Seed Germination Calculator
Test germination rates and plan how many seeds to sow.
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Tools & Calculators
Every tool in one place. Search or pick a category, then start doing the math.
Seeds & Propagation — 14 calculators
New New Potting Soil Calculator
Liters and bags of potting mix for any number of pots.
Use ToolNew Plants Per Square Foot
Square-foot gardening plant counts for any bed size.
Use ToolNew Microgreen Tray Calculator
Seed per tray, expected yield and cost per pound for a microgreen grow.
Use ToolNew Seed Garlic Calculator
Pounds of seed garlic, cloves and bed size for your fall planting.
Use ToolNew Potato Seed Calculator
Pounds of seed potatoes, cut pieces and estimated harvest for your row feet.
Use ToolNew Flower Bulb Spacing Calculator
How many spring bulbs to buy for a bed, by bulb type, area and pack size.
Use ToolNew Seed Packet Coverage Calculator
How many seed packets to buy for a row length, by crop, with cost and seed count.
Use ToolNew Direct Seeding Row Length Calculator
Seeds to sow for your row length by crop, how many feet one packet covers, and the packets and cost to buy.
Use ToolNew Plug Tray Calculator
Cells to sow and plug trays to buy for your target transplants, adjusted for germination, plus tray cost.
Use ToolNew Seed Starting Date Calculator
Counts back from your last frost date through indoor weeks and hardening off to the date to sow each crop indoors.
Use ToolNew Transplant Date Calculator
Dates the move: crop-specific offset from last frost gives transplant and hardening days plus seedling age at setting.
Use ToolNew Heat Mat Germination Calculator
Days to sprouts by crop and soil temperature band, plus the germination date, mat wattage and the electricity cost of the run.
Use ToolNew Seed Vault Storage Life Calculator
Estimate how long saved seed keeps from storage temperature and humidity, then plan germination rate, seeding density and a replant year.
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