Seed Spacing and Yield Calculator

The seed spacing and yield calculator converts a garden bed's dimensions and a vegetable's recommended spacing into a plant count and a harvest estimate. Spacing figures for more than 30 vegetables come from university agricultural extension recommendations for intensive raised bed gardening, the same data behind published spacing charts.

Bed width and length accept decimals (3.5), fractions (7/2), and mixed numbers (3 1/2), in feet or meters. The imperial unit system reports spacing in feet and inches and yield in pounds; the metric system reports spacing in meters and centimeters and yield in kilograms.

Succession planting means sowing the same crop in staggered batches a few weeks apart so the harvest spreads out over the season instead of arriving all at once. A succession interval, set in weeks, divides the growing window into that many separate plantings and totals the projected yield across all of them. Settings also holds a step-by-step formula display and a custom yield-per-plant value that overrides the built-in default.

Number of rows equals bed width divided by row spacing, rounded down to the nearest whole row. Plants per row equals bed length divided by plant spacing, rounded down. Total plants is rows multiplied by plants per row, and estimated yield is total plants multiplied by yield per plant. Succession planting divides the available growing window by the chosen interval to determine how many rounds of planting fit into one season.

Garden layout planning depends on knowing how many plants a bed actually holds and how much food that translates into. Extension-recommended spacing turns bed size and crop choice into plant counts and harvest estimates for a family garden, a community plot, or an intensive planting method.

• Home Gardeners: A raised bed's dimensions translate directly into how many tomato, lettuce, or pepper plants will fit, and yield estimates compared across vegetables help decide what to grow for the season.
• Square Foot Gardening: Intensive spacing methods can be checked against extension-recommended plant counts: a 4 x 4 foot bed compared across vegetables shows which mix fits the most variety into the space.
• Succession Planting: Staggering plantings of fast-maturing crops like radishes or lettuce every two to three weeks produces a total seasonal yield built from several harvests rather than one.
• Community Gardens: Plot managers can estimate total production across multiple beds and plan crop assignments for participants based on expected yield per bed.
• Market Gardeners: Plant counts and expected pounds of produce per bed translate into revenue potential for farmers market sales or CSA box programs.
• Education: Teachers and agricultural extension educators can demonstrate spacing principles and yield estimation in classroom or workshop settings.
• Seed Purchasing: Total plant count across all beds, tallied before the growing season begins, sets how many seeds or transplants to order.