One acre-foot per day is exactly 0.01427641016 cubic meters per second, so converting acre-feet per day to cubic meters per second is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
Irrigation and reservoir release rates in the western United States. The SI unit of volumetric flow, used for rivers and large ducts.
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 meters per second, 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
0.0142764101563- The exact number of cubic meters per second in one acre-foot per day
cubic meters per second- The converted result
How it works, step by step
- Enter the value in acre-feet per day.
- It is multiplied by 0.0142764101563, the exact factor between the two units.
- The answer is shown in cubic meters per second, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A garden hose: 0.021 ac ft/d in cubic meters per second
A garden hose comes to about 0.021 ac ft/d. Multiplying by the factor: 0.021 × 0.0142764 = 0.000299805 m³/s. Dividing the answer back by 0.0142764 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A shower head: 0.0112 ac ft/d in cubic meters per second
Take a shower head, roughly 0.0112 ac ft/d. The conversion is a single multiplication — 0.0112 × 0.0142764 — giving 0.000159896 m³/s. Because the relationship is proportional, doubling the input doubles the answer to 0.000319792 m³/s.
How to read your score
Frequently asked questions
How many cubic meters per second are in one acre-foot per day?
Exactly 0.0142764101563. 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 meters per second?
cubic meters per second = acre-feet per day × 0.0142764101563. Reversed, acre-feet per day = cubic meters per second ÷ 0.0142764101563, which is the same as multiplying by 70.0456199457.
Which is the bigger unit, the acre-foot per day or the cubic meter per second?
The cubic meter per second. One acre-foot per day is only 0.0142764 of a cubic meter per second, so it takes 70.0456 acre-feet per day to make one cubic meter per second.
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 meter per second?
The SI unit of volumetric flow, used for rivers and large ducts.
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 m³/s in my head?
Plenty of people do this in their head: divide by 70 instead of using the exact factor 0.01427641016. At 100 that shortcut gives 1.4285714 cubic meters per second, off by 0.0009304 cubic meters per second or about 0.07%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Acre-Feet Per Day to cubic meters per second reference tables
| Acre-Feet Per Day | Cubic Meters Per Second |
|---|---|
| 0.5 ac ft/d | 0.00713821 m³/s |
| 1 ac ft/d | 0.0142764 m³/s |
| 2 ac ft/d | 0.0285528 m³/s |
| 3 ac ft/d | 0.0428292 m³/s |
| 5 ac ft/d | 0.0713821 m³/s |
| 10 ac ft/d | 0.142764 m³/s |
| 20 ac ft/d | 0.285528 m³/s |
| 25 ac ft/d | 0.35691 m³/s |
| 50 ac ft/d | 0.713821 m³/s |
| 75 ac ft/d | 1.07073 m³/s |
| 100 ac ft/d | 1.42764 m³/s |
| 250 ac ft/d | 3.5691 m³/s |
| 500 ac ft/d | 7.13821 m³/s |
| 1000 ac ft/d | 14.2764 m³/s |
| 5000 ac ft/d | 71.3821 m³/s |
Exact factor: 1 acre-foot per day = 0.0142764101563 cubic meters per second.
| Quantity | ac ft/d | m³/s |
|---|---|---|
| A dripping tap | 7.005e-06 ac ft/d | 1e-07 m³/s |
| A bathroom tap | 0.007005 ac ft/d | 0.0001 m³/s |
| A shower head | 0.01121 ac ft/d | 0.00016 m³/s |
| A garden hose | 0.02101 ac ft/d | 0.0003 m³/s |
| A fire hydrant | 4.203 ac ft/d | 0.06 m³/s |
| The Thames at London | 4553 ac ft/d | 65 m³/s |
Published reference values, converted with the same factor this page uses.