Microgreens Seed Calculator – Find the Perfect Seeding Density

Home Microgreens Seed Calculator

Use this Home Microgreens seed calculator to determine the perfect seeding density for your microgreen trays. 

We've covered aspects of microgreen seed density and calculating the perfect seed density in several articles, see below for links to those articles.

The reason for multiple articles is because seeding density is vital for both commercial and home microgreen growers.

In this article, as you can imagine by the name of this website, we concentrate on the microgreen tray seeding density for home microgreen growers. 

Below is an interactive web microgreens seed calculator you can use to determine how many grams of microgreen seeds you need for your trays. There are over 20 varieties of microgreens listed and more will be added.

To go directly to the Home Microgreens Calculator click here.

why microgreen seed density is important

Methods to Calculate Microgreen Seed Density

Below are the iterations used to reach the creation of the microgreens seed calculator presented below.

At first, we tried to use the rather gross reported weights and volumes used by commercial growers to plant their 10- by 20-inch trays. 

We found that the seeding densities used by commercial growers - those growing microgreens to sell to restaurants, stores, and farmers markets - were much too dense for the smaller trays most home microgreen growers would use. 

In our opinion, the plants were so tight that they fought for light and those in the middle of the tray didn't develop to efficiently convert light energy to maximize their nutrition.

Commercial growers obviously want to produce a nutritious product. But they also want to maximize the weight of harvested greens. Home growers on the other hand can give up a bit of yield for more nutritious and flavorful greens.

But all we had to go on were the seed weights (or volumes) used by commercial growers, so we went with it and modified as we tested.

We also found that several wholesale microgreen websites estimate how many seeds are in a pound. Using averages of these estimates we now know how many seeds are planted on tray. Dividing this number by the area of the tray gives us how many seeds are ideally grown per square-inch of space on the tray. 

This allows us to calculate how many seeds (and thus weight of seeds) are ideal for the perfect seeding density regardless of the tray area.

You can read more about that method and also get a free chart listing the number of seeds per gram for a wide variety of microgreens.

Sowing MicroGreen Trays With a Consistent Seeding Density

Trial and Experimentation with Microgreen Seeds

Using the method explained above and then planting and growing tray after tray of microgreens we have narrowed down what we believe to be the correct seeding density for the Home Microgreens Store trays.

In the associated article, we explain more on why microgreen seeding density is essential. There are a couple of web-interface calculators to help you calculate how much seed you need for microgreen tray sizes that are not equivalent to the Home Microgreens Store tray. 

These calculators might be obsolete with the creation of the calculator presented below and additional purchase options in the Home Microgreen Store. However, the content in the article is beneficial.

Click the link or button below to read the article.

Calculating Microgreen Seed Density For Your Planting Trays

Home Microgreen Seed Calculator

Below is the Microgreen Seed Calculator. Most likely it will be obvious how to use the calculator, but below we explain how to use it and how the calculations are derived.

The Home Microgreens Calculator uses the dimensions of your tray and converts it to the surface area.

Then the algorithm uses the data collected in our planting trials and experiments to calculate how many grams of microgreen seed you'll need to sow in your planting tray.

Using the Home Microgreen Seed Calculator

First, measure the average length and width of the microgreen tray you are going to plant (in inches).

Important Step

Don't necessarily measure the edges of the tray, but rather, the extent of the soil in the tray. You want to calculate the surface area of plantable soil in the tray. 

Then adjust the slider bars on the calculator to the plantable dimensions of your tray. The bars move in quarter-inch intervals.

You'll notice that values under each of the microgreen varieties below the sliders will change as the sliders move.

The value presented under each of the microgreen varieties is the mass of seed in grams you should plant in your microgreen tray. 

Much Easier Way to Calculate Seeding Density

As you can see that is a much easier way to calculate how much seed you need for each of your trays.

You can now buy several varieties of microgreen seeds by the ounce in the Home Microgreens Store.

Use the seed calculator above then go to the Home Microgreens Store and purchase the amount of seed you need for your trays.

home microgreens

Home Microgreens Store

All the supplies and microgreen seeds you need to grow beautiful and nutritious microgreens at home!

Our prices are as competitive as the larger seed sellers. We also have our own soil, microgreen kits, and trays!

Have a Question?

If you have any questions about the information in this post or microgreens, in general, please leave a comment below or reach out to me using the Ask a Question page

Leaving a comment or using the Ask a Question page does not add your email to any mailing or marketing list. 

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Author of this Article is Todd

Todd is the founder of Home Microgreens & the Home Microgreens store. He also writes for several other websites, including MakeGardeningEasy.com. Todd worked at a large farm market, garden & nursery center for 20-years. Somehow he snuck off to become a geologist and professor before coming back to his senses to write & lecture about microgreens and gardening. When not at the computer, he can be found in the garden, trout stream, or mountain trail with his new Springer Spaniel Caden.

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  • Is your microgreen seed calculator considering germination rate by percentage? I have been reading the germination rate on my seed packages which I consider when I plant them.

    • Thanks for your question. The calculation is based on a 90% germination rate.

  • Dominic Carpin says:

    I love the seed density calculator. Some of the recommended amounts seem surprisingly low. I like the idea of being conservative with seed as it can be one of the highest costs portray. Your recommendation for peas seems rather High. I’ve gotten away with a quarter pound in the past with great results. But that was using dwarf grey sugar

    • Thank you!
      Remember the calculator is a place to start. It should get you close depending on your growing conditions and grow media. It isn’t as accurate with larger trays as smaller trays. But again, it’s a place to start.
      Yes, some weights are low, but those are for the microgreens that have larger leaves or should be grown longer. For peas and sunflowers, the amount is what fits in the Home Microgreens Tray. For 1020 trays I use 9.8-ounces for peas and 4.8-ounces for sunflowers. But again, it depends on the seed as each seed lot is a different size and density. The seed calculator is again, only a guide.

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    Home Microgreens Also Offers the Following

    Microgreen eBook

    A comprehensive microgreen ebook that details the principals of growing microgreens at home. Several different methods and processes are detailed.

    The ebook comes in two versions, one version includes instructions to grow the most commonly grown microgreens. The second includes access the microgreen vault, a database containing more varieties and information with images taken throughout the stages of growth.

    Video Courses for the Home Grower

    The Home Microgreens Video Course is perfect for the person that wants to grow one or more trays of microgreens for home use. Trays of microgreens also make great gifts! 

    The course includes short, easy to follow videos and checklist for each step along the way.

    Step-by-step video instructions are included for the most commonly grown microgreen varieties. 

    Grow for Profit Course

    Do you want to learn how to grow microgreens for profit? Grow microgreens as a side hustle, retirement income, or maybe even as an occupation. 

    It's possible to earn a few hundred to thousands of dollars a month. 

    The Grow for Profit Video Course shows you what is involved to set up a microgreens business, how to setup your grow area, and instructions on how to grow many different varieties. 

    The Home Microgreens Store

    The Home Microgreen Store has all the supplies you need to grow microgreens at home. 

    We stock complete microgreen kits, trays, professional potting soil, miscellaneous equipment and of course microgreens seeds.

    Microgreen kits make great gifts, home school or rainy day projects, and are fun for the whole family.

    Instructions are included as well as email support.

    Our kit and seed prices are very competitive if not the lowest on the internet.