Chilli Water Requirement Calculator
Work out the seasonal and per-irrigation water requirement of chilli (FAO-56 ETc = ET₀ × Kc, peak Kc 1.05) for your field, climate, soil and irrigation method.
Even moisture through flowering and fruiting prevents flower and fruit drop; drip is excellent. Avoid waterlogging, which invites wilt and root rot. Slight stress before a flush can synchronise flowering.
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 Chilli Water Requirement Calculator to turn the FAO-56 crop coefficients for chilli into a real seasonal water volume and an irrigation interval for their own field — no agronomy tables, works offline.
About Chilli Water Requirement Calculator
Chilli needs 500–700 mm and drops its flowers if it dries out or drowns during the long, flush-by-flush fruiting period. This calculator uses the FAO-56 method — crop evapotranspiration ETc = ET₀ × Kc — with chilli's own crop coefficients (Kc 0.6 initial, 1.05 mid-season, 0.9 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 Chilli 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 Chilli Water Requirement Calculator?
- ✓Uses chilli'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 chilli need?+
Chilli needs 500–700 mm and drops its flowers if it dries out or drowns during the long, flush-by-flush fruiting period. 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.
Why is my chilli dropping flowers?+
Moisture stress (or sudden flooding) plus heat is the usual cause of flower drop in chilli. Keeping soil moisture even with frequent drip irrigation through the flowering flushes is the main prevention.
How much water does a chilli crop need?+
About 500–700 mm over the season for irrigated chilli, peaking through fruiting. The tool converts ET0 × Kc to your field's seasonal and per-irrigation volume by climate, soil and method.
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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