Vegetable Yield Calculator: Estimate Your Harvest from Any Bed Size

Whether you are planning a kitchen garden from scratch or trying to figure out how many rows of courgettes will feed a family of four, the Vegetable Yield Calculator helps you estimate harvests before you plant. Enter your bed size and the crop you plan to grow, and the tool returns the number of plants that will fit, the expected yield in kilograms, and the approximate harvest duration.

Over 20 vegetable crops are included, spanning roots (carrots, beetroot, parsnips), brassicas (cabbage, kale, broccoli), legumes (peas, French beans, runner beans), salads (lettuce, mixed leaves), and fruiting vegetables (tomatoes, courgettes, cucumbers). Each crop uses specific in-row and between-row spacing, and yield figures account for typical loss from bolting, pest damage, and rejection.

Results include total yield in kilograms, yield per linear metre, approximate plant count, and a harvest season guide. For cut-and-come-again crops like salad leaves and kale, a weekly harvest rate is also shown.

Plant spacing and yield figures are drawn from RHS, Charles Dowding, and AHDB Horticulture guidance. Yields represent garden-scale production under good growing conditions in the UK, with reasonable adjustments for typical pest, disease, and weather losses. Commercial field-scale yields are typically higher due to optimised variety selection, irrigation, and crop protection.

Enter the length of your bed or growing row in metres. Select the crop you plan to grow. If you are choosing between varieties or growing methods, use the optional notes in each crop section to understand spacing assumptions. The calculator will show the number of plants, total expected yield, and harvest timing. Run it for each crop in your rotation plan to see your seasonal production at a glance.