Drip Irrigation Run Time Calculator
Work out how long to run a drip system to apply a target water depth, from emitter discharge and spacing.
Application rate (mm/h) equals emitter discharge divided by the wetted area per emitter (spacing × lateral spacing), because 1 litre spread over 1 m² is 1 mm. Run the system for the time shown to apply your target depth.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Farmers and irrigation engineers use the free Drip Irrigation Run Time Calculator to get an accurate answer in seconds — no formulas to remember, works offline in the field.
About Drip Irrigation Run Time Calculator
Knowing how long to run a drip system is the difference between under-watering and wasting water. The application rate of a drip line is its emitter discharge divided by the area each emitter wets — and since one litre over one square metre equals one millimetre of depth, that rate is in mm/h directly. This tool takes your emitter discharge, emitter spacing and lateral spacing, computes the application rate, and tells you exactly how many minutes to run the system to deliver a target depth.
How to use Drip Irrigation Run Time Calculator
- 1Enter your system or field values into the inputs.
- 2Read the headline result and the supporting breakdown.
- 3Apply the guidance in the note to your irrigation plan.
Why use Drip Irrigation Run Time Calculator?
- ✓Uses the standard, citable irrigation engineering formula
- ✓Clear inputs with sensible defaults
- ✓Instant result with the working shown
- ✓Free, fully in-browser and private
Frequently asked questions
How do I calculate drip irrigation run time?+
Divide the water depth you want (mm) by the system's application rate (mm/h). The application rate is the emitter discharge (L/h) divided by the wetted area per emitter (emitter spacing × lateral spacing in m²). This tool does both steps for you.
What emitter discharge and spacing should I use?+
Use your installed system's figures — common inline drippers are 2 or 4 L/h at 30–50 cm spacing on laterals 0.6–1.5 m apart. Enter the actual values printed on your dripline and bought layout for an accurate run time.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline and your data never leaves the device.
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