When to use this calculator
Plan seed count when both germination and later survival losses are entered. Both percentages are assumptions; losses may be correlated rather than independent.
Explore the plant spacing, soil & seed calculators for other questions in this topic. For a related calculation, use the Tapered Planter Soil Calculator: Estimate soil fill volume for a tapered round plant pot.
PUTTING IT INTO PRACTICE
Seed Survival Adjustment: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Target surviving plants (integer) | 72 |
| Germination (%) | 80 |
| Post-germination survival (%) | 90 |
| Result | 100 seeds |
- Check the input labels and enter the example values above.
- Apply the relationship: Seeds = ceiling(target/(germination × later survival)).
- The result is 100 seeds, rounded for display.
How to interpret your result
Both percentages are assumptions; losses may be correlated rather than independent.
Usable area and boundaries affect actual plant count. Product-specific seed rates and germination assumptions are entered rather than recommended. Volume-based soil estimates can change with settling, moisture and compaction.
Frequently asked questions
Does a plant-count estimate choose suitable crop spacing?
No. You choose spacing appropriate to the crop and growing conditions. The calculator translates that spacing into a geometric count.
When is the seed survival adjustment calculator useful?
Plan seed count when both germination and later survival losses are entered. Both percentages are assumptions; losses may be correlated rather than independent.
How do I use the seed survival adjustment calculator?
Enter target surviving plants (integer), germination (%), post-germination survival (%). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Seeds = ceiling(target/(germination × later survival)).
What should I check before using the result?
Both percentages are assumptions; losses may be correlated rather than independent.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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