Tools you might need next
Calculate optimal seed spacing, plants per row, and rows per bed for vegetable garden planning and efficient seed placement.
Convert NPK fertilizer ratios and calculate precise application rates per square foot for lawns, gardens, and raised beds.
Calculate cubic feet and cubic yards of soil mix needed to fill your raised garden beds from length, width, and fill depth.
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.