Estimate how much soil amendment to add to a garden, raised bed, lawn area, flower bed, or planting area. Calculate compost, manure, peat moss, gypsum, lime, sulfur, organic matter, pounds, cubic feet, cubic yards, bags, and cost.
Depth mode:
The calculator uses garden area and amendment depth to estimate cubic feet, cubic yards, pounds, bags, and cost.
Rate mode:
The calculator uses an application rate such as pounds per 100 square feet or cubic feet per 100 square feet.
pH mode:
The calculator gives a rough lime or sulfur estimate based on pH change, area, mixing depth, and soil texture.
Bag coverage mode:
The calculator estimates how many bags are needed based on the coverage listed on the bag.
A soil amendment calculator helps estimate how much material is needed before buying compost, lime, sulfur, gypsum, manure, peat moss, or other soil products.
It can help avoid buying too little, over-applying amendments, underestimating bag counts, or guessing costs for garden beds, lawns, and planting areas.
Your result shows cubic feet, cubic yards, pounds, bags needed, cost, amendment depth, amendment percent by volume, area covered, and estimated material amount based on the selected calculation method.
Measure the area, choose an amendment depth or application rate, then calculate the volume or weight needed. Add extra material if the area is uneven or bags settle.
Many garden beds use a layer of compost measured by depth, such as 1 to 3 inches, then mix it into the top several inches of soil depending on the crop and soil condition.
There are 27 cubic feet in 1 cubic yard.
Lime is commonly used to raise acidic soil pH. Sulfur is commonly used to lower alkaline soil pH. Use a soil test before making major pH changes.
No. This is an estimate. Actual soil amendment needs vary by soil test results, soil texture, organic matter, crop type, product strength, moisture, compaction, and local growing conditions.