Where Gardening Meets Math
Skip the guesswork. Use simple, proven formulas to plan seed counts, plant spacing, and watering schedules that actually fit your garden.
Garden Planning Tools
Three free calculators built on the same math we write about — plug in your numbers and get a plan.
Seed Calculator
Find exactly how many seeds you need based on bed size, spacing, and germination rate.
Calculate seeds →Plant Spacing Calculator
Get the ideal spacing and total plant count for any plot size and crop.
Calculate spacing →Watering Schedule Calculator
Build a custom watering schedule from your plant type, soil, and season.
Build a schedule →Why Gardening Math?
Every recommendation on this site reduces to a formula you can check yourself.
Precise Planning
Turn bed dimensions into exact seed counts and layouts instead of rough guesses.
Repeatable Formulas
The same handful of formulas apply whether you garden in raised beds, rows, or containers.
Better Timing
Frost dates, days-to-maturity, and evaporation rates combine into schedules you can trust.
Latest Articles
Fresh guides on spacing, seeds, and watering — all grounded in the numbers.
The One Garden Formula Every Beginner Should Learn First
A single area-to-plant-count formula that solves most first-season mistakes.
Read more → Seed MathHow Many Tomato Seeds Do You Really Need?
Germination rate and buffer math for planning your tomato seed order.
Read more → Plant SpacingThe Ultimate Plant Spacing Chart for Vegetable Gardens
A comprehensive reference table of spacing numbers by vegetable.
Read more →Free eBook: “Garden Math Made Simple”
A short, practical guide to the handful of formulas that cover spacing, seed counts, and watering — the same math behind every calculator on this site.
- Garden layout planning with simple geometry
- Plant spacing and seed-count formulas
- Watering budgets for any soil type
“Garden Math Made Simple”
28 pages · PDF · free
What Our Readers Say
“The plant spacing calculator alone saved my raised beds this year — no more overcrowded tomatoes.”
“I recommend the seed calculator to every client starting a vegetable garden from scratch.”
“Finally a watering schedule that accounts for my clay soil. My yields are up this season.”
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