Water need estimators. Browse our free irrigation tools below — all calculators are instant, accurate, and require no sign-up.
Border Irrigation Calculator — Calculate border strip irrigation volume from strip dimensions and application depth. Determine inflow rate needed for uniform water distribution.
Center Pivot Coverage Calculator — Calculate center pivot irrigation coverage area from pivot length. Estimate acres irrigated with and without corner systems using π × r².
Crop Water Requirement Calculator — Calculate crop water requirement (CWR) by summing ETc values across growth stages. Estimate total irrigation water needed for your crop season.
Drip Emitter Spacing Calculator — Determine optimal drip emitter spacing based on soil type and crop root spread. Match emitter wetted diameter to root zone for efficient watering.
Drip Irrigation Flow Rate Calculator — Calculate total drip irrigation flow rate from emitter count and flow per emitter. Convert GPH to GPM for pump sizing and system design.
Drip Line Length Calculator — Calculate total drip line or tape length needed for a field. Factor in field dimensions, row spacing, and header connections for material ordering.
Flood Irrigation Volume Calculator — Calculate flood irrigation water volume in acre-feet and gallons from irrigated area and application depth. Plan water deliveries accurately.
Furrow Irrigation Calculator — Estimate furrow irrigation application depth from advance time, recession time, and flow rate. Optimize furrow irrigation management for efficiency.
Irrigation Cost per Acre-Inch Calculator — Calculate the total cost to apply one acre-inch of irrigation water including energy, maintenance, labor, and water charges for budget planning.
Irrigation Depth per Application Calculator — Calculate gross irrigation depth per application from net depth and application efficiency. Plan how much water your system must deliver.
Irrigation Frequency Calculator — Calculate how often to irrigate by dividing net application depth by daily crop ETc. Determine the interval in days between irrigations.
Irrigation Scheduling Calculator — Schedule your next irrigation using soil water balance. Calculate trigger point from MAD, available water capacity, and root zone depth.
Irrigation System Efficiency Calculator — Calculate overall irrigation system efficiency by multiplying conveyance, distribution, and application efficiencies. Identify where water is lost.
LEPA Efficiency Calculator — Compare Low Energy Precision Application (LEPA) irrigation efficiency against sprinkler and flood systems. Calculate water savings and net delivery.
Sprinkler Application Rate Calculator — Calculate sprinkler application rate in inches per hour from GPM and sprinkler spacing. Ensure rate stays below soil intake to prevent runoff.