Tree Watering Calculator
Estimate a user-defined tree-watering schedule from tree count, trunk diameter, water-per-diameter factor, watering frequency, emitter flow and water price.
Default project preview
240 gal
Runtime per tree
225 min
Weekly water use
480 gal
Seasonal water use
12,480 gal
Seasonal events
52
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Number of trees
Enter this project assumption in a unitless value. The current imperial default is 8. Minimum: 1.
Average trunk diameter
Enter this project assumption in in. The current imperial default is 3 in.
Water per diameter unit
Enter this project assumption in gal/in. The current imperial default is 10 gal/in.
Waterings per week
Enter this project assumption in a unitless value. The current imperial default is 2. Minimum: 0.
Watering-season length
Enter this project assumption in weeks. The current imperial default is 26 weeks. Minimum: 1.
Combined emitter flow per tree
Enter this project assumption in gal/h. The current imperial default is 8 gal/h.
Water price
Enter this project assumption in per 1,000 gal. The current imperial default is 9 per 1,000 gal. Minimum: 0.
How to read the outputs
Runtime per tree
8 gal/h flow. Default preview: 225 min.
Weekly water use
2 events per week. Default preview: 480 gal.
Seasonal water use
26 weeks. Default preview: 12,480 gal.
Seasonal events
entered schedule. Default preview: 52.
Total emitter runtime
all trees combined. Default preview: 30 tree-hours/event.
Seasonal water cost
water charge only. Default preview: $112.32.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Water per tree = trunk diameter × entered water factor. Event water multiplies by tree count; seasonal water multiplies by frequency and weeks.
Related tools
Continue planning the project
FAQ
Tree Watering Calculator questions
Is one water factor correct for every tree?+
No. Use local horticultural guidance and adjust for species, establishment stage, soil and weather.
Why calculate runtime from emitter flow?+
Runtime converts the target volume into an operating schedule for the installed emitters.
Should rainfall reduce the schedule?+
Usually yes. Effective rainfall and soil moisture should inform irrigation frequency.