Getting the right pump size for your boom sprayer is key to getting consistent coverage and avoiding downtime. This tool helps you estimate how much flow (in GPM) your sprayer pump needs based on your nozzle setup and any extra features like agitation, a handgun, or a rinse system.
Boom Sprayer Pump Sizing Calculator
Use this calculator to estimate the required flow rate for your sprayer pump based on nozzle specs and system needs.
How to Use Sprayer Pump Sizing Tool
- Enter the number of nozzles on your sprayer boom.
- Input the flow rate (GPM) per nozzle — you can find this on the nozzle chart based on your nozzle color and operating pressure.
- Check any additional features your sprayer has:
- Agitation: if you’re circulating liquid inside the tank
- Handgun: if you’re using a spray gun for spot treatments
- Rinse or Accessories: if you have a rinse nozzle, induction system, or other flow-consuming equipment
Once you fill it out, the calculator will show:
- Your total nozzle flow
- How much buffer is needed
- The recommended minimum pump size to ensure consistent spray and system performance
This calculator is designed to provide a helpful estimate for sizing a boom sprayer pump based on general application practices. It’s a great starting point, but it’s not a substitute for detailed system design or manufacturer specs.
Actual requirements may vary depending on your equipment setup, target chemicals, terrain, and operating conditions. For more details, be sure to read this full guide that breaks down how to size a pump in more detail.
Why Proper Pump Sizing Matters
Choosing the right pump size isn’t just about matching specs—it’s about making sure your sprayer performs consistently in the field. If your pump is undersized, you may not be able to maintain the pressure or flow needed for full coverage, especially if you’re spraying at higher speeds or using accessories like agitation or a spray gun. That can lead to missed spots, uneven application, and wasted product.
On the other hand, oversizing the pump can drive up costs and strain your system if not properly regulated. The sweet spot is selecting a pump that provides just enough capacity for your current needs—with a little room for future flexibility.
A properly sized pump helps you:
- Prevent under- or over-application of chemicals
- Maintain consistent spray patterns
- Hit your target GPA (gallons per acre)
- Reduce wear and tear on system components
Common Flow Rates & Pressure Ranges for Boom Sprayers
Boom sprayers come in a wide range of sizes and setups, so flow and pressure needs can vary quite a bit. Here’s a general guide to help you understand typical operating ranges:
| Sprayer Type | Flow Range (GPM) | Pressure Range (PSI) |
|---|---|---|
| Small ATV Boom Sprayer | 1–5 GPM | 15–60 PSI |
| Mid-Size Tractor Boom | 5–25 GPM | 30–80 PSI |
| Large Ag Boom Sprayer | 20–100+ GPM | 40–120 PSI |
Keep in mind:
- Lower pressure (20–60 PSI) is often used for broadcast herbicide application.
- Higher pressure (60–150 PSI or more) is used when great distance or “reach” is needed from a spray gun. Flow rate must be adequate as well to spray great distance or you will have just a “mist”.
- Your GPA (gallons per acre), nozzle size, nozzle spacing, and travel speed.
This calculator helps you estimate your GPM needs and choose a pump that matches both your flow and pressure requirements.