If you know the square footage of the area you want to irrigate, whether it is a garden or turfgrass, and what type of soil you have, this calculator will give you the the following information:
Estimated amount of dripperline (in feet)
The range of inches apart the rows can be
The distance between drippers
The total number of drippers in the zone
The flow of the zone in GPM
The application rate of water in inches per hour based on the row spacing you choose
The amount of time to apply 1/4" of water based on the row spacing you choose
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Before you begin, we need to know if you are irrigating shrubs and groundcover, (a garden) or turfgrass. We'll also need to know how many square feet you want to irrigate.
Choose the the type of soil you have. If you believe your soil is a clay-loam, choose loam. If you believe it is a sandy-loam, choose sand.
About Netafim USA 
If you know the square footage of the area you want to irrigate, whether it is a garden or turfgrass, and what type of soil you have, this calculator will give you the the following information: 