Mulch Calculator
Stop guessing at the garden center. Enter your bed area and mulch depth to instantly get cubic yards, cubic feet, and the number of bags (1.5 or 2 cu ft) to buy.
How to use Mulch Calculator
The mulch calculator estimates cubic yards and bags of mulch for garden beds, borders and landscapes. Enter the area dimensions and desired depth to find the quantity needed, with coverage estimates for standard 2 cu ft bags.
- Enter length and width (or area in sq ft) of the area.
- Set the mulch depth (2–4 inches recommended).
- Review cubic yards and number of standard 2 cu ft bags.
- Add an optional price to get total material cost.
Your data never leaves your device — 100% private processing.
Mulch depth recommendations
The ideal mulch depth balances weed suppression with avoiding moisture problems. Shredded hardwood at 3 inches provides good weed suppression while allowing water penetration. Inorganic mulch (gravel, rubber) can go deeper without rotting but doesn't add organic matter. Too deep (>4") can prevent oxygen from reaching roots and create a habitat for pests.
| Depth | Coverage per cu yd | Bags needed (2 cu ft) per 100 sq ft |
|---|---|---|
| 1 inch | 324 sq ft | ~6 bags |
| 2 inches | 162 sq ft | ~12 bags |
| 3 inches | 108 sq ft | ~18 bags |
| 4 inches | 81 sq ft | ~25 bags |
Mulch types comparison
Shredded hardwood and bark mulch decompose over 1–2 years, adding organic matter and improving soil. Pine straw is lightweight, acidic (good for acid-loving plants) and slow to decompose. Cedar and cypress mulch repel insects and last longer. Rubber mulch (recycled tyres) lasts 10+ years with no decomposition but adds no soil benefit. Gravel is permanent and low-maintenance.
Glossary
- Cubic yard
- 27 cubic feet — the standard unit for bulk landscape materials.
- Organic mulch
- Mulch that decomposes and adds organic matter to soil (wood, straw, leaves).
- Inorganic mulch
- Non-decomposing mulch (gravel, rubber) that suppresses weeds without adding nutrients.
- Topdressing
- Adding a thin layer of fresh mulch on top of existing mulch to refresh appearance.
Related reading
Frequently Asked Questions
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Why use Mulch Calculator?
- Accurate material estimates reduce waste and over-ordering
- Supports both metric and imperial measurements
- Covers common materials: concrete, lumber, flooring, paint
- Results include waste factor buffers for professional accuracy
Common use cases
- Calculate concrete needed for a driveway
- Estimate flooring tiles for a room renovation
- Work out paint quantity for interior walls
- Calculate lumber needs for a deck project
- Estimate roofing material for a pitched roof
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