To convert US gallons per minute to acre-feet per day, multiply by 0.00441919192. That factor is the whole relationship: both units measure volumetric flow, so the conversion is a proportion with no offset and no substance-specific constant.
The US standard for pumps, irrigation and fixtures. Irrigation and reservoir release rates in the western United States.
Standard versus actual volume. Gas flow in CFM depends on pressure and temperature, which is why compressor ratings say SCFM and specify the reference conditions. Converting the number is exact; comparing two ratings measured at different conditions is not. The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in acre-feet per day, so you can sanity-check whether your answer is a plausible size.
The formula
US gallons per minute- The amount you are converting, in US gallons per minute
0.00441919191958- The exact number of acre-feet per day in one US gallon per minute
acre-feet per day- The converted result
How it works, step by step
- Enter the value in US gallons per minute.
- It is multiplied by 0.00441919191958, the exact factor between the two units.
- The answer is shown in acre-feet per day, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A fire hydrant: 951 GPM in acre-feet per day
A fire hydrant comes to about 951 GPM. Multiplying by the factor: 951 × 0.00441919 = 4.20265 ac ft/d. Dividing the answer back by 0.00441919 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A shower head: 2.54 GPM in acre-feet per day
Take a shower head, roughly 2.54 GPM. The conversion is a single multiplication — 2.54 × 0.00441919 — giving 0.0112247 ac ft/d. Because the relationship is proportional, doubling the input doubles the answer to 0.0224495 ac ft/d.
How to read your score
Frequently asked questions
How many acre-feet per day are in one US gallon per minute?
Exactly 0.00441919191958. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert US gallons per minute to acre-feet per day?
acre-feet per day = US gallons per minute × 0.00441919191958. Reversed, US gallons per minute = acre-feet per day ÷ 0.00441919191958, which is the same as multiplying by 226.285714266.
Which is the bigger unit, the US gallon per minute or the acre-foot per day?
The acre-foot per day. One US gallon per minute is only 0.00441919 of a acre-foot per day, so it takes 226.286 US gallons per minute to make one acre-foot per day.
What does this quantity actually measure?
Both units measure volumetric flow. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a US gallon per minute?
The US standard for pumps, irrigation and fixtures.
What is a acre-foot per day?
Irrigation and reservoir release rates in the western United States.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do GPM to ac ft/d in my head?
Plenty of people do this in their head: divide by 230 instead of using the exact factor 0.00441919192. At 100 that shortcut gives 0.43478261 acre-feet per day, off by 0.007137 acre-feet per day or about 1.61%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Us Gallons Per Minute to acre-feet per day reference tables
| Us Gallons Per Minute | Acre-Feet Per Day |
|---|---|
| 0.5 GPM | 0.0022096 ac ft/d |
| 1 GPM | 0.00441919 ac ft/d |
| 2 GPM | 0.00883838 ac ft/d |
| 3 GPM | 0.0132576 ac ft/d |
| 5 GPM | 0.022096 ac ft/d |
| 10 GPM | 0.0441919 ac ft/d |
| 20 GPM | 0.0883838 ac ft/d |
| 25 GPM | 0.11048 ac ft/d |
| 50 GPM | 0.22096 ac ft/d |
| 75 GPM | 0.331439 ac ft/d |
| 100 GPM | 0.441919 ac ft/d |
| 250 GPM | 1.1048 ac ft/d |
| 500 GPM | 2.2096 ac ft/d |
| 1000 GPM | 4.41919 ac ft/d |
| 5000 GPM | 22.096 ac ft/d |
Exact factor: 1 US gallon per minute = 0.00441919191958 acre-feet per day.
| Quantity | GPM | ac ft/d |
|---|---|---|
| A dripping tap | 0.001585 GPM | 7.005e-06 ac ft/d |
| A bathroom tap | 1.585 GPM | 0.007005 ac ft/d |
| A shower head | 2.536 GPM | 0.01121 ac ft/d |
| A garden hose | 4.755 GPM | 0.02101 ac ft/d |
| A fire hydrant | 951 GPM | 4.203 ac ft/d |
| The Thames at London | 1.03e+06 GPM | 4553 ac ft/d |
Published reference values, converted with the same factor this page uses.