Fill time · 1,500 gal
How long to fill a 1,500 gallon tank
At a typical 8 GPM garden-hose flow: 3 h 8 min. Full table below; exact math is volume ÷ flow.
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| Flow rate | Time | Minutes |
|---|---|---|
| 2 GPM | 12 h 30 min | 750.0 min |
| 5 GPM | 5 h 0 min | 300.0 min |
| 8 GPM | 3 h 8 min | 187.5 min |
| 10 GPM | 2 h 30 min | 150.0 min |
| 15 GPM | 1 h 40 min | 100.0 min |
| 20 GPM | 1 h 15 min | 75.0 min |
| 30 GPM | 50 min | 50.0 min |
| 50 GPM | 30 min | 30.0 min |
Flow-rate reality check: hose bib with good pressure 6–10 GPM; 1/2 HP transfer pump 20–40 GPM; gravity from an IBC barely 5 GPM through a garden fitting. Time a 5-gallon bucket and divide — it beats every nameplate rating. For the volume side, the tank charts give exact gallons at any depth.
FAQ
How long does it take to fill a 1500 gallon tank with a garden hose?
A typical hose delivers 6–10 GPM — call it 4 h 10 min to 2 h 30 min for 1,500 gallons. Bucket-test your actual flow: a 5-gallon bucket filling in 30 seconds is 10 GPM.
How long with a transfer pump?
At a common 30 GPM transfer rate, about 50 min. At 50 GPM, 30 min.
Does draining take the same time?
Only if the flow is constant. Gravity drains slow as the head drops, so treat these times as a lower bound for draining.