In short: at a typical garden hose flow of 9 GPM, a 1,000-gallon pool takes about 1 hour 51 minutes to fill, and a 5,000-gallon pool takes about 9 hours 16 minutes. Fill time is simply volume divided by flow rate — a wider hose, higher pressure, or a second hose all shorten it.
These figures are planning aids based on a steady flow rate. Actual time varies with your home's water pressure, hose length and diameter.
How to calculate garden hose fill time
Fill time comes from one of the simplest relationships in hydraulics: how much you need to fill, divided by how fast water is arriving.
This calculator converts your container's volume to US gallons and your hose's flow rate to gallons per minute, then divides one by the other. The result updates instantly in minutes, hours, seconds, or a plain-language "hours and minutes" readout.
Worked example. Take the default case: a 1,000-gallon pool filled from a typical 1/2-inch garden hose flowing at 9 GPM. Fill time = 1,000 ÷ 9 = 111.1 minutes, which is 1 hour 51 minutes, or 6,667 seconds. That single division is the entire calculation — the work is in knowing your container's volume and your hose's real flow rate.
The flow rate is what actually varies. Container volume is usually easy to look up or measure. Hose flow rate is the wildcard — it depends on hose diameter, length, any nozzle or spray attachment, and your home's water pressure. If your fill time seems off, that number is the first place to check.
Why your hose's real flow rate matters
A standard 1/2-inch garden hose at typical household pressure delivers around 9 to 12 GPM. Step up to a 5/8-inch or 3/4-inch hose and the same pressure can push 12 to 17 GPM, because a wider hose offers far less resistance. A spray nozzle, kink, or long hose run (past roughly 50–100 feet) can cut the effective flow noticeably below the hose's rated maximum.
The most reliable number is one you measure yourself: time how long it takes to fill a 5-gallon bucket at full flow from the exact hose and spigot you'll use, then divide 5 by that time in minutes. Our garden hose flow rate calculator does that conversion for you — plug the result straight into the flow rate field above.
Fill time by container volume
Fill time at a fixed 9 GPM hose flow rate — the typical rate for a 1/2-inch garden hose.
| Volume | Fill time | Hours & minutes |
|---|---|---|
| 50 gal · small trough | 5.56 min | 5 min 33 sec |
| 100 gal · stock tank | 11.11 min | 11 min 7 sec |
| 150 gal · kiddie pool | 16.67 min | 16 min 40 sec |
| 300 gal · large tank | 33.33 min | 33 min 20 sec |
| 500 gal · hot tub | 55.56 min | 55 min 33 sec |
| 1,000 gal (default) | 111.11 min | 1 hr 51 min |
| 5,000 gal · large pool | 555.56 min | 9 hr 16 min |
| 10,000 gal · big pool | 1,111.11 min | 18 hr 31 min |
Fill time by hose flow rate
Fill time for a fixed 1,000-gallon pool at different hose flow rates.
| Flow rate | Fill time | Hours & minutes |
|---|---|---|
| 6 GPM · restricted | 166.67 min | 2 hr 47 min |
| 9 GPM · 1/2″ hose (default) | 111.11 min | 1 hr 51 min |
| 12 GPM · 5/8″ hose | 83.33 min | 1 hr 23 min |
| 17 GPM · 3/4″ hose | 58.82 min | 58 min 49 sec |
Worked examples
Filling a kiddie pool
16.7 min
A 150-gallon kiddie pool at a typical 9 GPM garden hose flow rate takes about 17 minutes — barely enough time to get the towels out.
Topping off a rain barrel
9.2 min
A 55-gallon rain barrel at a restricted 6 GPM (nozzle attached) flow rate fills in about 9 minutes.
Filling a large aboveground pool
6 hr 57 min
A 5,000-gallon pool from a 5/8-inch hose at 12 GPM takes almost 7 hours — many pool owners run the hose overnight or split it across two spigots.
What else affects the result
Water pressure. Higher supply pressure pushes more water through the same hose diameter each minute. If your home's pressure is unusually low, your real flow rate — and fill time — will be worse than the typical figures above. See the water pressure calculator to check yours.
Hose length and diameter. Long, narrow hoses lose more flow to internal friction. A 100-foot 1/2-inch hose delivers noticeably less than a 25-foot hose of the same diameter at the same pressure.
Multiple hoses or spigots. Running two hoses from separate spigots roughly doubles total flow into the same container, if your home's supply pressure can support both at once.
Frequently asked questions
How long does it take to fill a pool with a garden hose?
It depends on the pool's volume and the hose's flow rate: time equals volume divided by flow rate. A typical garden hose flows around 9 GPM, so a 1,000-gallon pool takes about 111 minutes (1 hour 51 minutes). A 5,000-gallon pool at the same flow rate takes about 9 hours 16 minutes.
How many gallons per minute does a garden hose flow?
A standard 1/2-inch garden hose at typical household pressure flows around 9 to 12 GPM, and a 5/8-inch or 3/4-inch hose can reach 12 to 17 GPM. The exact rate depends on hose diameter, length and your home's water pressure. If you know your actual rate, use it for the most accurate fill time.
How can I fill a pool faster with a hose?
Use a shorter, wider-diameter hose (5/8 or 3/4 inch instead of 1/2 inch), remove any spray nozzle or restrictive fitting, check for kinks, and if possible run two hoses from separate spigots at once. Higher water pressure also increases flow, within your home's safe supply pressure range.
Does hose length affect fill time?
Yes, longer hoses lose more flow to internal friction, especially past 50 to 100 feet or with narrower hoses. If your actual flow rate is measured at the hose outlet, that already accounts for the length you tested; enter that measured rate for the most accurate result.
Does water pressure affect how fast a hose fills a pool?
Yes. Higher supply pressure pushes more water through the same hose diameter each minute, increasing the flow rate and shortening fill time. If your home pressure is unusually low or high, measure your hose's actual flow rate rather than relying on a typical figure.
How do I measure my garden hose's actual flow rate?
Time how long it takes to fill a 5-gallon bucket at full flow, then divide 5 by that time in minutes to get gallons per minute. Our garden hose flow rate calculator does this conversion for you.
Sources & references
- US EPA WaterSense. Outdoor Water Use Fact Sheets — typical garden hose flow rates.
- American Water Works Association (AWWA). Residential water use references.
John Mac, PE
Water Systems Specialist · Austin, Texas
Texas-licensed Professional Engineer with 13+ years in residential water systems and 180+ completed projects. Writes and reviews the calculators on watercalculator.us. Read full bio
Texas PE (2016) · BS Civil Engineering, Hydraulics (2013)