Mulch Calculator – How Much Mulch Do I Need?
Planning a garden project? Our free mulch calculator helps you figure out exactly how much mulch you need so you don’t buy too much or run short. Just enter your area dimensions and desired mulch depth to get your answer in seconds.
Mulch Calculator
How to Use the Mulch Calculator
- Enter the length of your garden bed in feet
- Enter the width in feet
- Enter the desired mulch depth in inches (2–4 inches is standard)
- Click Calculate
Mulch Coverage Formula
Cubic Yards = (Length × Width × Depth in inches) ÷ 324
One cubic yard covers approximately 100 sq ft at 3 inches deep.
How Much Mulch Do I Need? – Quick Reference
| Area (sq ft) | 2 inch | 3 inch | 4 inch |
|---|---|---|---|
| 100 sq ft | 0.62 cu yd | 0.93 cu yd | 1.23 cu yd |
| 200 sq ft | 1.23 cu yd | 1.85 cu yd | 2.47 cu yd |
| 500 sq ft | 3.09 cu yd | 4.63 cu yd | 6.17 cu yd |
Frequently Asked Questions
How deep should mulch be?
For most gardens, 2 to 4 inches of mulch is ideal.
How many bags of mulch is 1 cubic yard?
One cubic yard equals 27 cubic feet — about 13.5 bags (2 cu ft) or 9 bags (3 cu ft).
What type of mulch is best?
Wood chips and bark mulch are most popular. Pine straw works well for slopes.
Does mulch go bad?
Organic mulch breaks down every 1–2 years, enriching the soil. Top it up each season.