a garden bed. You enter length, width, depth, and bag size, then Simple Calculators computes the result instantly. Formulas match common contractor and DIY references for rectangular and simple shapes. How the math works Same volume math as gravel. Bags = volume / bag size. The formula: Cubic feet = length × width × (depth in inches ÷ 12); bags = cubic feet ÷ bag size. Cubic yards = cubic feet ÷ 27. Metric: cubic meters = length × width × (depth in cm ÷ 100).