Estimate the utility cost of garden watering from flow rate, watering duration, frequency, season length, and water price. Use the editable assumptions to test a current routine, compare alternatives, and see the annual effect without building a separate spreadsheet.
Fill in Flow rate, Minutes per session.
Complete the remaining fields so the estimate reflects your normal pattern.
The calculator updates automatically after each input change.
Change one assumption at a time to see how the main total and breakdown respond.
Use Reset to restore the original example values.
Gallons per session = flow rate × minutes. Annual gallons = gallons per session × sessions per week × watering weeks. Annual cost = annual gallons ÷ 1,000 × water rate.
The result converts an irrigation routine into estimated utility spending.
Sewer charges, tiered pricing, rainfall, and system efficiency can change the actual bill.
Given: 5 gallons per minute for 30 minutes, three times a week, over 26 weeks, at $8 per 1,000 gallons. Calculation: 5 × 30 = 150 gallons per session; 150 × 3 × 26 = 11,700 gallons; 11,700 ÷ 1,000 × $8 = $93.60. Result: annual garden water cost is about $93.60.
Check the hose or irrigation specification, or measure how long it takes to fill a container of known volume.
Use the marginal rate likely to apply to garden use, or test more than one rate.
Only when you reduce sessions or weeks to reflect skipped watering.
This version expects gallons and a price per 1,000 gallons. Convert liters before entering values.
Some utilities add sewer charges, fixed fees, or higher-tier rates based on total household use.