Sprinkler System Calculator

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Using This Site

This Site is a tool designed to assist a sprinkler system installer with calculations and a list of the most likely parts and quantities. Being a tool, it will likely not work as well for some projects as it does for others. The parts list is based on installing a PVC sprinkler system. The goal is for this site to help the installer save time and money. We will work hard to improve the calculations and make updates as they become necessary. Double check calculations and quantities before making your purchases.

Click to read disclaimer and legal agreement. By using this site you agree to the terms in the legal agreement.

Backflow

  • Will You Be Needing A Backflow Preventer?

A Backflow is required for any sprinkler system supplied from culinary (drinking) water. If you are not familiar with Backflows you need to do some research for your particular area since there are different requirements for different areas.

Main Line Available Water Supply

Enter the available water supply for irrigation. Available water supply is rated in gallons per minute (GPM). If you don't know what the available water supply is for the property, it can be measured, or it is generally safe to guess based on pipe size. Best guesses based on pipe size, 15 GPM for 1 inch pipe, 11 GPM for 3/4 inch pipe or 6 GPM for 1/2 inch pipe.

Percent Used

Percent used is the maximum amount of water you desire to use for irrigation. While you can, in theory, use 100 percent, it is recommended that you use 70-80 percent, after all, it is nice to have water available for things like showering, washing dishes, etc.

Main Line Size

  • Select the main line supply size for the property.

Type Of Main Line Pipe Currently Installed

  • Select the main line supply size for the property.

This selection is used to help determine the best way to connect to the existing water supply.

Timer

  • Will You Be Needing A Sprinkler Timer?

Stop & Waste

  • Will You Be Needing A Stop & Waste?

This is a must in areas that have hard freezes. The stop and waste is a shutoff valve that drains the down stream water from a main line. It is generally installed at the point of connection that is leading to the sprinkler system (generally close to the meter or a building). The Weep hole allows water to escape when the valve is closed. Thus a stop and waste is regularly installed at a depth that is sufficient to prevent freezing of the live side of the water main.

Number Of valve Locations

  • Will You Have Multiple Valve Locations? I.E. Front And Back Yard.

This divides the system into sections. Example: Front and Back Yard. Generally a residential sprinkler system will only have 1 or 2 locations. keep in mind that by choosing multiple locations the parts list won't be as accurate. We will strive to improve this function. It is recommended that you choose 1 or 2 locations.

Garden Spigot

Will You Be Installing Any Garden Spigots / Free Standing Hose Bibs?

Garden Spigots are a great source for large volumes of water to be supplied with a garden hose. They tend to have more volume and pressure than a regular garden spigot. The most common uses are filling a pool or hot tub quickly, and sprinkler system winterization (Access directly to the main line for blowing the system out with air).

Below, you will input sprinkler heads and emitters by selecting their nozzle size or emitter GPM. Simply press the plus button for the corresponding nozzle or emitter GPM. You can likewise remove a selection by pressing the subtract button.

  • Will You Have Any Zones With Rotors?

Rotor 5000 Series

-0+
  • Nozzle 1.0
  • Radius 25'-29'
-0+
  • Nozzle 1.5
  • Radius 27'-35'
-0+
  • Nozzle 2.0
  • Radius 29'-37'
-0+
  • Nozzle 2.5
  • Radius 35'-37'
-0+
  • Nozzle 3.0
  • Radius 29'-40'
-0+
  • Nozzle 4.0
  • Radius 37'-42'
-0+
  • Nozzle 5.0
  • Radius 39'-45'
-0+
  • Nozzle 6.0
  • Radius 39'-48'
-0+
  • Nozzle 8.0
  • Radius 47'-50'

Rotor 3500 Series

-0+
  • Nozzle .75
  • Radius 15'-18'
-0+
  • Nozzle 1.0
  • Radius 20'-22'
-0+
  • Nozzle 1.5
  • Radius 23'-24'
-0+
  • Nozzle 2.0
  • Radius 27'-28'
-0+
  • Nozzle 3.0
  • Radius 29'-32'
-0+
  • Nozzle 4.0
  • Radius 31'-35'

If you are planning to use Hunter products the calculations will be comparable if you select the nozzles by distance

  • Will You Have Any Zones With Spray Heads / Pop-ups?

Spray Nozzles

It is not recommended that you use standard VAN nozzles sizes 4, 6, 8 and 10 with this tool at this time. Substitute with HE-VAN or MPR nozzles for these sizes where applicable. If you must use standard VAN Nozzles, input these sizes using the nozzle that would be considered the next size up, as standard VAN nozzles have a higher GPM.

