Crop Yield Calculator

Estimate crop yields for common vegetables and commercial crops. Calculate value of harvest.

Last updated: April 2026 · Source: Defra — Cereal and oilseed production statistics

Expected Yield

80 kg

Yield per m²

4 kg

Estimated Value

£120.00

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

UK crop yields vary by crop type, soil quality, region, weather and farming practices. Average yields in recent years: winter wheat 8.0–8.5 t/ha, winter barley 6.5–7.0 t/ha, spring barley 5.5–6.0 t/ha, oilseed rape 3.0–3.5 t/ha and potatoes 40–45 t/ha. These figures come from Defra's annual harvest reports.

This calculator estimates total yield and gross output value based on your field area, crop type and expected yield per hectare. You can adjust the yield figure to reflect your farm's historical performance or local conditions. It also shows the gross margin when you enter your variable costs per hectare.

Yield is affected by many factors including seed variety, sowing date, soil type, rainfall, fertiliser regime and pest/disease pressure. The calculator uses national averages as a baseline, which you can adjust upward or downward based on your own situation.

Example: 50 hectares of winter wheat

  1. Area: 50 ha
  2. Expected yield: 8.2 t/ha
  3. Total harvest: 410 tonnes
  4. Price at £200/t: gross output = £82,000
  5. Variable costs at £650/ha: £32,500 → gross margin = £49,500

Source: Defra — Cereal and oilseed production statistics

Frequently Asked Questions

What does the Crop Yield Calculator do?
Estimate crop yields for common vegetables and commercial crops. Calculate value of harvest. All calculations are performed in your browser using official UK rates and thresholds.
Are these based on Defra rates?
Where applicable, this calculator uses rates and data from Defra, the Rural Payments Agency and industry standard references for UK agriculture.
Does this account for regional variations?
UK farming conditions vary by region, soil type and climate. This calculator provides national average figures — adjust for your specific location and circumstances.