Ti Calculator

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Expert Reviewer: David Chen, Master Gardener & Certified Horticulturist
Fact-checked for accuracy in gardening and soil calculations.

Planning a garden or lawn improvement? Use our Peat Moss Calculator to determine exactly how many cubic feet or bags of peat moss you need for your specific coverage area and depth.

Peat Moss Calculator

Estimated Volume Needed:
0.00 Cu. Ft.

Peat Moss Calculator Formula

Volume (Cu. Ft.) = (Length × Width × (Depth / 12))

Source: Old Farmer’s Almanac – Soil Estimator | University Extension Reference

Variables Explained:

  • Length: The total horizontal measure of the area in feet.
  • Width: The vertical measure of the area in feet.
  • Depth: How thick you want the peat moss layer to be (typically 1 to 3 inches for soil amendment).
  • Volume: The total cubic capacity needed to cover the designated area.

What is a Peat Moss Calculator?

A Peat Moss Calculator is a specialized tool used by gardeners and landscapers to determine the volume of organic material needed for soil conditioning. Peat moss is highly absorbent and excellent for retaining moisture and nutrients, but because it is often sold in compressed bales, calculating exact coverage can be tricky.

This tool helps you translate your garden dimensions (Length and Width) and your desired thickness (Depth) into cubic feet. This ensures you buy the right number of bags without overspending or running out in the middle of a project.

How to Calculate Peat Moss (Example)

If you have a flower bed that is 10 feet long and 5 feet wide, and you want to add a 2-inch layer of peat moss:

  1. Calculate square footage: 10 ft × 5 ft = 50 sq. ft.
  2. Convert depth to feet: 2 inches / 12 = 0.1667 feet.
  3. Multiply area by depth: 50 sq. ft. × 0.1667 ft = 8.33 cubic feet.
  4. Determine bags: If using a standard 3.8 cu. ft. expanded bag, you would need approx 2.2 bags.

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Frequently Asked Questions (FAQ)

How deep should I apply peat moss? For soil amendment, a layer of 1 to 3 inches is standard. If you are mixing it into existing soil, 2 inches is the most common recommendation. Does peat moss come compressed? Yes, most commercial peat moss is compressed in ratios like 2:1. A 3.8 cu. ft. compressed bale often expands to approximately 7-8 cu. ft. of loose material. Can I use peat moss for my lawn? Peat moss is excellent as a top dressing for new grass seed to keep it moist during germination. Is peat moss acidic? Yes, peat moss typically has a low pH (3.5 to 4.5), which is great for acid-loving plants like blueberries and azaleas.
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