Irrigation Timer Calculator — Watering Duration & Frequency
Work out watering duration and frequency for your irrigation system.
How We Calculate This
Weekly water need = Area × mm needed per week (converted to litres: 1mm on 1m² = 1 litre).
Session duration = (Litres per session ÷ System flow rate per hour) × 60 minutes.
Flow rates: Sprinkler ~800 L/hr, Soaker hose ~400 L/hr, Drip system ~200 L/hr.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates based on standard gardening guidelines. Results may vary with soil conditions, climate, and plant varieties.