Convert Pascal to Inch of water
1 pascal = 0.004014631 inch of water (inH₂O). For example, 10 pascal = 0.04014631 inch of water and 100 pascal = 0.4014631 inch of water. Type any value below to convert pascal to inch of water both ways — it runs entirely in your browser.
Quick answer: Pascal to Inch of water
1 Pascal = 0.004014631 Inch of water (Pa → inH₂O). To convert pascal to inch of water, multiply by 0.004014631. To convert inch of water to pascal, multiply by 249.0889. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common pascal-to-inch of water questions.
How to convert Pascal to Inch of water
To convert pascal to inch of water, multiply the number of pascal by the conversion factor 0.004014631, because 1 Pa = 0.004014631 inH₂O. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 inH₂O = 249.0889 Pa, so you divide by 0.004014631 (or multiply by 249.0889) to turn inch of water back into pascal.
inH₂O = Pa × 0.004014631 ·
Pa = inH₂O × 249.0889
- Write down the value you want to convert, in pascal.
- Multiply it by 0.004014631.
- The result is the same area/length/quantity expressed in inch of water.
Pascal to Inch of water — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 pascal is 0.02007315 inch of water because 5 Pa × 0.004014631 = 0.02007315 inH₂O.
| Pascal | Calculation | Inch of water |
|---|---|---|
| 1 Pa | 1 Pa × 0.004014631 = 0.004014631 inH₂O | 0.004014631 inH₂O |
| 2 Pa | 2 Pa × 0.004014631 = 0.008029262 inH₂O | 0.008029262 inH₂O |
| 3 Pa | 3 Pa × 0.004014631 = 0.01204389 inH₂O | 0.01204389 inH₂O |
| 5 Pa | 5 Pa × 0.004014631 = 0.02007315 inH₂O | 0.02007315 inH₂O |
| 7 Pa | 7 Pa × 0.004014631 = 0.02810242 inH₂O | 0.02810242 inH₂O |
| 10 Pa | 10 Pa × 0.004014631 = 0.04014631 inH₂O | 0.04014631 inH₂O |
| 12 Pa | 12 Pa × 0.004014631 = 0.04817557 inH₂O | 0.04817557 inH₂O |
| 15 Pa | 15 Pa × 0.004014631 = 0.06021946 inH₂O | 0.06021946 inH₂O |
| 20 Pa | 20 Pa × 0.004014631 = 0.08029262 inH₂O | 0.08029262 inH₂O |
| 25 Pa | 25 Pa × 0.004014631 = 0.1003658 inH₂O | 0.1003658 inH₂O |
| 50 Pa | 50 Pa × 0.004014631 = 0.2007315 inH₂O | 0.2007315 inH₂O |
| 100 Pa | 100 Pa × 0.004014631 = 0.4014631 inH₂O | 0.4014631 inH₂O |
Common Pascal to Inch of water conversions
These are the pascal-to-inch of water values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 pascal = 0.004014631 inch of water
- 2 pascal = 0.008029262 inch of water
- 2.5 pascal = 0.01003658 inch of water
- 3 pascal = 0.01204389 inch of water
- 4 pascal = 0.01605852 inch of water
- 5 pascal = 0.02007315 inch of water
- 6 pascal = 0.02408778 inch of water
- 7 pascal = 0.02810242 inch of water
- 8 pascal = 0.03211705 inch of water
- 9 pascal = 0.03613168 inch of water
- 10 pascal = 0.04014631 inch of water
- 12 pascal = 0.04817557 inch of water
- 15 pascal = 0.06021946 inch of water
- 20 pascal = 0.08029262 inch of water
- 25 pascal = 0.1003658 inch of water
- 30 pascal = 0.1204389 inch of water
- 50 pascal = 0.2007315 inch of water
- 75 pascal = 0.3010973 inch of water
- 100 pascal = 0.4014631 inch of water
- 200 pascal = 0.8029262 inch of water
- 500 pascal = 2.007315 inch of water
- 1000 pascal = 4.014631 inch of water
Pascal to Inch of water conversion chart (both directions)
The chart below converts pascal to inch of water and inch of water to pascal side by side, so it works whichever way you need. 1 pascal = 0.004014631 inch of water, and 1 inch of water = 249.0889 pascal.