-0+

18-VAN at 1/4 14'-18'

-0+

18-VAN at 1/2 14'-18'

-0+

18-VAN at 3/4 14'-18'

-0+

18-VAN Full 14'-18'

-0+

15 Qtr 12'-15'

-0+

15 Half 12'-15'

-0+

15 Three Qtr 12'-15'

-0+

15 Full 12'-15'

-0+

Side Strip 15

-0+

End Strip 15

-0+

12 Qtr 10'-12'

-0+

12 Half 10'-12'

-0+

12 Three Qtr 10'-12'

-0+

12 Full 10'-12'

-0+

10 Qtr 8'-10'

-0+

10 Half 8'-10'

-0+

10 Three Qtr 8'-10'

-0+

10 Full 8'-10'

-0+

8 Qtr 5'-8'

-0+

8 Half 5'-8'

-0+

8 Three Qtr 5'-8'

-0+

8 Full 5'-8'

-0+

5 Qtr 3'-5'

-0+

5 Half 3'-5'

-0+

5 Three Qtr 3'-5'

-0+

5 Full 3'-5'

  • Will You Have Any Zones With Drip?

Drip Emitters

Linear Feet Of Drip Area

-0+ 10

Drip emitter stations very greatly, thus to keep the parts list more accurate we need some additional input. The linear feet of drip is representing the length of the area where you intend to install drip lines.

Number Of Areas Covered By Drip

-0+

The number of areas covered by drip, is the total locations for the whole yard. Example: If you are installing drip in 2 garden boxes and 1 flower bed you would enter 3 total locations.

Drip, Bubblers and Xeri Sprays are all covered in this section. You will need to know the GPH (Gallons Per Hour) for the emitters you plan to use. Simply select the option below that matches your rate of flow in GPH. If you are unsure which emitters to choose, here are some popular options/resources.

-0+

0.5 GPH

-0+

1.0 GPH

-0+

2.0 GPH

-0+

3.0-5.0 GPH

-0+

6.0-7.0 GPH

-0+

8.0-10.0 GPH

-0+

11.0-12.0 GPH

-0+

13.0-18.0 GPH

-0+

19.0-24.0 GPH

-0+

0-36.0 GPH

These calculations will work with all drip manufacturers as long as you choose the correct emitter for the rate of flow.

Sprinkler System Info.

  • System Parameters
    • 0 Property Main Line Size
    • 0 GPM Main Line Total Supply
    • 0 Main Line Velocity, Feet Per Second
    • 0 Total GPM For Irrigation
    • 0 Total Number Of Stations That Are Not Drip
    • 0 Total Number Of Stations / Valves
    • 0 Total Estimated PVC Based On Selections
    • 0 Total Number Of Valve Locations/Boxes
    • 0 Garden Spigots
  • Rotors
    • 0 Total GPM for Rotors
    • 0 Total Number of Valves Needed For Rotors
    • 0 Total Number Of Rotors
  • Pop-ups / Spray Heads
    • 0 Total GPM for Spray Heads
    • 0 Total Number Of Valves For Spray Heads / Pop-ups
    • 0 Total Number Of Spray Heads / Pop-ups
  • Drip
    • 0 Linear Feet Of Drip Area
    • 0 Total Number Of Areas or Locations Covered By Drip
    • 0 Total GPM For Drip And Bubblers
    • 0 Total Number Of Bubblers and/or Drip Emitters

