Seed Propagation Planner
Work backwards from desired plants to seeds, packets, trays and growing-medium volume, allowing for germination and transplant losses.
- 1List your crops
- 2Read the answer as you type
- 3Download or print it
Loading the worked example…
Assumptions
Results update as you type. Example figures are illustrative.
Your working data
Edit cells directly or import a CSV. Download “Input CSV” for the required column names. Up to 200 rows; scroll the table sideways for additional fields.
Detailed analysis
Exports include all results, regardless of the search filter. The HTML report includes assumptions and source data; use your browser’s Print command for PDF.
Chart shows the first 20 rows; negative values use a warm color. Click table headers to sort.
Compare up to four scenarios
Capture the current inputs, change assumptions and capture again. Scenarios are included in downloaded projects.
What this model includes
Independent average loss assumptions, not a guaranteed plant count. Each crop gets its own rounded trays; this model does not mix crops within a tray.
Import and save safely
CSV imports use your current assumptions. Project files restore assumptions, rows and saved scenarios. No automatic saving: download a project before closing this page. Imports are limited to 10 MiB and 200 rows. Calculations run in your browser; the site’s advertising and analytics follow its privacy policy.
Using Seed Propagation Planner
Work backwards from desired plants to seeds, packets, trays and growing-medium volume, allowing for germination and transplant losses.
- Set cells per tray and any extra seed allowance.
- List each crop with target plants, germination, survival, packet size, price and medium.
- Read your shopping list beside your table, then download it.
Example
The worked example includes Tomato, Lettuce, Pepper. Change the first cells per tray setting and compare the result with a saved baseline.
Questions & answers
What does Seed Propagation Planner calculate?
Work backwards from desired plants to seeds, packets, trays and growing-medium volume, allowing for germination and transplant losses.
What are the important limitations?
Independent average loss assumptions, not a guaranteed plant count. Each crop gets its own rounded trays; this model does not mix crops within a tray.
Can I continue my work later?
Yes. Save a project JSON file and reopen it with Import CSV / project. It contains the working data, assumptions and up to four scenarios. Nothing is saved automatically.
What CSV columns do I need?
crop, plants, germination, survival, packet, price, cell. Download Input CSV for a compatible example. CSV imports keep your current assumptions.
Are these example figures current industry benchmarks?
No. They are illustrative values to demonstrate the model. Replace them with figures appropriate to your situation.
Related tools
A useful next step for your task.
Everyday CalculatorsSeasonal Garden CalendarCreate crop-specific sowing, transplant and estimated harvest dates from your chosen seasonal anchor and succession intervals.
Everyday CalculatorsSeed Spacing Grid PlannerEstimate planting positions on an evenly spaced rectangular grid.
Everyday CalculatorsGarden Bed Soil CalculatorEstimate soil volume for a rectangular raised bed and bags to buy.
Everyday Calculators2026 Tax Refund EstimatorEstimate your 2026 federal income tax refund or balance due with the new IRS brackets, standard deduction, tips, overtime, car-loan and senior…
Help improve this tool
Report a problem or suggest an improvement
Describe the issue without pasting private tool input. Feedback goes to our admin inbox.