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Select an Irrigation Calculator

These irrigation calculators will help compute your irrigation needs based on your growing practices, types of soil, and vegetation.

Popular Calculators

• Drip Line Application Rate: Water application rate of drip irrigation.
• Sprinkler Application Rate: Application rate based on nozzle diameter and spacing.
• Water Application Rate: Water application rate from a given flow and area.
• Nozzle Requirements: Find the flow rate using a given pressure and diameter, or find the nozzle diameter for a given pressure and flow rate.
• Pipeline Size/Pressure Loss: Calculate the pressure loss in a pipe with evenly spaced outlets, such as a sprinkler lateral or a manifold, or minimum pipe size in the same based on the maximum allowable pressure loss.

Irrigation Management Calculators

• Irrigation Frequency: maximum interval allowed between irrigations. This is dependent on soil type, root zone depth, and the water use rate of the crop.
• Set Irrigation Times: set time required to fulfill a given water application, irrigation area, and flow rate.
• Water Depth: Depth of water applied to a specified area over the specified time span based on the given flow rate.
• Water Application Rate: Application rate using the flow rate on an area.

Drip Irrigation Calculators

• Drip Line Rate: Water application rate of drip lines.
• Drip Design for Landscapes: Determine how much water to apply to individual plants with drip emitters.

Sprinkler Irrigation Calculators

• Nozzle Flow Rate and Effective Application Rate: Sprinkler nozzle flow rate and effective application rate based on nozzle diameter and spacing.
• Nozzle Flow Rate and Required Nozzle Diameter: Sprinkler nozzle flow rate and required nozzle diameter based on target application rate and spacing.
• Nozzle Requirements: Find the flow rate using a given pressure and diameter, or find the nozzle diameter for a given pressure and flow rate.
• Lateral Friction Loss: Find the flow rate, pipe length and friction loss based on a sprinkler lateral.
• Hand Move Sprinklers: Find recommended values for hand move sprinklers, such as set times, nozzle and pressure losses.
• Sprinkler Density: Find the number of sprinkler heads per area for rectangular or triangular spacing.
• Traveling Big Gun Sprinkler: Calculate the net water application for a given flow rate, efficiency percentage, lane width, and travel speed.
• Traveling Irrigator: Estimate the the total number of irrigated acres per hour based on lane spacing and travel speed.

Center Pivot Irrigation Calculators

• Percent Timer Setting: Use this calculator to calculate an approximate timer setting to apply a particular depth.
• 1" Application Time: Calculate the irrigation time to apply one inch of water with a center pivot.
• Center Pivot Acreage: Calculate the area underneath a center pivot.
• Pivot Full Rotation Time: The time that it takes for a 360 degree rotation of a center pivot.
• System Pumping Requirements: Calculate the system capacity (flow rate) required to meet the demands of a field.

Residential Irrigation Calculators

• Drip Design for Landscapes: Determine how much water to apply to individual plants with drip emitters.
• Garden Hose Flow Rate Calculate the flow rate and application time for a garden hose, based on hose size and supply pressure.
• Lawn Water Management Find the application depth and operation time for a specific grass type, precipitation rate, and daily water use. Also provides suggested application depths and operation times for multiple water periods.

General Design Calculators

• Irrigatable Area: The land area that can be irrigated with a given flow of water.
• Irrigation Frequency: The maximum interval allowed between irrigations.
• Irrigation Run Time: Determine the length of time that an irrigation system must run to apply enough water to replace the water lost to evapotranspiration.
• Required Water Pump Horsepower: Estimate the brake horsepower and total power (hp) requirements of the electric motor used to power an irrigation water pump.
• Irrigation System Pumping Requirements: Calculate the system capacity (flow rate) required to meet the demands of a field.
• NPSHA: determines the absolute pressure at the pump impeller.
• Total Dynamic Head: This calculator finds the pressure required at the pump, and the head that the pump must generate.
• Minimum Required Pipe Size: Determine required pipe size based on given flow rate, pipe length, material and maximum allowable pressure loss.
• Pipe Velocity and Diameter: Calculate the velocity of water in a pipe and calculate the diameter of a pipe required for 5 fps pipe velocity.
• Pipeline Pressure Loss: Calculates the pressure or friction loss along a given length of pipeline with a specified inside diameter and the minimum pipe size to limit pressure loss to a specified value.
• Pressure Loss from Laterals with Outlets: Calculates friction loss in a pipe with equally spaced outlets and the minimum pipe size for a pipe with equally spaced outlets.
• Fitting Pressure Loss: The equivalent feet of pipe to add to the pressure loss equation.
• Required System Capacity: Calculate the system capacity (flow rate) required to meet the demands of a field.
• Water Application Rate: Water application rate using the flow rate on an area.
• Water Depth: Depth of water applied to a specified area over the specified time span based on the given flow rate onto the field.
• Total Surge Pressure (Water Hammer): Surge pressure due to a sudden shutting of a valve, or water hitting the end of a pipe.
• Water Supply Design: Estimate of the water flow requirements to replace water lost to evapotranspiration.