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Agricultural Field Calculators
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Sprayer Calibration & Spray Rate Calculator — TeeJet Nozzle & GPA

Enter your target GPA, ground speed, and nozzle spacing to find the required nozzle output (oz/min). The TeeJet reference grid shows every tip that matches your settings — click any cell to use it.

Calibrate your sprayer to deliver the exact gallons per acre (GPA) your application requires. Enter boom speed, nozzle spacing, and target GPA — get required nozzle output in gallons per minute. The built-in TeeJet nozzle selection table covers XR, AIXR, TTI, and AI nozzle series across standard operating pressures, helping you select the right tip without a separate catalog. Used by farmers, custom applicators, and agronomists.

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Sprayer Calibration

Required nozzle output · TeeJet tip reference · tank coverage

Speed & Spacing
Typical field sprayer speed: 5–12 mph. Measure with GPS for accuracy.
Most boom sprayers use 15, 20, or 30-inch nozzle spacing.
Target Application Rate
Check your product label for minimum carrier volume requirements.
Tank Coverage (optional)
Total active nozzles across the full boom width.
Nozzle Series (optional — select one or more)
All series shown. Select one or more to filter the grid.
Desired Droplet Size (optional)
Select a droplet class to highlight matching nozzles in the grid. Check your product label for required droplet size.
TeeJet Nozzle Reference Enter speed & spacing to activate
Enter your target GPA and nozzle spacing above to see nozzle options.

Enter your sprayer settings and press Calculate to see gallons per acre, tank coverage, and nozzle output analysis.

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📊 Related calculators: Fertilizer Rate — calculate cost per acre and total product needed for your spray mix.  |  Field Size — confirm field acres before calculating total product requirements.

Disclaimer — Nozzle output and GPA calculations are estimates based on standard TeeJet catalog data and calibration formulas. To calculate product rates and build a tank mix, use the Fertilizer Rate Calculator. Always perform a physical catch test before field application. Follow all pesticide product labels, which govern required application rates, nozzle types, and pressure ranges. Label instructions supersede calculator results.

Frequently Asked Questions

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Sprayer calibration is the process of verifying and adjusting a spray system to ensure it delivers exactly the intended amount of product per acre. An uncalibrated sprayer can over-apply (wasting chemical and potentially damaging crops or the environment) or under-apply (reducing efficacy). Calibration involves measuring nozzle output, boom speed, and nozzle spacing. The TeeJet nozzle selection table in this calculator helps match the right nozzle to the target gallons-per-acre (GPA) at a given operating speed and pressure.

GPA = (nozzle output in fl oz/min × 5,940) ÷ (speed in mph × nozzle spacing in inches). The constant 5,940 converts units to US gallons per acre. For example: 20 oz/min at 7 mph with 20-inch spacing = (20 × 5,940) ÷ (7 × 20) = 118,800 ÷ 140 = 8.49 GPA.
Fill your tank with clean water and set your operating pressure. Hold a measuring container under one nozzle and collect the output for exactly 60 seconds. Record in fluid ounces or mL. Check 10–15% of your nozzles — any nozzle more than 10% above or below the average should be replaced.
Most field sprayers apply 5–20 GPA depending on the product and application type. Herbicide applications: 5–10 GPA. Fungicide and insecticide applications: 10–20 GPA. Foliar fertilizer applications: 3–15 GPA. Always check the product label for minimum carrier volume requirements.
GPA is inversely proportional to nozzle spacing — doubling spacing from 15 to 30 inches cuts GPA in half at the same speed and nozzle output. To maintain the same GPA with wider spacing, you must either reduce travel speed or use a nozzle with higher output.
Tank acres = tank size in gallons ÷ GPA. A 1,000-gallon tank at 10 GPA covers 100 acres per fill. Enter your tank size and number of nozzles in the calculator to see coverage alongside the GPA calculation.
Required nozzle output (fl oz/min) = (target GPA × speed in mph × nozzle spacing in inches) ÷ 5,940. Use Reverse mode in this calculator — enter your target GPA, speed, and spacing, and the required nozzle output is calculated automatically.
GPM per nozzle = (GPA × mph × nozzle spacing in inches) ÷ 5,940. For example, at 10 GPA, 7 mph, and 20-inch spacing: (10 × 7 × 20) ÷ 5,940 = 0.236 GPM per nozzle.
Dicamba products (XtendiMax, Engenia, FeXapan, Enlist DUO) require Extra Coarse (XC) to Ultra Coarse (UC) droplets. TeeJet TTI and AITTJ60 nozzles are approved. Always verify with the specific product label before applying.
XR produces Fine–Medium droplets for contact applications. AIXR uses a Venturi to create Coarse–Very Coarse droplets for drift reduction. TTI produces Extra Coarse–Ultra Coarse droplets and is required for many dicamba herbicide labels.
Divide oz/min by 128 to get GPM. For example, 30 oz/min ÷ 128 = 0.234 GPM. Nozzle catalog tables list GPM; catch-test calibrations use oz/min because 1-minute volumes are easier to measure accurately in the field.
Most row-crop boom sprayers use 15-inch or 20-inch spacing with 110° flat-fan nozzles. Wider spacing requires higher GPM per nozzle to achieve the same GPA at the same ground speed.
Most TeeJet flat-fan nozzles (XR, TT, DG) operate best at 20–40 PSI. Air-induction nozzles (AIXR, TTI) run 20–60 PSI. Higher pressure produces finer droplets and increases drift risk; lower pressure gives coarser, drift-resistant droplets.

Enter your boom speed (mph), nozzle spacing (inches), and target application rate (GPA — gallons per acre). The calculator returns the required nozzle output in gallons per minute (GPM). Cross-reference that GPM against the TeeJet nozzle table below to find the correct tip and pressure combination for your application rate. This is the standard spray rate calculation used for herbicide, fungicide, and insecticide applications on field sprayers.