This page converts acre-feet per day into cubic feet per hour using the factor 1815, and shows the reverse figure alongside it. Both units measure volumetric flow, which is why one number does the whole job.
Irrigation and reservoir release rates in the western United States. Gas appliance and small-flow rating in the US.
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 cubic feet per hour, so you can sanity-check whether your answer is a plausible size.
The formula
acre-feet per day- The amount you are converting, in acre-feet per day
1814.99999994- The exact number of cubic feet per hour in one acre-foot per day
cubic feet per hour- The converted result
How it works, step by step
- Enter the value in acre-feet per day.
- It is multiplied by 1814.99999994, the exact factor between the two units.
- The answer is shown in cubic feet per hour, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A bathroom tap: 0.007 ac ft/d in cubic feet per hour
Take a bathroom tap, roughly 0.007 ac ft/d. The conversion is a single multiplication — 0.007 × 1815 — giving 12.705 CFH. Because the relationship is proportional, doubling the input doubles the answer to 25.41 CFH.
A shower head: 0.0112 ac ft/d in cubic feet per hour
A shower head comes to about 0.0112 ac ft/d. Multiplying by the factor: 0.0112 × 1815 = 20.328 CFH. Dividing the answer back by 1815 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many cubic feet per hour are in one acre-foot per day?
Exactly 1814.99999994. 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 acre-feet per day to cubic feet per hour?
cubic feet per hour = acre-feet per day × 1814.99999994. Reversed, acre-feet per day = cubic feet per hour ÷ 1814.99999994, which is the same as multiplying by 0.000550964187346.
Which is the bigger unit, the acre-foot per day or the cubic foot per hour?
The acre-foot per day. One acre-foot per day equals 1815 cubic feet per hour.
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 acre-foot per day?
Irrigation and reservoir release rates in the western United States.
What is a cubic foot per hour?
Gas appliance and small-flow rating in the US.
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 ac ft/d to CFH in my head?
Plenty of people do this in their head: multiply by 1800 instead of using the exact factor 1815. At 100 that shortcut gives 180,000 cubic feet per hour, off by 1500 cubic feet per hour or about 0.83%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Acre-Feet Per Day to cubic feet per hour reference tables
| Acre-Feet Per Day | Cubic Feet Per Hour |
|---|---|
| 0.5 ac ft/d | 907.5 CFH |
| 1 ac ft/d | 1815 CFH |
| 2 ac ft/d | 3630 CFH |
| 3 ac ft/d | 5445 CFH |
| 5 ac ft/d | 9075 CFH |
| 10 ac ft/d | 18,150 CFH |
| 20 ac ft/d | 36,300 CFH |
| 25 ac ft/d | 45,375 CFH |
| 50 ac ft/d | 90,750 CFH |
| 75 ac ft/d | 136,125 CFH |
| 100 ac ft/d | 181,500 CFH |
| 250 ac ft/d | 453,750 CFH |
| 500 ac ft/d | 907,500 CFH |
| 1000 ac ft/d | 1.815e+06 CFH |
| 5000 ac ft/d | 9.075e+06 CFH |
Exact factor: 1 acre-foot per day = 1814.99999994 cubic feet per hour.
| Quantity | ac ft/d | CFH |
|---|---|---|
| A dripping tap | 7.005e-06 ac ft/d | 0.01271 CFH |
| A bathroom tap | 0.007005 ac ft/d | 12.71 CFH |
| A shower head | 0.01121 ac ft/d | 20.34 CFH |
| A garden hose | 0.02101 ac ft/d | 38.14 CFH |
| A fire hydrant | 4.203 ac ft/d | 7628 CFH |
| The Thames at London | 4553 ac ft/d | 8.264e+06 CFH |
Published reference values, converted with the same factor this page uses.