Mulch Calculator - Calculate How Much Mulch You Need
Free mulch calculator. Enter your garden bed dimensions and get exact cubic yards, bags needed, and cost estimates. Supports rectangular and circular beds.
Beds
Bed Dimensions
Cost Estimation
Enter all dimensions to see results.
About This Calculator
How to Calculate Mulch Needed
Measuring Tips
- Measure length and width in feet using a tape measure
- For circular beds, measure the diameter and divide by 2 for radius
- Standard mulch depth is 2-4 inches depending on application
- Account for existing mulch depth when calculating new needs
- Add 5-10% extra for waste and settling
Mulch Type Guide
| Type | Best For | Depth |
|---|---|---|
| Hardwood | Flower beds, general use | 2-3 inches |
| Pine Bark | Acid-loving plants | 2-3 inches |
| Cedar | Insect repellent, decorative | 2-4 inches |
| Rubber | Playgrounds, paths | 3-4 inches |
Tips for Best Results
- Water the area before applying mulch to help it settle
- Keep mulch 2-3 inches away from plant stems and tree trunks
- Refresh mulch annually with 1-2 inches of new material
- Use landscape fabric under mulch for weed prevention
- Buy in bulk for large projects to save money
Frequently Asked Questions
How do I calculate how much mulch I need?
Measure the length and width of your garden bed in feet, then multiply by the desired depth in feet. Divide the result by 27 to convert cubic feet to cubic yards. For example, a 10ft × 10ft bed at 3 inches deep needs: 10 × 10 × 0.25 ÷ 27 = 0.93 cubic yards.
How deep should mulch be?
For most garden beds, 2-4 inches of mulch is ideal. Flower beds typically need 2-3 inches, while vegetable gardens benefit from 3-4 inches. Around trees, apply 3-4 inches but keep mulch 2-3 inches away from the trunk to prevent rot.
How many square feet does a 2 cubic foot bag of mulch cover?
A 2 cubic foot bag of mulch covers approximately 8 square feet at 3 inches deep, 12 square feet at 2 inches deep, or 6 square feet at 4 inches deep. Coverage depends on the depth you apply the mulch.
Should I remove old mulch before adding new?
Generally, no. Old mulch breaks down and adds organic matter to the soil. Simply add 1-2 inches of fresh mulch on top. However, if the old mulch is matted, moldy, or more than 4 inches thick, remove some before adding new mulch.
How much does a cubic yard of mulch weigh?
A cubic yard of mulch typically weighs 400-800 pounds depending on the type and moisture content. Hardwood mulch weighs about 400-600 lbs per cubic yard, while wet or shredded mulch can weigh 700-800 lbs.