| Pascal → Inch of water | Inch of water → Pascal |
|---|---|
| 0.25 Pa = 0.001003658 inH₂O | 0.25 inH₂O = 62.27223 Pa |
| 0.5 Pa = 0.002007315 inH₂O | 0.5 inH₂O = 124.5445 Pa |
| 1 Pa = 0.004014631 inH₂O | 1 inH₂O = 249.0889 Pa |
| 2 Pa = 0.008029262 inH₂O | 2 inH₂O = 498.1778 Pa |
| 3 Pa = 0.01204389 inH₂O | 3 inH₂O = 747.2667 Pa |
| 4 Pa = 0.01605852 inH₂O | 4 inH₂O = 996.3556 Pa |
| 5 Pa = 0.02007315 inH₂O | 5 inH₂O = 1,245.445 Pa |
| 6 Pa = 0.02408778 inH₂O | 6 inH₂O = 1,494.533 Pa |
| 7 Pa = 0.02810242 inH₂O | 7 inH₂O = 1,743.622 Pa |
| 8 Pa = 0.03211705 inH₂O | 8 inH₂O = 1,992.711 Pa |
| 9 Pa = 0.03613168 inH₂O | 9 inH₂O = 2,241.8 Pa |
| 10 Pa = 0.04014631 inH₂O | 10 inH₂O = 2,490.889 Pa |
| 12 Pa = 0.04817557 inH₂O | 12 inH₂O = 2,989.067 Pa |
| 15 Pa = 0.06021946 inH₂O | 15 inH₂O = 3,736.334 Pa |
| 20 Pa = 0.08029262 inH₂O | 20 inH₂O = 4,981.778 Pa |
| 25 Pa = 0.1003658 inH₂O | 25 inH₂O = 6,227.223 Pa |
| 30 Pa = 0.1204389 inH₂O | 30 inH₂O = 7,472.667 Pa |
| 40 Pa = 0.1605852 inH₂O | 40 inH₂O = 9,963.556 Pa |
| 50 Pa = 0.2007315 inH₂O | 50 inH₂O = 12,454.45 Pa |
| 75 Pa = 0.3010973 inH₂O | 75 inH₂O = 18,681.67 Pa |
| 100 Pa = 0.4014631 inH₂O | 100 inH₂O = 24,908.89 Pa |
| 150 Pa = 0.6021946 inH₂O | 150 inH₂O = 37,363.34 Pa |
| 200 Pa = 0.8029262 inH₂O | 200 inH₂O = 49,817.78 Pa |
| 250 Pa = 1.003658 inH₂O | 250 inH₂O = 62,272.23 Pa |
| 500 Pa = 2.007315 inH₂O | 500 inH₂O = 124,544.5 Pa |
| 1000 Pa = 4.014631 inH₂O | 1000 inH₂O = 249,088.9 Pa |
Pascal vs Inch of water: which is bigger?
A inch of water is the larger unit: one inch of water equals 249.0889 pascals. Put another way, you need 249.0889 pascals to make a single inch of water.
What is a Pascal? History, origin and usage
The pascal is named after Blaise Pascal, who in 1648 had his brother-in-law carry a mercury barometer up the Puy de Dôme in central France and watch the mercury column fall as he climbed. That experiment showed air has weight and that the pressure it exerts drops with height. The unit itself is much younger: the name was adopted by the General Conference on Weights and Measures in 1971, replacing the older habit of writing pressures as "newtons per square metre".
The pascal is the SI unit of pressure and the base every other unit on this page is defined against. On its own it is awkwardly small for daily life — a sheet of paper resting on a table presses down with only a few pascals — so real-world figures are almost always given with a prefix: hectopascals for weather, kilopascals for tyres and gas, megapascals for concrete and hydraulics.
One pascal is one newton spread over one square metre, which is about the pressure of a five-rupee coin lying flat on a table. Because pressure is force divided by area, the same push concentrated into a smaller area gives a much higher pressure — which is why a drawing pin goes into a wall and your thumb does not.
What is a Inch of water? History, origin and usage
The inch of water is the imperial counterpart of the millimetre of water, and it became entrenched in North American heating and ventilation practice, where it is usually written "inches WC" for water column. Gas utilities adopted it because household gas supply pressures are small enough that a water manometer reads them comfortably.
Inches of water are used for duct pressure and fan static pressure in heating and air-conditioning, for natural-gas appliance supply pressure, and for cleanroom and filter differential pressures.
