Seed spacing calculator
PROSeed count for a row garden.
Short answer: Rows = ⌊W × 12 ÷ row spacing⌋. Per row = ⌊L × 12 ÷ in-row spacing⌋. 20 × 4 ft bed, 18" rows, 4" in-row = 2 × 60 = 120 seeds. Enter your measurements above and the seed spacing calculator returns the quantity, unit conversions and an estimated cost instantly, in imperial or metric — no sign-up needed.
What do you need to measure?
What is the answer?
Rows
3
Seeds per row
60
Total seeds
180
How does the seed spacing calculator work?
Rows = ⌊W × 12 ÷ row spacing⌋. Per row = ⌊L × 12 ÷ in-row spacing⌋.
What does a worked example look like?
20 × 4 ft bed, 18" rows, 4" in-row = 2 × 60 = 120 seeds.
What do people ask most?
›Wide rows?
Wide rows (2–3 ft) yield more per foot of bed than single rows.
Which garden calculator should you use next?
Where can you learn more?
Read field notes on estimating and materials, or browse every calculator we make.