Mulch Volume Calculator Formula
Understand the math behind the mulch volume calculator. Each variable explained with a worked example.
Formulas Used
Cubic Yards
cubic_yards = vol_cuft / 27Bags Needed
num_bags = bag_size > 0 ? ceil(vol_cuft / bag_size) : 0Total Volume
volume_cuft = vol_cuftVariables
| Variable | Description | Default |
|---|---|---|
area_sqft | Total Bed Area(sq ft) | 300 |
depth_in | Mulch Depth(in) | 3 |
bag_size | Bag Size(cu ft) | 2 |
vol_cuft | Derived value= area_sqft * depth_in / 12 | calculated |
How It Works
Mulch Volume Calculation
Volume = Area x Depth (in feet)
Convert depth from inches to feet by dividing by 12. Divide cubic feet by 27 for cubic yards, or divide by bag size for the number of bags. For bulk delivery, 1 cubic yard covers about 108 sq ft at 3 inches deep.
Worked Example
300 sq ft of beds at 3 inches, using 2 cu ft bags.
area_sqft = 300depth_in = 3bag_size = 2
- 01Volume = 300 x (3/12) = 75 cu ft
- 02Cubic yards = 75 / 27 = 2.8
- 03Bags = 75 / 2 = 38 bags
Ready to run the numbers?
Open Mulch Volume Calculator