覆盖物计算器
计算花坛、树木环带、小径和景观项目所需的覆盖物用量。输入区域的长度、宽度和深度，即时获得立方码、立方英尺、袋数（2 立方英尺和 3 立方英尺）和预估重量。
Mulch Calculator
Estimate cubic yards, bags needed, and weight for your mulching project
Recommended: 2–3 inches for flower beds, 3–4 inches for trees & shrubs
Frequently Asked Questions
我需要多少立方码覆盖物（Mulch）？
计算公式：立方码 = (长度英尺 × 宽度英尺 × 深度英寸) / (12 × 27)。例如20×15英尺床，深3英寸：立方码 = (20×15×3) / 324 = 2.78立方码。公制计算：立方米 = 长(m) × 宽(m) × 深(m)。
覆盖物应该铺多厚？
推荐厚度：有机覆盖物（木屑、树皮）3-4英寸（7.5-10厘米）；细质覆盖物（松针、稻草）2-3英寸；无机覆盖物（砾石）2-3英寸；树根周围留2-3英寸空隙防腐烂。过厚（超过4英寸）会阻碍水分渗透和气体交换；过薄则抑草效果差。
覆盖物有什么好处？
覆盖物的主要益处：抑制杂草生长（减少80-90%杂草）；保持土壤水分（减少蒸发达50%）；调节土壤温度（夏季降温、冬季保暖）；防止土壤侵蚀；有机覆盖物分解后改善土壤结构；美化景观外观。
不同类型的覆盖物有何优劣？
木屑/树皮：最常见，适合树木周围，分解较慢（1-3年）；堆肥：营养丰富，改良土壤效果好，分解快（需每年补充）；稻草：价格低廉，适合蔬菜园，但可能含杂草种子；砾石/鹅卵石：不分解，适合干旱景观，导热性强；松针：适合酸性土壤植物（杜鹃、蓝莓）。
一袋覆盖物能覆盖多大面积？
标准2立方英尺袋：3英寸厚可覆盖约8平方英尺；2英寸厚可覆盖12平方英尺。标准3立方英尺袋：3英寸厚可覆盖约12平方英尺；2英寸厚可覆盖18平方英尺。计算所需袋数：袋数 = 总面积(平方英尺) × 深度(英寸) / 12 / 每袋立方英尺。
覆盖物多久需要更换一次？
有机覆盖物（木屑）通常每1-3年更换一次，因为会逐渐分解。检查标准：厚度不足1.5英寸时补充；有大量杂草穿透时；覆盖物出现病菌或异味时。无机覆盖物（砾石）不分解，但每2-3年需补充因沉降减少的部分，并清除其中积累的有机物。
覆盖物有助于防冻吗？
是的，覆盖物是优秀的隔热材料。秋季在多年生植物根部覆盖3-6英寸有机物（叶片、稻草）可使根部土壤温度高出周围2-4°C，帮助植物越冬。春季应在最后一次霜冻前适当掀开，避免阻碍植物萌发和过多保留湿气导致根腐。
是否应该在覆盖物下铺园艺地布？
不推荐在花坛中使用园艺地布（也称防草布）。虽然短期内效果好，但时间一长，杂草种子会在地布上积累的覆盖物中生根，反而更难清除。地布还会阻碍有机覆盖物与土壤的交换，影响土壤健康。在非种植区（步道、停车区旁）使用地布效果较好。
Mulch Calculator: Complete Guide to Estimating Cubic Yards & Bags
The Mulch Calculator helps you determine exactly how much mulch to buy for garden beds, tree rings, pathways, and landscaping projects. Enter the area dimensions and desired depth to instantly get cubic yards, cubic feet, bag counts for 2 cu ft and 3 cu ft bags, and an estimated weight.
Table of Contents
How to Calculate Mulch Volume
Mulch volume is calculated by multiplying the area by the desired depth. Because depth is typically measured in inches but length and width are in feet, you divide the depth by 12 to convert it:
Cubic Feet:
Cubic Feet = Length (ft) × Width (ft) × Depth (in) ÷ 12Cubic Yards:
Cubic Yards = Cubic Feet ÷ 27Bags Needed:
Bags = ⌈Cubic Feet ÷ Bag Size (cu ft)⌉Example:
A 10 × 10 ft bed at 3 inches deep: 10 × 10 × (3÷12) = 25 cu ft = 0.93 cu yd. That requires 13 bags of 2 cu ft or 9 bags of 3 cu ft.
Recommended Depth by Mulch Type
The optimal depth varies by mulch type and application. Using too little mulch won’t suppress weeds; too much can smother plant roots and cause stem rot.
| Mulch Type | Recommended Depth | Notes |
|---|---|---|
| Shredded hardwood | 2–3 inches | Great for most garden beds; decomposes slowly |
| Wood chips | 3–4 inches | Ideal for trees, shrubs, and pathways |
| Bark nuggets | 3–4 inches | Long-lasting; decorative appearance |
| Straw / pine straw | 3–6 inches | Lightweight; good for vegetable gardens |
| Rubber mulch | 2–3 inches | Playground areas; does not decompose |
| Compost / leaf mulch | 1–2 inches | Nutrient-rich; use thinner layer to avoid smothering |
Always keep mulch 2–3 inches away from plant stems and tree trunks to prevent rot and pest issues.
Coverage Table: 1 Cubic Yard of Mulch
One cubic yard (27 cubic feet) of mulch covers the following areas at common depths:
| Depth | Coverage (sq ft) | Example Area |
|---|---|---|
| 1 inch | 324 sq ft | 18 × 18 ft |
| 2 inches | 162 sq ft | 13 × 12.5 ft |
| 3 inches | 108 sq ft | 10 × 10.8 ft |
| 4 inches | 81 sq ft | 9 × 9 ft |
| 6 inches | 54 sq ft | 7 × 7.7 ft |
Tips for Mulching
Before You Mulch
- Remove weeds and old mulch if it has become compacted or mold-prone
- Edge garden beds to prevent mulch from spreading onto lawns
- Water the soil before applying mulch in dry conditions
- Add a 10% overage to your estimate for settling and edges
Application Best Practices
- Keep mulch 2–3 inches away from plant stems and trunks
- Avoid “volcano mulching” piled up against tree bases
- Refresh mulch annually — top off rather than complete replacement
- Fluff existing mulch with a rake before adding new material
Buying Tips
- Bulk mulch (by the yard) is 30–50% cheaper than bagged mulch
- A standard pickup truck can hold ~1 cubic yard safely
- Order bulk mulch when covering more than 3 cubic yards
- Dyed mulches fade over time; natural mulch blends into the landscape
Weed Suppression
- A 3-inch layer blocks most weed seeds from germinating
- Lay landscape fabric beneath for persistent weed areas
- Organic mulch breaks down and enriches soil over time
- Reapply in early spring and after heavy rains erode thin spots