One US gallon per day is exactly 4.381262735e-08 cubic meters per second, so converting US gallons 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.
The rating unit for reverse-osmosis membranes and water demand. 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. Below the calculator there is a step table for the values people look up most, and a second table putting real volumetric flow figures into cubic meters per second so the number you get has something to be compared against.
The formula
US gallons per day- The amount you are converting, in US gallons per day
4.38126273536e-08- The exact number of cubic meters per second in one US gallon per day
cubic meters per second- The converted result
How it works, step by step
- Enter the value in US gallons per day.
- It is multiplied by 4.38126273536e-08, 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: 6850 GPD in cubic meters per second
At 6850 GPD (a garden hose), the same quantity in cubic meters per second is 6850 × 4.38126e-08 = 0.000300116 m³/s. One US gallon per day is 4.38126e-08 cubic meters per second, so the numbers shrink as expected.
A dripping tap: 2.28 GPD in cubic meters per second
A dripping tap comes to about 2.28 GPD. Multiplying by the factor: 2.28 × 4.38126e-08 = 9.98928e-08 m³/s. Dividing the answer back by 4.38126e-08 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 meters per second are in one US gallon per day?
Exactly 4.38126273536e-08. 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 day to cubic meters per second?
cubic meters per second = US gallons per day × 4.38126273536e-08. Reversed, US gallons per day = cubic meters per second ÷ 4.38126273536e-08, which is the same as multiplying by 22,824,470.0307.
Which is the bigger unit, the US gallon per day or the cubic meter per second?
The cubic meter per second. One US gallon per day is only 4.38126e-08 of a cubic meter per second, so it takes 2.28245e+07 US gallons 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 US gallon per day?
The rating unit for reverse-osmosis membranes and water demand.
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 GPD to m³/s in my head?
Plenty of people do this in their head: divide by 23000000.000000 instead of using the exact factor 4.3813e-08. At 100 that shortcut gives 0.000004 cubic meters per second, off by 3.3437e-08 cubic meters per second or about 0.76%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Us Gallons Per Day to cubic meters per second reference tables
| Us Gallons Per Day | Cubic Meters Per Second |
|---|---|
| 0.5 GPD | 2.19063e-08 m³/s |
| 1 GPD | 4.38126e-08 m³/s |
| 2 GPD | 8.76253e-08 m³/s |
| 3 GPD | 1.31438e-07 m³/s |
| 5 GPD | 2.19063e-07 m³/s |
| 10 GPD | 4.38126e-07 m³/s |
| 20 GPD | 8.76253e-07 m³/s |
| 25 GPD | 1.09532e-06 m³/s |
| 50 GPD | 2.19063e-06 m³/s |
| 75 GPD | 3.28595e-06 m³/s |
| 100 GPD | 4.38126e-06 m³/s |
| 250 GPD | 1.09532e-05 m³/s |
| 500 GPD | 2.19063e-05 m³/s |
| 1000 GPD | 4.38126e-05 m³/s |
| 5000 GPD | 0.000219063 m³/s |
Exact factor: 1 US gallon per day = 4.38126273536e-08 cubic meters per second.
| Quantity | GPD | m³/s |
|---|---|---|
| A dripping tap | 2.282 GPD | 1e-07 m³/s |
| A bathroom tap | 2282 GPD | 0.0001 m³/s |
| A shower head | 3652 GPD | 0.00016 m³/s |
| A garden hose | 6847 GPD | 0.0003 m³/s |
| A fire hydrant | 1.369e+06 GPD | 0.06 m³/s |
| The Thames at London | 1.484e+09 GPD | 65 m³/s |
Published reference values, converted with the same factor this page uses.