Lawn Top Dressing Calculator: Improve Soil Health with Organic Matter

Please note: For your convenience, this calculation has been rounded up slightly.

Important reminder: Every effort has been made to ensure the accuracy of this calculation. But before purchasing materials for any project, please check amounts with your suppliers or contractors.

Helpful Information

Top dressing is organic matter spread over soil and worked 2 inches deep with a rake. Without adequate organic matter, grass struggles.

Tips: Use compost or manure from garden centers. Avoid wood chips, straw, and other nitrogen-robbing materials. After debris removal and tilling, spread organic matter and rake in to 2-inch depth. Higher organic percentages create looser soil for easier root growth.

For most lawns, aim for 15–25% organic matter in the top 2 inches.