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.
Rain that falls directly on a field is part of the crop-water balance: use the Effective Rainfall Calculator before estimating irrigation requirement and scheduling. Rain captured from a roof is a separate supply source: the Rainwater Harvesting Calculator compares supplied roof-rainfall records with matching non-potable demand and optional coarse storage, while the Water Cost Calculator keeps delivery and energy costs visible. If that source will feed an injector, the Fertigation Injector & Stock Tank Calculator helps document the source-water nutrient assumption separately from the dilution calculation.
Use the task-based groupings below to find the right starting point for your workflow, or browse the complete registry-derived irrigation collection. These hub cards are navigation only; each calculator page contains its live inputs, results and chart/table detail. The Irrigation Guides collection includes the roof-capture planning guide; the connected fertigation guide below stays in its canonical Greenhouse collection.
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.
Plan Water Sources & Storage
Estimate potential roof capture from supplied rainfall, compare it with non-potable demand or a coarse tank balance, and keep that supply separate from field effective rainfall.
All Irrigation Calculators
ET₀ Calculator
Calculate reference evapotranspiration using the FAO-56 Penman-Monteith equation for irrigation planning
Irrigation Water Requirement Calculator
Calculate crop water needs from ET₀, crop coefficient, and irrigation efficiency
Irrigation Runtime Calculator
Calculate how long to run your irrigation system based on flow rate, area, and target application depth
Pipe Friction Loss Calculator
Calculate friction head loss in irrigation pipes using the Hazen-Williams equation
Irrigation Pump Sizing Calculator
Calculate required pump power from flow rate and total dynamic head for irrigation systems
Drip Emitter Spacing Calculator
Calculate emitter count, total flow, and lateral length for drip irrigation layout
Effective Rainfall Calculator
Calculate effective rainfall using the USDA-SCS method to determine irrigation reduction
Soil Moisture Depletion Calculator
Calculate irrigation scheduling from soil properties, root depth, and daily crop water use
Water Cost Calculator
Calculate seasonal irrigation water and energy costs per hectare or acre
Rainwater Harvesting Calculator
Estimate potential roof runoff from supplied rainfall, catchment area and collection efficiency, with optional monthly demand coverage and coarse tank balance.
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.
Rainwater Harvesting for Farm Irrigation
Estimate roof-water supply from measured rainfall and collection losses, compare matching demand periods, and plan storage without confusing harvested roof water with effective field rainfall.
Connected Fertigation Guide
This next-step guide remains in the Greenhouse planning-guide collection because it covers stock-tank mixing and injector verification, while linking that work to the water-source plan here.