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MulchCalculator.mulchNeeded
10.00m³
MulchCalculator.allUnits
How Much Mulch Do I Need?
The formula is simple: Volume = Area × Depth. If you have a 50 m² garden bed and want 10 cm of mulch, you need 0.10 m × 50 m² = 5 m³. That equals roughly 6.5 cubic yards, 177 cubic feet, or 5,000 litres.
Use the Mulch Needed tab above to do this calculation instantly in any unit combination. Switch the output to cubic yards, cubic feet, or litres to match how your supplier sells material.
Common Mulch Depth Guidelines
Flower Beds
5–8 cm (2–3 in)
Suppresses weeds without smothering shallow roots.
Trees & Shrubs
8–10 cm (3–4 in)
Helps retain moisture and protect root zone.
Vegetable Gardens
5–7 cm (2–3 in)
Keeps soil temperature stable and weeds down.
Pathways (gravel)
5–10 cm (2–4 in)
Enough depth to suppress weeds and stay in place.
Playgrounds (bark)
15–30 cm (6–12 in)
Safety standard depth for impact attenuation.
New Lawn Prep
10–15 cm (4–6 in)
Topsoil layer before seeding or turfing.
Material Densities
Weight matters for delivery (truck payload limits) and handling. Here are typical bulk densities for common landscape materials:
| Material | kg/m³ | lbs/yd³ |
|---|---|---|
| Wood Chips | 475 | 800 |
| Bark / Bark Nuggets | 320 | 540 |
| Straw | 120 | 202 |
| Compost / Garden Mix | 650 | 1095 |
| Gravel (pea-size) | 1600 | 2694 |
| Crushed Stone | 1520 | 2560 |
| Sand | 1600 | 2694 |
| Topsoil | 950 | 1600 |
Densities are approximate and vary with moisture content and particle size.
Frequently Asked Questions
How do I calculate how much mulch I need?
Multiply your area by the desired depth. E.g. 50 m² × 0.10 m = 5 m³. This calculator handles all the unit conversions for you.
How many cubic yards of mulch do I need?
Enter your area and depth, then select yd³ as the output unit. As a guide: 1 cubic yard covers about 81 ft² at 4 inches deep.
How many bags of mulch do I need?
Open the Cost Calculator tab. Enter your bag size (e.g. 50 litres) and the calculator divides total volume by bag volume, rounding up to whole bags.
How much does mulch weigh?
It depends on the material. Wood chips are ~475 kg/m³; gravel is ~1,600 kg/m³. Use the Weight tab and select your material type.
Can I use this calculator for gravel or topsoil?
Yes. The volume and cost tabs work for any bulk material. The weight tab has presets for gravel, sand, topsoil, compost, and more.
Need to Measure Your Land Area?
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