Irrigation Calculators
Crop water requirement, drip system run time and the cost of pumping water.
Irrigation Water Requirement Calculator
Estimate crop water need with ET₀ and crop coefficient, then convert it to litres and pumping hours for your field.
Drip Irrigation Calculator
Calculate drippers, lateral pipe length, system flow and how long to run your drip each day.
Irrigation Cost Calculator
Work out the electricity or diesel cost of pumping irrigation water, per irrigation and for the season.
Irrigation Water Requirement Calculator
Estimate crop water need with ET₀ and crop coefficient, then convert it to litres and pumping hours for your field.
Water is money – measure it
Whether you irrigate from a canal, a tube well or a farm pond, knowing how much water the crop actually needs helps you avoid both stress and waste. Over-irrigation leaches nitrogen, raises pumping bills and can bring up salinity; under-irrigation cuts yield at the stages where it matters most.
- Irrigation Water Requirement Calculator – uses the FAO method (ET0 × crop coefficient) to estimate water need in mm and litres, with pumping time.
- Drip Irrigation Calculator – emitters, lateral length, system flow and how long to run the drip each day.
- Irrigation Cost Calculator – electricity or diesel cost per irrigation and for the season.
A useful rule to remember: 1 mm of water spread over 1 square metre is exactly 1 litre. So 50 mm over one acre (4,047 m²) is about 2,02,000 litres.
Frequently asked questions
Where do I find ET0 values for my area?
Daily reference evapotranspiration (ET0) is published by many state agricultural universities and IMD agro-met advisories. As a rough guide, ET0 in much of India ranges from 3–4 mm/day in winter to 7–9 mm/day in peak summer.