To convert cubic feet per hour to cubic meters per hour, multiply by 0.02831684659. 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.
Gas appliance and small-flow rating in the US. The standard rating unit for pumps and ventilation in metric markets.
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. Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into cubic meters per hour, which is usually more useful than the bare number.
The formula
cubic feet per hour- The amount you are converting, in cubic feet per hour
0.028316846592- The exact number of cubic meters per hour in one cubic foot per hour
cubic meters per hour- The converted result
How it works, step by step
- Enter the value in cubic feet per hour.
- It is multiplied by 0.028316846592, the exact factor between the two units.
- The answer is shown in cubic meters 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: 12.7 CFH in cubic meters per hour
Take a bathroom tap, roughly 12.7 CFH. The conversion is a single multiplication — 12.7 × 0.0283168 — giving 0.359624 m³/h. Because the relationship is proportional, doubling the input doubles the answer to 0.719248 m³/h.
A garden hose: 38.1 CFH in cubic meters per hour
At 38.1 CFH (a garden hose), the same quantity in cubic meters per hour is 38.1 × 0.0283168 = 1.07887 m³/h. One cubic foot per hour is 0.0283168 cubic meters per hour, so the numbers shrink as expected.
How to read your score
Frequently asked questions
How many cubic meters per hour are in one cubic foot per hour?
Exactly 0.028316846592. 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 cubic feet per hour to cubic meters per hour?
cubic meters per hour = cubic feet per hour × 0.028316846592. Reversed, cubic feet per hour = cubic meters per hour ÷ 0.028316846592, which is the same as multiplying by 35.3146667215.
Which is the bigger unit, the cubic foot per hour or the cubic meter per hour?
The cubic meter per hour. One cubic foot per hour is only 0.0283168 of a cubic meter per hour, so it takes 35.3147 cubic feet per hour to make one cubic meter 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 cubic foot per hour?
Gas appliance and small-flow rating in the US.
What is a cubic meter per hour?
The standard rating unit for pumps and ventilation in metric markets.
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 CFH to m³/h in my head?
Plenty of people do this in their head: divide by 35 instead of using the exact factor 0.02831684659. At 100 that shortcut gives 2.8571429 cubic meters per hour, off by 0.02546 cubic meters per hour or about 0.90%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Cubic Feet Per Hour to cubic meters per hour reference tables
| Cubic Feet Per Hour | Cubic Meters Per Hour |
|---|---|
| 0.5 CFH | 0.0141584 m³/h |
| 1 CFH | 0.0283168 m³/h |
| 2 CFH | 0.0566337 m³/h |
| 3 CFH | 0.0849505 m³/h |
| 5 CFH | 0.141584 m³/h |
| 10 CFH | 0.283168 m³/h |
| 20 CFH | 0.566337 m³/h |
| 25 CFH | 0.707921 m³/h |
| 50 CFH | 1.41584 m³/h |
| 75 CFH | 2.12376 m³/h |
| 100 CFH | 2.83168 m³/h |
| 250 CFH | 7.07921 m³/h |
| 500 CFH | 14.1584 m³/h |
| 1000 CFH | 28.3168 m³/h |
| 5000 CFH | 141.584 m³/h |
Exact factor: 1 cubic foot per hour = 0.028316846592 cubic meters per hour.
| Quantity | CFH | m³/h |
|---|---|---|
| A dripping tap | 0.01271 CFH | 0.00036 m³/h |
| A bathroom tap | 12.71 CFH | 0.36 m³/h |
| A shower head | 20.34 CFH | 0.576 m³/h |
| A garden hose | 38.14 CFH | 1.08 m³/h |
| A fire hydrant | 7628 CFH | 216 m³/h |
| The Thames at London | 8.264e+06 CFH | 2.34e+05 m³/h |
Published reference values, converted with the same factor this page uses.