YielixPlan, Schedule, and Optimize Your Irrigation
Efficient irrigation starts with understanding how much water your crops actually need and delivering it at the right time. These calculators walk you through the full irrigation planning workflow — from estimating daily evapotranspiration with the FAO-56 Penman-Monteith ET₀ method, through converting ET₀ into crop-specific water requirements, to scheduling irrigation events using soil moisture depletion thresholds.
Whether you are designing a new drip system and need to calculate emitter spacing, evaluating friction losses in your mainline, or budgeting seasonal water and energy costs, each tool uses published engineering methods (FAO-56, Hazen-Williams, USDA-SCS) so you can trust the results and cross-check them against field measurements.
Use the task-based groupings below to find the right starting point for your workflow, or browse the complete set of nine irrigation calculators. Each calculator page includes a worked example, explanation of inputs, and links to related tools and guides.
Common Irrigation Tasks
Determine How Much Water Your Crops Need
Start with reference evapotranspiration, factor in crop coefficients and effective rainfall, then calculate net irrigation requirements.
Schedule and Run Your Irrigation System
Convert water requirements into runtime minutes, set irrigation intervals based on soil moisture depletion, and estimate seasonal costs.
Design and Size Irrigation Infrastructure
Size pumps, calculate pipe friction losses, and lay out drip emitter spacing for new system designs or retrofits.
All Irrigation Calculators
Calculate reference evapotranspiration using the FAO-56 Penman-Monteith equation for irrigation planning
Calculate crop water needs from ET₀, crop coefficient, and irrigation efficiency
Calculate how long to run your irrigation system based on flow rate, area, and target application depth
Calculate friction head loss in irrigation pipes using the Hazen-Williams equation
Calculate required pump power from flow rate and total dynamic head for irrigation systems
Calculate emitter count, total flow, and lateral length for drip irrigation layout
Calculate effective rainfall using the USDA-SCS method to determine irrigation reduction
Calculate irrigation scheduling from soil properties, root depth, and daily crop water use
Calculate seasonal irrigation water and energy costs per hectare or acre
Irrigation Guides
How to Calculate Crop Water Requirements
Learn how to use ET₀ and crop coefficients to determine exactly how much water your crops need throughout the growing season.
Irrigation Scheduling: When and How Much to Water
Master irrigation timing using soil moisture, MAD thresholds, and crop water use to prevent both over- and under-watering.
Designing a Drip Irrigation System
Step-by-step guide to designing a drip irrigation system including emitter spacing, pipe sizing, and pump selection.