Farm & Garden Calculators

Practical calculators for US growers, in the units you actually use: acres, feet, pounds, bushels, and Fahrenheit. Each tool runs in your browser and shows the math behind the answer. 8 calculators.

Land & Planting

Plants Per Acre Find how many plants fit in an acre from your row and in-row spacing. Acreage & Area Convert a field length and width into acres, square feet, and hectares. Seeding Rate Scale a per-acre seeding rate to your field and get seeds per foot of row.

Weather & Season

Growing Degree Days Calculate daily and accumulated growing degree days in Fahrenheit.

Soil & Nutrients

Fertilizer Rate Turn a target pounds-of-nitrogen goal into pounds of fertilizer to spread. Compost & Mulch Work out the cubic yards of compost or mulch to cover a bed at a set depth.

Livestock & Feed

Hay & Feed Estimate daily hay use and the number of bales a herd needs for a season.

Storage & Yield

Grain Bin Capacity Estimate the bushels of grain a round bin holds from its diameter and depth.

These calculators are general planning tools. Local conditions, soil tests, and your Cooperative Extension office should guide real-world rates and decisions.