vegetable

Onions Calculators

A bulb crop grown for fresh, storage, and dehydrated markets across diverse US climates. Use the free tools below to plan fertilizer rates, seeding rates, planting dates, yield estimates, and costs for your onions operation.

4 free calculators for onions across 4 categories

Fertilizer & Soil

Onions Fertilizer Calculator

Calculate exact NPK fertilizer rates for onions. Get nitrogen, phosphorus, and potassium recommendations based on yield goals and soil test results.

Seed & Planting

Onions Seeding Rate Calculator

Calculate seeding rate and seed needs for onions. Get population, spacing, and seed quantity recommendations.

Planting Date

Onions Planting Date Calculator

Calculate the optimal planting dates for onions based on your USDA zone, last frost date, and preferred start method.

Crop Yield & Harvest

Onions Yield Calculator

Calculate onions yield per acre. Estimate total harvest, yield potential, and compare to averages.

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