Seed Rate Calculator
Total seed needed for a field at a given sowing rate.
Result
- Total seed
- 1,800 kg
- Bags (25 kg)
- 72
Agriculture & Farming calculators
Seed rate, NPK fertilizer, irrigation flow and silage.
NPK Fertilizer Calculator
Bags of fertilizer to apply N, P, K targets to a field.
Result
- Blend required
- 1,481 kg
- Bags
- 30
Irrigation GPM / LPM Calculator
Required pump flow to deliver an irrigation depth in a given time.
Result
- Total water
- 250 m³
- Flow rate
- 1,042 L/min
- Flow rate (GPM)
- 275
Small Farm Grant Estimator
Estimated annual income from environmental land actions (UK SFI, EU CAP eco-schemes, Countryside Stewardship equivalents).
Result
- Estimated annual grant
- £1,000
- Over 3-year agreement
- £3,000
- Note
- Indicative — confirm current SFI/CS rates on gov.uk before applying.
Crop Nutrient & Fertilizer Mix Calculator
Kilograms of N, P₂O₅ and K₂O required for your field — and the bag count for a chosen NPK blend.
Result
- N required
- 1,200 kg
- P₂O₅ required
- 600 kg
- K₂O required
- 800 kg
- Blend needed
- 8,000 kg → 160 × 50 kg bags
- Applied N / P / K
- 1,600 / 800 / 800 kg
- Deficit / surplus
- N 400, P 200, K 0 kg
- Fertilizer cost
- $4,480
Crop Yield vs. Fertilizer ROI Calculator
Economic optimum nitrogen rate (EONR) and marginal ROI for cereal, oilseed and root crops — models the yield-response curve and stops at the point where the last kg of N no longer pays for itself.
Result
- Economic optimum N rate (EONR)
- 204 kg N/ha
- Predicted yield at EONR
- 9.03 t/ha
- Yield gain over baseline
- 5.03 t/ha
- Extra revenue
- €1,106/ha
- Fertilizer bill
- €255/ha
- Net margin from fertilizing
- €850/ha
- Whole-field margin
- €34,015/yr (40 ha)
Greenhouse Climate & Heating Requirement Calculator
Peak heat loss (kW) and annual heating energy (kWh) for a horticultural greenhouse — sizes the boiler/heater and estimates the fuel bill for glass, twin-wall polycarbonate or single-poly houses.
Result
- Footprint
- 160 m²
- Glazed envelope area
- 323 m²
- Peak heat loss (design night)
- 19.37 kW
- Recommended heater size
- 23.25 kW
- Annual heating demand
- 55,794 kWh/yr
- Annual fuel cost (gas)
- €5,458/yr
- Cost per m² of footprint
- €34/m²/yr