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Calcimator

Seed Rate Calculator

Calculate pounds of seed per acre based on crop type, row spacing, target plant population, and germination rate.

Inputs

in
K seeds/acre
%
acres

Results

Seed Rate

24.68 lbs/acre

Total Seed Needed3,949.18 lbs
50-lb Bags Needed79
Seeds per Foot of Row2.1
Seeds per Acre (adjusted)35,789
How to Use This Calculator
  1. Select the crop type (corn, soybean, or wheat) and enter your target plant population per acre.
  2. Enter the row spacing in inches and the germination rate from the seed tag.
  3. Enter the field size in acres to get total seed needed for the whole field.
  4. Review the seed rate in pounds per acre, along with total pounds needed and 50-lb bags needed.
  5. Check the seeds-per-foot-of-row and adjusted seeds-per-acre figures to fine-tune planter settings.

How the result changes with Germination Rate

Germination RateSeed Rate
55%42.63 lbs/acre
68%34.48 lbs/acre
83%28.25 lbs/acre
95%24.68 lbs/acre

What each input means

Crop Type
Select crop: 1 = Corn (~1,450 seeds/lb), 2 = Soybean (~2,500 seeds/lb), 3 = Wheat (~12,000 seeds/lb).
Row Spacing
Distance between rows in inches. Corn/soybean: 30 in typical; wheat: 7.5 in typical.
Target Population
Desired plant population in thousands per acre. Corn: 32-36K; soybean: 120-140K; wheat: 1,200-1,600K.
Germination Rate
Seed germination percentage from the seed tag. Typically 90-98%.
Field Size
Total field area in acres to calculate total seed needed.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Crop Type = 1, Row Spacing = 30, Target Population = 34, Germination Rate = 95 = 5 input(s) provided
  2. Calculate Seed Rate
    24.68 = 24.68
  3. Calculate Total Seed Needed
    Total Seed Needed
    3949.18 = 3949.18
  4. Calculate 50-lb Bags Needed
    50-lb Bags Needed
    79 = 79

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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