Residential natural gas is typically delivered at around 7 inches of water column — a pressure so low that it would barely register on a tyre gauge. An inch of water is exactly 25.4 millimetres of water.
Convert 1 Pascal to other units
It can help to see a pascal next to the other units it is commonly compared with. One pascal (Pa) is equal to:
| 1 Pascal equals | Unit |
|---|---|
| 0.01 hPa | Hectopascal |
| 0.001 kPa | Kilopascal |
| 0.000001 MPa | Megapascal |
| 0.01 mbar | Millibar |
| 0.00001 bar | Bar |
| 0.000009869233 atm | Standard atmosphere |
| 0.007500617 Torr | Torr |
| 0.007500616 mmHg | Millimetre of mercury |
| 0.0002952998 inHg | Inch of mercury |
| 0.1019716 mmH₂O | Millimetre of water |
| 0.004014631 inH₂O | Inch of water |
| 0.0001450377 psi | Pound per square inch |
| 0.00001019716 kgf/cm² | Kilogram-force per square centimetre |
Convert 1 Inch of water to other units
One inch of water (inH₂O) is equal to:
| 1 Inch of water equals | Unit |
|---|---|
| 249.0889 Pa | Pascal |
| 2.490889 hPa | Hectopascal |
| 0.2490889 kPa | Kilopascal |
| 0.0002490889 MPa | Megapascal |
| 2.490889 mbar | Millibar |
| 0.002490889 bar | Bar |
| 0.002458316 atm | Standard atmosphere |
| 1.86832 Torr | Torr |
| 1.86832 mmHg | Millimetre of mercury |
| 0.07355591 inHg | Inch of mercury |
| 25.4 mmH₂O | Millimetre of water |
| 0.03612729 psi | Pound per square inch |
| 0.00254 kgf/cm² | Kilogram-force per square centimetre |
Tips for converting Pascal to Inch of water
- To go from pascal to inch of water, multiply by 0.004014631; to go back, divide by 0.004014631 (or multiply by 249.0889).
- For a quick mental estimate, remember that 1 pascal ≈ 0.004014631 inch of water, so 10 pascal ≈ 0.04014631 inch of water.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Pascal to Inch of water converter
Type a number into the Pascal field and the equivalent in Inch of water appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Inch of water field to convert the other way (inch of water to pascal). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 Pa = 0.004014631 inH₂O), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for pascal-to-inch of water conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- NIST Special Publication 811 — Guide for the Use of the SI — publishes the exact metric equivalents of the customary pressure units. A psi is one pound of force over one square inch, and the 1959 international yard-and-pound agreement fixes the pound at exactly 0.453 592 37 kilogram and the inch at exactly 0.0254 metre, while standard gravity is fixed at exactly 9.806 65 m/s² — so psi, inches of mercury and inches of water are defined exactly rather than measured.
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
Pressure factors here come from fixed definitions, anchored to the pascal: a bar is exactly 100,000 Pa, one atmosphere is exactly 101,325 Pa, a torr is exactly a 760th of an atmosphere, and psi is built from the exact pound and the exact inch. Two of them — psi and the torr — work out to decimals that repeat forever, so where a number is shown rounded it is marked, not quietly trimmed.
Frequently asked questions
- How many inch of water are in 1 pascal?
- 1 pascal = 0.004014631 inch of water (inH₂O). To convert any number of pascal to inch of water, multiply by 0.004014631.
- How do I convert pascal to inch of water?
- Multiply the number of pascal by 0.004014631. For example, 10 pascal = 10 × 0.004014631 = 0.04014631 inch of water, and 25 pascal = 0.1003658 inch of water.
- How many pascal are in 1 inch of water?
- 1 inch of water = 249.0889 pascal. So to convert inch of water back to pascal, multiply by 249.0889.
- What is the formula to convert pascal to inch of water?
- inch of water = pascal × 0.004014631. The reverse formula is pascal = inch of water × 249.0889.
- How much is 100 pascal in inch of water?
- 100 pascal = 0.4014631 inch of water. (And 1000 pascal = 4.014631 inch of water.)
- Which is bigger, a pascal or a inch of water?
- A inch of water is larger: 1 inch of water = 249.0889 pascal.
- Is this pascal to inch of water converter accurate?
- Yes — every value is computed from the exact 0.004014631 inH₂O per Pa factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert inch of water to pascal too?
- Yes. The converter works both ways — enter a value in either field. 1 inch of water = 249.0889 pascal.