Tools you might need next
Calculate mulch cubic yards or bags from bed area and depth. Estimate wood mulch, bark, and rubber mulch for landscaping beds and garden paths.
Calculate pavers needed for patio or walkway. Enter area, paver size, and pattern waste to get paver count, base gravel, and sand bedding quantities.
Calculate gravel cubic yards for driveways, paths, and drainage. Enter area and depth to get tons, cubic yards, and dump truck loads for crushed stone projects.
Multiply number of emitters by each emitter flow rate to get branch or zone flow.
zone GPH = emitter count × GPH per emitterCompare total GPH to faucet or pump capacity. Most household hose bibs support roughly 3 to 6 GPM depending on pressure.
Divide daily plant water requirement by zone flow to estimate minutes of irrigation per day.
runtime (min) = daily gallons needed / zone GPH × 60Updated: July 2026
Sum 0.5 GPH emitters on tomatoes and peppers to see if one 1/2-inch main line can supply the zone.
Check whether total GPH exceeds supply so you know when to add a second valve.
Size the number of simultaneous zones from measured pump or municipal flow.
Add each branch separately. A zone with mixed 0.5 and 2 GPH emitters needs weighted totals.
Verify actual emitter output at your pressure. Clogged or undersized lines change delivery.
Match emitters, tubing, and timer runtimes to your water supply. Enter emitter specs and layout counts to get zone flow in GPH and total daily volume.