1. What is a GPM Calculator for Sprayers?

Definition: This calculator determines the required flow rate (gallons per minute) for sprayer nozzles based on application rate, speed, and nozzle spacing.

Purpose: It helps farmers, landscapers, and agricultural professionals properly calibrate their spray equipment for accurate chemical application.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate per nozzle (gallons per minute)
• \( GPA \) — Application rate (gallons per acre)
• \( MPH \) — Travel speed (miles per hour)
• \( W \) — Nozzle spacing (inches)

Explanation: The formula converts application parameters into the required nozzle output to maintain consistent coverage.

3. Importance of Sprayer Calibration

Details: Proper GPM calculation ensures accurate chemical application, prevents over/under-application, and maintains spray pattern quality.

4. Using the Calculator

Tips: Enter the desired application rate (GPA), operating speed (MPH), and nozzle spacing (inches). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does the 5940 constant represent?
A: It's a conversion factor that accounts for units (acres, miles, inches, minutes).

Q2: How do I determine my application rate (GPA)?
A: This depends on your chemical label recommendations and desired coverage.

Q3: What's a typical nozzle spacing?
A: Common spacings are 20 inches for boom sprayers, but this varies by equipment.

Q4: Should I round up my GPM result?
A: Select the nearest available nozzle size that matches your calculated GPM.

Q5: How often should I recalibrate?
A: Whenever you change chemicals, application rates, or notice uneven coverage.