How to Calculate Mulch for Your Landscape
Whether you're refreshing existing beds or starting a new landscaping project, knowing how much mulch to buy is essential. Our free mulch calculator takes the guesswork out of estimating coverage, helping you avoid costly over-ordering or frustrating shortages mid-project.
Understanding Mulch Measurements
Mulch is sold in two primary ways: bulk by the cubic yard and bags by the cubic foot. Understanding these measurements helps you compare prices and choose the best option for your project:
- 1 cubic yard = 27 cubic feet = covers 162 sq ft at 2" deep or 108 sq ft at 3" deep
- 1 standard bag = 2 cubic feet = covers about 8 sq ft at 3" deep
- 1 cubic yard ≈ 13-14 standard bags
How Deep Should Mulch Be?
The ideal mulch depth depends on your goals and the type of mulch you're using:
| Application | Recommended Depth | Purpose |
|---|---|---|
| Weed suppression | 2-3 inches | Blocks light to prevent weed seed germination |
| Moisture retention | 3-4 inches | Reduces evaporation and watering needs |
| Around trees | 2-4 inches | Protects roots, keep 3-6" from trunk |
| Pathways | 3-4 inches | Comfortable walking surface |
| Slopes/erosion control | 4-6 inches | Prevents washout during rain |
Warning: Never apply mulch deeper than 4 inches in most situations. Excessive mulch can suffocate plant roots and create moisture problems.
Types of Mulch and Their Coverage
Different mulch types have varying weights and coverage characteristics:
| Mulch Type | Weight per Cubic Yard | Lifespan | Best For |
|---|---|---|---|
| Hardwood bark | 400-800 lbs | 1-2 years | Flower beds, walkways |
| Pine bark nuggets | 350-600 lbs | 2-3 years | Slopes, acid-loving plants |
| Cedar mulch | 400-700 lbs | 2-3 years | Pest deterrent, aromatic |
| Dyed mulch | 400-800 lbs | 1-2 years | Color consistency, curb appeal |
| Pine straw | 200-300 lbs | 6-12 months | Southern landscapes, acidic soil |
| Rubber mulch | 1,200-1,500 lbs | 10+ years | Playgrounds, permanent installations |