Estimate mulch, soil or topsoil volume from region areas and layer depths. The calculator combines up to 10 regions, reports ft³, yd³ and m³, rounds up whole bags and compares optional bagged and bulk material costs. Material choice identifies your task without assuming density or recommended depth.
Use it for garden beds, uniform layers and rectangular or circular footprints. Different regions can have different depths. For irregular boundaries, use square footage to measure net area, then choose Known area. For aggregate purchased by weight see gravel.
Rectangles need length and width; circles use diameter; known-area mode accepts total area. US mode uses ft, ft² and in depth. Metric mode uses m, m² and cm depth. Bag volume can be ft³, litres or m³. Allowance is 0–100%. Prices and bulk density are optional. Density always uses kg/m³, even with US dimensions.
Region volume = area×depth. Rectangle area = length×width; circle area = π×(diameter/2)². Adjusted volume = sum of regions×(1+allowance/100). Whole bags = ceiling(adjusted volume/bag volume). Bag cost = whole bags×bag price. Bulk cost uses unrounded volume priced per yd³ in US mode or per m³ in metric. Metric tonnes = volume in m³×entered density/1000.
For 100 ft² at 3 in deep, depth is 0.25 ft and volume is 25 ft³, approximately 0.925926 yd³ or 0.707921 m³. With 2 ft³ bags and no allowance, 25/2=12.5, so buy 13 bags. At an illustrative price of 4 per bag the material cost is 52. Bulk at an example 50 per yd³ costs about 46.2963. Delivery may change the real comparison.
使用包裝標明的體積。材料模式不自動指定密度或推薦鋪設深度。
先增加餘量再向上取整袋數；袋裝成本使用整袋數，散裝成本使用未取整體積。
支持最多 10 個各自均勻深度區域。覆蓋物與土壤使用相同體積公式；密度請採用實際材料數據。價格不含配送、稅費與人工，幣種僅作標籤。
規劃用量，並比較袋裝與散裝採購。