Personal Parts List

  • Glue and Sealant
    • 0 Grey Glue 1/2 PintDelete
    • 0 Primer 1/2 PintDelete
    • 0 Blue Glue 1/2 PintDelete
    • 0 Teflon TapeDelete
    • 0 Pipe Dope (not necessary, but recommended)Delete
  • Pipe
    • 0 Estimated Feet 1" PVC Sch 40Delete
    • 0 Estimated Feet 3/4" PVC Sch 40Delete
    • 0 Feet 2" PVC (Intended For Stop and Waste)Delete
    • 0 Rolls Swing Pipe / Funny PipeDelete
  • Stop and Waste
    • 0 Stop And Waste Delete
    • 0 Snug CapDelete
    • 0 Brass Compression Tee ForDelete
    • 0 Brass NipplesDelete
    • 0 Brass Elbow / 90Delete
    • 0 10 inch Round BoxDelete
  • Backflow, Timer and Spigot Parts
    • 0 Backflow Delete
    • 0 Timer StationsDelete
    • 0 Galvanized 1" x 18" or 1" x 24" nipplesDelete
    • 0 Galvanized 1" x 3" nippleDelete
    • 0 Galvanized 1" 90 / elbowDelete
    • 0 Galvanized 1" street 90 / elbow (If street 90's are not available, substitute with 2 close nipples and 2 regular 90's)Delete
    • 0 Galvanized 1" unionDelete
    • 0 Female Adapter 1"Delete
    • 0 Spigot / Inverted Hose BibDelete
  • Valves and Manifolds
    • 0 1" automatic sprinkler control valve with flow controlDelete
    • 0 1" Drip Valve with filter kit Delete
    • 0 Feet of Sprinkler Wire Strand (Not accurate, it is recommended that you measure installation site for wire)Delete
    • 0 Auto DrainsDelete
    • 0 Box Standard / Jumbo (Jumbo Recommended for manifolds with drip zones)Delete
    • 0 Tee 1" Slip x 1" Thread PVCDelete
    • 0 Elbow 1" Slip x 1" Thread PVCDelete
    • 0 Reducer bushing 1" x 3/4" PVCDelete
    • 0 Union Threaded PVCDelete
    • 0 Union Slip PVCDelete
    • 0 Close Nipples PVCDelete
    • 0 Nipple 1" x 12" Extruded PVCDelete
    • 0 Grease Nuts / Grease PacksDelete
  • Sprinkler Heads and Swing Joint Parts
    • 0 Pop-up Bodies 1804 or similarDelete
    • 0 Rotor Rain Bird® 5000Delete
    • 0 Rotor Rain Bird® 3500Delete
    • 0 Marlex 3/4" Street ElbowDelete
    • 0 Marlex 1/2" Street ElbowDelete
    • 0 Funny Elbow 3/4", Swing Barbed x 3/4" ThreadDelete
    • 0 Funny Elbow 1/2", Swing Barbed x 1/2" ThreadDelete
    • 0 Tee 1" Slip x 1/2" Thread PVCDelete
    • 0 Tee 3/4" Slip x 1/2" Thread PVCDelete
    • 0 Elbow 3/4" Slip x 1/2" Thread PVCDelete
  • Lateral and Main Line Parts
    • 0 Tee 1" SlipDelete
    • 0 Tee 3/4" SlipDelete
    • 0 Elbow 1" SlipDelete
    • 0 Elbow 3/4" SlipDelete
    • 0 Coupling 1" SlipDelete
    • 0 Coupling 3/4" SlipDelete
  • Drip lines and Fittings
    • 0 Feet 1/2" Drip supply LineDelete
    • 0 Drip Male Adapter 1/2"Delete
    • 0 PVC Coupling 1/2" ThreadedDelete
    • 0 Drip Tee 1/2" Delete
    • 0 Drip Manual Flush Valve, 1/2" Ball Valve w/ Barbed ConnectorsDelete
    • 0 Di Drip 1/2" Coupling, Barbed Connector Delete
    • 0 Drip Tubing Puncture Connectors 1/4" Delete
    • 0 feet Drip Tubing 1/4" Delete
    • 0 Drip Emitter 0.5 GPHDelete
    • 0 Drip Emitter 1.0 GPHDelete
    • 0 Drip Emitter 2.0 GPHDelete
    • 0 Drip Emitter 5.0 GPHDelete
    • 0 Drip Emitter 7.0 GPHDelete
    • 0 Drip Emitter 10.0 GPHDelete
    • 0 Drip Emitter 12.0 GPHDelete
    • 0 Drip Emitter 18.0 GPHDelete
    • 0 Drip Emitter 24.0 GPHDelete
    • 0 Drip Emitter 36.0 GPHDelete
  • Spray Nozzles Rain Bird®
    • 0 18 VANDelete
    • 0 15 1/4Delete
    • 0 15 1/2Delete
    • 0 15 3/4Delete
    • 0 15 FullDelete
    • 0 15 Side Strip or Center StripDelete
    • 0 15 Corner Strip or End StripDelete
    • 0 12 1/4Delete
    • 0 12 1/2Delete
    • 0 12 3/4Delete
    • 0 12 FullDelete
    • 0 10 1/4Delete
    • 0 10 1/2Delete
    • 0 10 3/4Delete
    • 0 10 FullDelete
    • 0 8 1/4Delete
    • 0 8 1/2Delete
    • 0 8 3/4Delete
    • 0 8 FullDelete
    • 0 5 1/4Delete
    • 0 5 1/2Delete
    • 0 5 3/4Delete
    • 0 5 FullDelete

Disclaimer

Last updated: March 02, 2019

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