🧮

Sprinkler Head Count Per Pipe Calculator

Wondering how many sprinkler heads you can run on a 1-inch pipe or a 3/4-inch line? Instantly estimate your system’s capacity and avoid low pressure, dry spots, and wasted water. Perfect for lawn irrigation, garden design, and sprinkler repair planning.

Results

What does this mean?

How Does This Work?

This calculator uses pipe sizing, sprinkler GPM, and water pressure (PSI) to estimate how many sprinkler heads you can run on your line. It’s based on industry standards for irrigation design and helps you avoid low pressure and uneven watering.

Choose your pipe size and sprinkler type (or enter custom GPM).
Enter your available flow rate and water pressure.
Advanced users: adjust for friction loss (long pipe runs).
See instant results, warnings, and upgrade suggestions.

Why does pipe size matter? Too many heads on a small pipe causes pressure loss, dry spots, and system failure. Use the right size for a healthy, green lawn!

Quick Reference: Pipe Size & Max Heads

Pipe Size	Max GPM	Typical Max Heads*	Best Use
1/2"	7	4-5	Drip, small beds
3/4"	11	6-10	Small lawns, side zones
1"	18	12-18	Main lines, standard lawns
1 1/4"	24	18-24	Large lawns, commercial
1 1/2"	28	24-28	Sports fields, parks

*Actual max heads depends on head GPM, pressure, and layout. Always check manufacturer specs and local codes.

Frequently Asked Questions

How many sprinkler heads can I run on a 3/4" pipe?

Typically 6–10 heads, depending on head GPM and available flow. Always check your system’s flow and pressure before finalizing design.

What happens if I exceed the pipe’s max GPM?

Exceeding max GPM causes pressure loss, uneven watering, and can damage pipes. Stay within recommended limits for best results.

How do I measure my available flow rate?

Use a 5-gallon bucket and a stopwatch: time how long it takes to fill, then calculate GPM. Or use a flow meter for accuracy.

Should I use 1" or 1 1/4" pipe for my main line?

1" is standard for most homes, but 1 1/4" is better for large lawns or high head counts. Bigger pipe = less friction loss.

What is friction loss and why does it matter?

Friction loss is the pressure drop as water moves through pipe. Long runs and small pipes increase loss, reducing pressure at the heads. Use the advanced mode to account for this.

Results update instantly as you change any value.