Garden watering calculator

Enter the area, its weekly water need and this week’s rainfall to get an estimated amount of water to give.

AreaWeekly water needRainfall this week

Water to give per week estimated—

Depth still needed estimated—

How is it calculated?

Many vegetable beds and lawns need about 1 in (2.5 cm) of water a week, more in hot weather and sandy soil. Rain is subtracted from the need. 1 in over 1 sq ft is about 0.62 gallons (1 cm over 1 m² is 10 litres). Check soil moisture before watering.

Sources

Watering the vegetable garden — University of Minnesota Extension
What is an Inch of Water? — Purdue Landscape Report

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