Enter your cultivated area, choose its unit, and select a crop to get an estimated harvest range based on realistic average national yields, from a low to a high scenario.
These are average national yield figures given for guidance only. Your actual harvest depends heavily on the weather during the growing season, soil quality, the exact variety grown, irrigation, and farming practices. This estimate does not replace a professional agronomic assessment.
Why yield estimates need a range, not a single figure
A single average yield figure hides a lot of variation. Two fields growing the same crop in the same country can produce very different harvests depending on the year's weather, the soil, and the variety sown. This tool gives a low, average, and high scenario for each crop instead of one misleading number, so the estimate reflects the real spread seen across a typical growing season.
Average yields used in this estimate (UK, DEFRA)
| Crop | Low (t/ha) | Average (t/ha) | High (t/ha) |
|---|---|---|---|
| Wheat | 6 | 8 | 10 |
| Corn / maize | 7 | 10 | 13 |
| Potato | 30 | 40 | 55 |
| Sunflower | 2 | 2.5 | 3.5 |
| Barley | 5 | 6.5 | 8 |
| Rapeseed / canola | 2.5 | 3.2 | 4 |
| Grape (vine) | 5 | 8 | 12 |
Limits of this calculator
This estimate uses a single national average per crop and does not take into account the specific quality of your soil, the exact weather of the growing season, the variety planted, irrigation, or fertiliser use. Treat the result as an order of magnitude to plan around, not a precise forecast of what a given field will produce. DEFRA publishes updated UK cereal and oilseed yield statistics each year, and actual farm results can sit well outside the ranges shown here in an unusual year.
Wheat and barley yields lead in the UK
The UK benefits from a temperate oceanic climate that consistently produces some of the highest wheat and barley yields in the world, regularly outperforming the global average by a wide margin according to DEFRA's annual cereal statistics. That strength sits alongside a much smaller area devoted to crops like sunflower, which need more sun and heat than most of the UK typically gets. For related planning tools, see the Water Usage Estimator.