Yield Per Hectare Calculators

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Yield per hectare (t/ha or kg/ha) is the standard measure of crop productivity, expressing the total mass of harvested product produced per unit area. It is the fundamental metric in agronomy, food security analysis, and agricultural policy. Yield depends on genetic potential (variety), weather, soil quality, management inputs (fertilizer, irrigation, pest control), and their interactions. The gap between actual farm yields and maximum attainable yields under optimal conditions — the yield gap — represents the potential for food production increases through better management and technology adoption.

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Calculating Yield Per Hectare

Yield (t/ha) = Total harvest mass (tonnes) / Area harvested (hectares)

Example: 45 tonnes of wheat harvested from a 12-hectare field: yield = 45/12 = 3.75 t/ha. Convert kg/ha to t/ha by dividing by 1000.

World Average Yields for Major Crops (approximate)

  • Wheat: 3.5 t/ha world average; 8–9 t/ha in top-producing regions (UK, Netherlands)
  • Maize (corn): 5.8 t/ha world average; 11–13 t/ha in US Corn Belt
  • Rice (paddy): 4.7 t/ha world average; 6–9 t/ha in Japan, China, California
  • Soybeans: 2.8 t/ha world average; 3.5–4.5 t/ha in top regions
  • Potatoes: 20 t/ha world average; 45–50 t/ha in Netherlands

Factors Affecting Yield

  • Variety/genetics: Modern high-yielding varieties vs. landraces — 3–5× yield potential difference
  • Fertilization: N, P, K application rate closely tracks yield in most systems
  • Water availability: Irrigation can 2–3× dryland yields in semi-arid regions
  • Pest and disease management: Losses from weeds, pathogens, insects can reduce yield by 20–40%
  • Planting density and timing: Optimal plant populations maximize light and nutrient use

Harvest Index

Harvest index (HI) = grain yield / total above-ground biomass. Modern wheat HI ≈ 0.45–0.55; old varieties HI ≈ 0.3. Green Revolution breeding increased HI by developing semi-dwarf varieties that put more biomass into grain rather than straw.

Glossary

Yield Per Hectare (t/ha or kg/ha)
Total harvested product mass divided by area: the standard measure of crop productivity; used in agronomy, food security analysis, and agricultural policy.
Harvest Index (HI)
Economic yield / total above-ground biomass; ~0.45–0.55 for modern cereals; increased by Green Revolution semi-dwarf breeding; determines how much biomass is converted to harvestable product.
Yield Gap
The difference between actual farm yield and attainable yield under best management; represents the potential for production increase without expanding cropland area.

Frequently Asked Questions

Yield per hectare = total harvested mass / area harvested. Units: t/ha (tonnes per hectare) or kg/ha. To convert between units: 1 t/ha = 1000 kg/ha = 892 lb/acre = 14.87 bushels/acre (wheat) — note that the bushel conversion is crop-specific because test weight varies. For small plots in research: multiply yield per plot by the scaling factor to get t/ha. For example, 0.5 kg from a 5 m² plot = 0.5/0.0005 ha = 1000 kg/ha = 1 t/ha.

World average yields: wheat 3.5 t/ha; corn 5.8 t/ha; rice 4.7 t/ha; soybeans 2.8 t/ha; potatoes 20 t/ha. Top national averages are 2–3× higher through intensive management: UK wheat averages 8 t/ha; US corn 11+ t/ha. The yield gap between actual farm yields and what is agronomically achievable with optimal management is typically 20–50% in developed countries and up to 80% in smallholder farming systems in sub-Saharan Africa and South Asia.

Harvest index (HI) = economic yield (grain, fruit, tuber) / total above-ground dry biomass. For grain crops: HI ≈ 0.45–0.55 for modern wheat and rice varieties; ~0.30 for older landraces. The Green Revolution doubled wheat and rice yields largely by increasing HI through semi-dwarf breeding — shorter, stiffer stems that don't lodge and that divert more biomass to grain. HI improvements have largely plateaued, so future yield gains must increasingly come from higher total biomass production.

The yield gap is the difference between actual farm yield and the maximum yield achievable with current best management practices (attainable yield) or under ideal conditions (potential yield). Closing yield gaps — rather than expanding cropland area — is the primary strategy for increasing food production sustainably. In high-income countries, yield gaps are 10–30%; in smallholder systems in Africa and Asia, gaps of 50–80% mean there is enormous scope for improvement through better fertilization, seed quality, pest management, and irrigation.