What size raised bed is best for vegetables?

1.2m wide is ideal so you can reach the centre from both sides without stepping on the soil. Lengths of 1.8m, 2.4m, or 3.6m are most popular.

How deep should a raised bed be for vegetables?

At least 200mm for salads, 300mm for roots like carrots and beetroot, and 450mm+ if placing on concrete or poor ground.

Yes. Use companion planting principles - grow compatible crops together. Avoid planting the same crop family in the same bed two years running.

A good mix is 60% topsoil, 30% compost, and 10% perlite or grit for drainage. Avoid using 100% compost as it compacts over time.

Better drainage, warmer soil in spring, no compaction from walking, easier to manage soil quality, and better access for those with mobility issues.

GardenCalcs.uk

Plan what to grow in a raised bed with spacing and yield estimates.

Bed Length

Longest side of the bed — 1.8m, 2.4m and 3.6m are the common kit sizes

Bed Width

1.2m lets you reach the centre from both sides without treading on the soil

Crop to GrowPick a crop to estimate plant spacing, quantity and expected harvest weight

Bed area = Length × Width. Plant count = Area × Plants per m² for the chosen crop.

Yield estimates are based on average UK growing conditions with recommended spacing for raised bed growing.

Raised beds often produce higher yields than open ground because of better soil, drainage, and less compaction.

Plan crop rotation across garden beds to maintain soil health and reduce disease.

Plan your planting calendar based on last and first frost dates for common vegetable crops.

Work out how big a veg plot you need to feed your family.

Estimate harvest yields for common vegetables based on growing area.

Plan crop rotations and plot layouts for allotment gardening.

Last updated: February 2026

All calculations are estimates based on standard gardening guidelines. Results may vary with soil conditions, climate, and plant varieties.