To convert megapascals to feet of water, multiply by 334.5525656. That factor is the whole relationship: both units measure pressure, so the conversion is a proportion with no offset and no substance-specific constant.
Used for material strength and hydraulic systems. Pump head expressed as a column of water — the way pump curves are drawn.
Gauge versus absolute. A tyre gauge reading 32 psi means 32 psi above atmospheric, which is about 46.7 psi absolute. Converting the number is straightforward; remembering which zero it was measured from is where the mistakes happen. N/mm² and MPa are the same size, so a drawing quoting either is quoting the same stress. Below the calculator there is a step table for the values people look up most, and a second table putting real pressure figures into feet of water so the number you get has something to be compared against.
The formula
megapascals- The amount you are converting, in megapascals
334.552565551- The exact number of feet of water in one megapascal
feet of water- The converted result
How it works, step by step
- Enter the value in megapascals.
- It is multiplied by 334.552565551, the exact factor between the two units.
- The answer is shown in feet of water, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Blood pressure, systolic: 0.016 MPa in feet of water
Blood pressure, systolic comes to about 0.016 MPa. Multiplying by the factor: 0.016 × 334.553 = 5.35284 ftH₂O. Dividing the answer back by 334.553 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A car tyre: 0.221 MPa in feet of water
A car tyre comes to about 0.221 MPa. Multiplying by the factor: 0.221 × 334.553 = 73.9361 ftH₂O. Dividing the answer back by 334.553 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 feet of water are in one megapascal?
Exactly 334.552565551. 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 megapascals to feet of water?
feet of water = megapascals × 334.552565551. Reversed, megapascals = feet of water ÷ 334.552565551, which is the same as multiplying by 0.0029890669.
Which is the bigger unit, the megapascal or the foot of water?
The megapascal. One megapascal equals 334.553 feet of water.
What does this quantity actually measure?
Both units measure pressure. 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 megapascal?
Used for material strength and hydraulic systems.
What is a foot of water?
Pump head expressed as a column of water — the way pump curves are drawn.
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 MPa to ftH₂O in my head?
Plenty of people do this in their head: multiply by 330 instead of using the exact factor 334.5525656. At 100 that shortcut gives 33,000 feet of water, off by 455.3 feet of water or about 1.36%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Megapascals to feet of water reference tables
| Megapascals | Feet Of Water |
|---|---|
| 0.5 MPa | 167.276 ftH₂O |
| 1 MPa | 334.553 ftH₂O |
| 2 MPa | 669.105 ftH₂O |
| 3 MPa | 1003.66 ftH₂O |
| 5 MPa | 1672.76 ftH₂O |
| 10 MPa | 3345.53 ftH₂O |
| 20 MPa | 6691.05 ftH₂O |
| 25 MPa | 8363.81 ftH₂O |
| 50 MPa | 16,727.6 ftH₂O |
| 75 MPa | 25,091.4 ftH₂O |
| 100 MPa | 33,455.3 ftH₂O |
| 250 MPa | 83,638.1 ftH₂O |
| 500 MPa | 167,276 ftH₂O |
| 1000 MPa | 334,553 ftH₂O |
| 5000 MPa | 1.67276e+06 ftH₂O |
Exact factor: 1 megapascal = 334.552565551 feet of water.
| Quantity | MPa | ftH₂O |
|---|---|---|
| Sea-level air | 0.1013 MPa | 33.9 ftH₂O |
| A car tyre | 0.2206 MPa | 73.81 ftH₂O |
| Blood pressure, systolic | 0.016 MPa | 5.352 ftH₂O |
| A bicycle tyre | 0.6205 MPa | 207.6 ftH₂O |
| A domestic water main | 0.4 MPa | 133.8 ftH₂O |
| A steam boiler | 1 MPa | 334.6 ftH₂O |
Published reference values, converted with the same factor this page uses.