🌾 Seed Starting Supply Calculator

Estimate supplies and cost to start seeds indoors — trays, heat mats, grow lights, and soil mix.

Project Details

Number of Varieties (types)

Cells per Variety (cells)

6-12 cells per variety gives room for thinning

Grow Light? (0=no, 1=yes)

Heat Mat? (0=no, 1=yes)

Speeds germination for peppers, tomatoes, herbs

Your Estimate

Enter your details and hit Calculate to see results.

More Tools You Might Need

Seed Trays with Domes

Humidity dome speeds germination

Warms soil to speed germination

Essential if you don't have a sunny south window

Seed Starting Mix

Lighter than potting soil — better for tiny roots

Track what you planted where

Water seedlings gently without disturbing roots

Pro Tips

✓ Start seeds 6-8 weeks before your last frost date
✓ Bottom watering prevents damping off — set trays in water and let soil wick up
✓ Harden off seedlings by putting them outside for increasing hours over 7-10 days
✓ Most seeds germinate best at 70-80°F soil temperature

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