Mulch Bag Calculator
Enter your bed area and depth to get the exact number of mulch bags to buy — works with 1, 2 and 3 cu ft bags.
Enter your measurements to see what to buy.
How to calculate it
Enter your bed area and depth to get the exact number of mulch bags to buy — works with 1, 2 and 3 cu ft bags.
Source: Volume = area × depth; bagged mulch is sold in 1, 2 or 3 cu ft bags. 1 cubic yard = 27 cubic feet.
A 10×10 ft bed at 3 in deep = 25 ft³. In 2 cu ft bags with 5% waste: 25 × 1.05 ÷ 2 = 13.1 → 14 bags.
Want the full step-by-step walkthrough? Read our How Much Mulch Do I Need? A Bed-by-Bed Guide.
Purchasing & waste guidance
- 2–3 in is ideal for garden beds; 1 in refreshes existing mulch.
- 13.5 bags of 2 cu ft mulch, or 9 bags of 3 cu ft, make one cubic yard.
- Bulk by the yard is usually cheaper once you need more than about 13 bags.
- Keep mulch a few inches away from tree trunks and house siding to prevent rot.
Assumptions & what’s included
- Bed is a single rectangle; depth is the finished mulch depth.
- Bag size is the cubic feet printed on the bag (1, 2 or 3 cu ft).
- Waste allowance covers settling and uneven spreading. Price is per bag and optional.
Frequently asked questions
How many bags of mulch do I need for a 10×10 bed?
A 10×10 ft bed at 3 in deep needs about 25 ft³, or 13 bags of 2 cu ft mulch with a 5% waste allowance. The calculator adjusts for any bag size and depth.
How many 2 cu ft bags of mulch equal a cubic yard?
One cubic yard is 27 cubic feet, so it takes 13.5 bags of 2 cu ft mulch or 9 bags of 3 cu ft mulch to make a yard.
How deep should mulch be?
2–3 in for garden beds, 1 in to refresh existing mulch, and 4 in or more for paths and playgrounds. Avoid piling mulch against tree trunks.
Related guides
Step-by-step project guides that use this calculator.