Categories: Flowers & PerennialsVegetable & Fruit Gardening

Free Seed Starting Calculator and Garden Planting Calculator

Starting broccoli seeds indoors over winter.

A free seed starting calculator for when to start seeds indoors, a calculator to learn when to set out your seedlings, and a seed quantity calculator to determine how much seed you need for your garden are some of the free online gardening tools at the Johnny’s Selected Seeds website. Every gardener will find these charts and calculators incredibly useful, whether you’re planting one garden bed or a field.

Seed Quantity Calculator

Whether you’re a farmer or a novice home gardener, this calculator will tell you how many transplants or seeds to plant in each row. You choose the crop and the length of your row, click on “calculate” and voila! The correct number of seeds or transplants you’ll require appears. It also has a second calculator for larger plots and multiple rows. See the seed quantity calculator.

[su_highlight background=”#fffcba”]Click here for a free guide on planning and planting your fall garden harvest.[/su_highlight]

Seed Starting Date Calculator

I absolutely love this one. At the top of the calculator, enter the potential last frost date for your hardiness zone – in my case here in zone 6, it’s May 15. The calculator then compiles the indoor seed starting date for the most common vegetables, flowers and fruits, and the “safe” date to set those seedlings in your garden. See the seed starting calculator by date. If you don’t know your last frost date, check our last frost date guide.

Johnny’s Seeds has also added how-to videos, a Fall planting calculator, and a few other things you might find useful.

[su_highlight background=”#fffcba”]Learn how to start garden seeds indoors.[/su_highlight]

Todd Heft

Todd Heft is a lifelong gardener and the publisher of Big Blog of Gardening. He lives in the Lehigh Valley, PA with his wife who cooks amazing things with the organic fruits, vegetables, and herbs he grows. When he isn't writing or reading about organic gardening, he's gardening. His book, Homegrown Tomatoes: The Step-By-Step Guide To Growing Delicious Organic Tomatoes In Your Garden is available on Amazon.