Free garden tools

Free Garden Calculators & Tools

Fast, practical calculations for gardeners, landscapers, growers, and commercial applications.

No sign-up required. Entries stay in this browser. This calculator code does not send your entries to NutriHarvest.

Fertilizer Application & Quantity Calculator

Calculate fertilizer amounts for gardens, landscapes, acreage, and commercial applications. Scale a rate you already have; the calculator does not invent an application rate.

Examples: 4 lb per 100 sq ft for a garden, or 300 lb per 1 acre for an acreage application. The calculator converts the area units automatically.

About these calculations

Results are mathematical estimates based on the information you enter. Always follow the fertilizer label and your soil-test or local Extension recommendations when available. Soil conditions, nutrient availability, weather, and plant needs vary. Matching nutrient quantities does not mean two fertilizers will perform identically.

Explore NutriHarvest organic fertilizers