About this tool
Seedling Batch Calculator
Calculate cells, seeds, trays and seed-starting mix for mixed crop batches using your own germination rates, tray sizes and cell volumes.
Calculation and output
For n seeds per cell and germination probability g, the model estimates at least one germination as 1 − (1 − g)ⁿ. It multiplies that by your usable-seedling fraction, then divides the target plants by that probability and rounds up to whole cells. Trays are rounded separately. Media uses the number of filled cells × filled cell volume, plus your reserve. These are expectations under assumptions, not guaranteed yields.
What is saved
The current settings are stored in this browser when storage is available. Save settings downloads a JSON file; Open settings replaces the current tool settings with that file. These files belong to this specific tool. Clearing browser data removes local settings. No account or cloud synchronization is provided.
Sources and limitations
External references support the specific installation, fabric, seed-starting or print-setting information described in the guides. The calculations and layouts are original tool implementations. No external site has endorsed this tool. Physical output depends on your measurements, materials and equipment; browser checks do not establish physical fit or printer calibration.
Advertising
The layout reserves space for advertising. This release does not load advertisements, ad scripts or tracking analytics. Reserved areas are kept outside tool controls and are excluded from exported files. Advertising, if enabled in a later release, will require an updated privacy notice and any applicable consent controls.
Output and software
Files are generated on your device. Original example artwork and generated surface patterns can be used in personal projects and physical craft items you make. You remain responsible for rights to any artwork you import. PDF generation uses the MIT-licensed pdf-lib library; its license notice is included.