Seeding Rate Calculator AGRI TOOLS
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Seeding Rate Calculator (Row Spacing, Plant Spacing, Germination)

Calculate required seed count and seeding rate from row spacing, plant spacing, germination, or direct target stand input.

Switch between spacing mode and direct target stand mode
See germination sensitivity at ±10 points in the same view
Convert into weight from thousand-seed weight or seeds per weight unit
Estimate bags, copy share URL, print, and restore previous values

How to use

  1. Choose area, length, and weight units. Values are converted automatically when you switch units.
  2. Select the seeding method and choose either spacing mode or direct target stand mode.
  3. Enter germination rate and expected missing plants to update required seed count instantly.
  4. Add thousand-seed weight, seeds per weight unit, bag weight, target area, or reserve only when needed.
  5. Review the result cards, breakdown, and sensitivity table, then share the output by copy or share URL.

Sample cases

Check seeding rate from 30 cm x 10 cm spacing

Input: Row spacing 30 cm, plant spacing 10 cm, germination 90%, missing 5%, thousand-seed weight 45 g, bag weight 20 kg

Output: Required seeds 389,864 seeds/ha, required weight 17.54 kg/ha, bags 0.88 bags/ha, purchase guide 1 bag

Use direct target stand when plant spacing is unknown

Input: Target stand 30 plants/m², germination 85%, missing 10%, 22,000 seeds/kg, bag weight 20 kg, target area 3 ha, reserve 5%

Output: Required seeds 411,765 seeds/ha, required weight 18.72 kg/ha, total for target area 56.15 kg, purchase guide 3 bags

Glossary

Row spacing
The center-to-center distance between adjacent rows.
In-row spacing
The distance between neighboring plants or seed drop points within the same row.
Expected missing plants
The expected share of plants that will be lost after emergence and before establishment.
Thousand-seed weight
The weight of 1,000 seeds, used to convert seed count into weight.

Formulas

Internal calculations stay in meters, square meters, and kilograms. Units change only at display time.

  • Target stand N = 1 / (row spacing × plant spacing)
  • Effective establishment E = germination × (1 - missing plants)
  • Required seeds = target stand / E × (1 + reserve)
  • Required weight (kg) = seed count × thousand-seed weight / 1,000,000
  • Bags = required weight / bag weight

Notice

  • Results can change widely by variety, seed quality, planter accuracy, soil moisture, pests, and bird damage.
  • Use this tool as a planning and comparison guide, then adjust with local recommendations and field conditions.
  • If a seed bag or manufacturer sheet gives a spec value, follow that value first.

Frequently asked questions

I do not know the germination rate.

You can enter an estimate. The tool also shows results with germination moved by ±10 points, so you can compare uncertain cases quickly.

I need the answer in bags.

Enter bag weight and the tool will calculate both fractional bags and the rounded purchase guide.

Can I switch units?

Yes. You can switch ha / acre, cm / in, and kg / lb. The current input values are converted automatically.

I do not know the thousand-seed weight.

You can still calculate required seed count without it. Enter seed weight data only when you need weight output.

I do not know plant spacing for drill seeding.

Switch to direct target stand mode and calculate without plant spacing.

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