Wheat Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of wheat (FAO-56 ETc = ET₀ × Kc, peak Kc 1.15) for your field, climate, soil and irrigation method.
The first irrigation at crown-root initiation (~21 days) and the one at flowering are non-negotiable — missing either costs more yield than any other. In light soils irrigate more often at lower depths.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Farmers and irrigation planners use the free Wheat Water Requirement Calculator to turn the FAO-56 crop coefficients for wheat into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Wheat Water Requirement Calculator
Irrigated wheat needs roughly 400–500 mm over the season, with the crown-root-initiation and flowering irrigations being the most critical. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with wheat's own crop coefficients (Kc 0.4 initial, 1.15 mid-season, 0.4 late) across a 135-day season. Pick your climate band (which sets reference ET₀), irrigation method (drip, sprinkler, pivot or surface — each with its own efficiency) and soil texture, and it returns the seasonal water need in cubic metres, the peak daily demand, the net depth per irrigation and how many days to wait between irrigations.
How to use Wheat Water Requirement Calculator
- 1Enter your field area and choose the climate band matching your season.
- 2Select your irrigation method and soil texture.
- 3Read the seasonal water volume, peak daily demand and irrigation interval, then follow the scheduling note.
Why use Wheat Water Requirement Calculator?
- ✓Uses wheat's real FAO-56 Kc curve, not a flat factor
- ✓Accounts for drip / sprinkler / pivot / surface efficiency
- ✓Gives seasonal volume, peak daily need and an irrigation interval
- ✓Free, instant and fully in-browser — works offline in the field
Frequently asked questions
How much water does wheat need?+
Irrigated wheat needs roughly 400–500 mm over the season, with the crown-root-initiation and flowering irrigations being the most critical. The exact figure depends on climate and season length; this tool sums ET₀ × Kc across the crop's 135-day growth stages for your conditions.
How many irrigations does wheat need?+
Typically 4–6 in north India: crown-root initiation (~21 days), tillering, jointing, flowering, milk and dough stages. Crown-root and flowering are the most yield-critical; skip the late ones first if water is short.
What is the total water requirement of wheat?+
About 400–500 mm for a full irrigated crop, depending on climate and season length. This tool sums ET0 × Kc across the crop's growth stages for your conditions and converts it to cubic metres for your field.
What is ET₀ and Kc?+
ET₀ (reference evapotranspiration) is how fast a standard grass surface loses water in your climate. Kc (crop coefficient) scales it to a specific crop and growth stage. Crop water use ETc = ET₀ × Kc — the basis of FAO-56 irrigation scheduling.
Is this calculator free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline in the field and your data never leaves the device.
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