# Seed Tray Planner

Allocate whole trays, cells and seed starting medium.

[Open this tool](https://whatson.pk/gardening-seed-trays-calculator/)

Category: Gardening

Purchased tray capacity and the number of cells you plan to sow are not necessarily equal.

Enter the transplant target, expected losses and tray size. Check medium volume for the cells actually needed.

## Inputs and controls

* Transplants needed (plants). Allowed range: 1 to 1000000
* Expected usable cell share (%). Allowed range: 0.01 to 100
* Cells per tray (cells). Allowed range: 1 to 10000
* Seeds per filled cell (seeds). Allowed range: 1 to 100
* Medium per cell (mL). Allowed range: 0.1 to 10000

## How to use

* Enter transplants needed and expected usable cell share.

* Enter cells per tray, seeds per filled cell and medium per cell.

* Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

The split keeps unused purchased cells from inflating the seed starting medium estimate.


## Before relying on the result

Fills only the cells needed for the expected target, not every purchased tray cell.


## Tool limitations

Fills only the cells needed for the expected target, not every purchased tray cell.

## Questions

### Are all cells in the final tray filled?

Only the cells needed for the expected target are counted as filled. Spare capacity remains visible.

### What should I check before using Seed Tray Planner?

Check Transplants needed, Expected usable cell share, Cells per tray and Seeds per filled cell. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T13:08:12+00:00

This profile describes the tool. It does not execute it or supply a professional certification.