Microgreens go from seed to plate in one to two weeks, which makes them ideal for a steady weekly supply, as long as you sow the right number of trays every week.
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Enter how much you want to harvest each week and pick a crop. The calculator works out the trays to sow weekly, the seed per sowing, how many trays are growing at once and the seed to buy for your planning period.
harvest per tray = harvest per full tray × tray size × success % trays per week = ceil(weekly harvest ÷ harvest per tray) seed per week = trays per week × seed per tray trays growing at once = trays per week × ceil(days to harvest ÷ 7)
Sowing a fixed number of trays every week gives an even harvest once the first batch is ready. Crops that take more than a week mean more trays on the shelf at the same time.
For 500 g of sunflower shoots a week, with 400 g per full tray and 90% success, sow 2 trays a week using 360 g of seed. They take 12 days, so 4 trays are growing at once, and 8 weeks need 2.88 kg of seed.
For a 10 × 20 in tray, small seeds like broccoli or radish use roughly 20–30 g (about 1 oz), while large seeds like sunflower and peas use about 150–200 g (5–7 oz).
A full tray typically gives around 200–400 g (7–14 oz) depending on the crop; sunflower and peas are among the heaviest.
Sow the same number of trays on the same day each week for a continuous supply.
Most do not regrow usefully. Pea shoots sometimes give a smaller second cut.