Aquifer Drawdown Calculator
Calculate aquifer drawdown from pumping rate and specific capacity. Estimate water level decline during irrigation pumping to plan operations.
Free Water Calculators
14 toolsWater management and pump sizing calculators. Browse our free water tools below — no sign-up required.
Crop Evapotranspiration (ETc) Calculator
Calculate crop evapotranspiration ETc by multiplying reference ET₀ by the crop coefficient Kc. Determine daily water use by growth stage.
Energy Cost of Pumping Calculator
Calculate the energy cost to pump irrigation water from GPM, total dynamic head, pump efficiency, motor efficiency, run hours, and electricity rate.
Pond Evaporation Loss Calculator
Calculate monthly or annual pond evaporation loss from surface area, pan evaporation rate, and pan coefficient. Plan water budgets accurately.
Pond Storage Volume Calculator
Calculate farm pond storage volume using the frustum formula from surface area, bottom area, and depth. Convert to acre-feet and gallons.
Pump Flow Rate (GPM) Calculator
Calculate the required pump flow rate in GPM from irrigated acres, application depth, and available pumping hours. Size your irrigation pump correctly.
Pump Horsepower Calculator
Calculate water horsepower and brake horsepower for irrigation pumps from GPM, TDH, and pump efficiency. Size your motor correctly.
Pump Total Dynamic Head Calculator
Calculate total dynamic head (TDH) for an irrigation pump by summing pumping lift, friction loss, and operating pressure. Essential for pump selection.
Rain Gauge to Inches Converter
Convert rain gauge volume readings to rainfall depth in inches. Supports standard 4-inch and 8-inch gauges and custom gauge diameters.
Rainwater Harvesting Calculator
Calculate rainwater capture volume from roof area, annual rainfall, and collection efficiency. Size cisterns and plan water storage for farm use.
Reference Evapotranspiration (ET₀) Calculator
Estimate reference evapotranspiration ET₀ using a simplified Penman-Monteith approach. Input weather data to calculate daily ET₀ in inches.
Water Rights Acre-Feet Calculator
Calculate water rights allocation usage as a percentage of permitted acre-feet. Track cumulative pumping against annual water right permits.
Water Use Efficiency (WUE) Calculator
Calculate water use efficiency as crop yield per unit of water applied. Compare WUE across crops, seasons, and irrigation methods in bu/ac-in.
Well Yield Calculator
Calculate well yield in GPM from a pumping test using volume pumped and elapsed time. Determine sustainable yield for irrigation planning.