How to use it
- Enter length and width in feet.
- Adjust coverage per unit if not using the default 50 sq ft.
- Click calculate to see area and units needed.
This calculator tells you how much mulch to buy by multiplying your length by width to get total area, then dividing by the coverage per unit. The default coverage is 50 square feet per unit, but you can edit that if your product differs. The result — units needed — tells you exactly how many bags or yards to order, so you don't underbuy and delay your project or overbuy and waste money. Area is shown in square feet so you can verify the math against your space. To use it, measure the longest and widest points of your bed, enter both in feet, confirm the coverage value, and read the two outputs: total area and units required. This works for gardens, pathways, and any rectangular mulch zone.
Pro tips
- Add 10% extra for waste and uneven terrain.
- Round up to whole units — partial bags don't exist.
- Order all at once to avoid color or lot mismatches.
- Don't forget depth: this calculator assumes standard 3-inch coverage.
Real-life examples
- Prepping a new flower bed before spring planting.
- Covering a backyard pathway with shredded bark.
- Refreshing garden borders around a patio.
Case study
Maria measured her 20×15 ft garden bed, entered the dimensions, and got 600 sq ft ÷ 50 = 12 units. She ordered exactly 12 bags, avoided a second trip, and finished the project in one weekend.