How deep should mulch be applied?

A 5-7 cm (2-3 inch) layer is ideal for most garden beds. Thinner coverage (under 5 cm) allows weeds through and dries out quickly. Going deeper than 10 cm smothers plant roots and can promote fungal diseases. Around trees, keep mulch 5-10 cm away from the trunk to prevent rot.

How much does one bag of mulch cover?

A standard 50-liter bag covers approximately 1 square meter at 5 cm depth, or 0.5 m² at 10 cm. A 40-pound bag (common in the US, ~30 liters) covers about 0.6 m² at 5 cm. Always check the bag label, as volume varies by manufacturer and material type.

What is the difference between bulk and bagged mulch?

Bulk mulch (sold by cubic yard or cubic meter) is significantly cheaper for large areas — typically 40-60% less per unit volume. Bagged mulch is more convenient for small projects and easier to transport. For areas over 10 m², bulk delivery usually saves money.

Which type of mulch lasts the longest?

Hardwood bark and cedar mulch decompose slowly, lasting 2-3 years before needing refresh. Softwood (pine) mulch breaks down in 1-2 years. Inorganic options like rubber or stone never decompose but do not improve soil quality the way organic mulches do.

Are the calculations on Mulch Calculator | Bags, Coverage Area & Cost Estimator private?

Yes, completely. All calculations are performed entirely locally inside your browser using JavaScript. No inputs or personal metrics are ever transmitted to or stored on our servers.

Mulch Calculator | Bags, Coverage Area & Cost

Mulch Calculator – Coverage EstimatorMetriova provides free online calculators for finance, business, health, and construction. Calculate loans, investments, fitness metrics, and project materials in seconds.Mulch Coverage by Bag Size and DepthMulch coverage depends on bag volume and desired depth. A 2 cu ft bag covers 24 sq ft at 1-inch depth but only 12 sq ft at 2-inch depth. Recommended mulch depth is 2-3 inches. Formula: Bags = (Area × Depth) / Bag Volume. One cubic yard (27 cu ft) covers 324 sq ft at 1-inch depth.

Bag Size

Coverage at 1" depth

Coverage at 2" depth

Coverage at 3" depth

1 cu ft bag

12 sq ft

6 sq ft

4 sq ft

2 cu ft bag

24 sq ft

12 sq ft

8 sq ft

3 cu ft bag

36 sq ft

18 sq ft

12 sq ft