Convert Pascal to Inch of mercury
1 pascal = 0.0002952998 inch of mercury (inHg). For example, 10 pascal = 0.002952998 inch of mercury and 100 pascal = 0.02952998 inch of mercury. Type any value below to convert pascal to inch of mercury both ways — it runs entirely in your browser.
Quick answer: Pascal to Inch of mercury
1 Pascal = 0.0002952998 Inch of mercury (Pa → inHg). To convert pascal to inch of mercury, multiply by 0.0002952998. To convert inch of mercury to pascal, multiply by 3,386.389. 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 mercury questions.
How to convert Pascal to Inch of mercury
To convert pascal to inch of mercury, multiply the number of pascal by the conversion factor 0.0002952998, because 1 Pa = 0.0002952998 inHg. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 inHg = 3,386.389 Pa, so you divide by 0.0002952998 (or multiply by 3,386.389) to turn inch of mercury back into pascal.
inHg = Pa × 0.0002952998 ·
Pa = inHg × 3,386.389
- Write down the value you want to convert, in pascal.
- Multiply it by 0.0002952998.
- The result is the same area/length/quantity expressed in inch of mercury.
Pascal to Inch of mercury — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 pascal is 0.001476499 inch of mercury because 5 Pa × 0.0002952998 = 0.001476499 inHg.
| Pascal | Calculation | Inch of mercury |
|---|---|---|
| 1 Pa | 1 Pa × 0.0002952998 = 0.0002952998 inHg | 0.0002952998 inHg |
| 2 Pa | 2 Pa × 0.0002952998 = 0.0005905997 inHg | 0.0005905997 inHg |
| 3 Pa | 3 Pa × 0.0002952998 = 0.0008858995 inHg | 0.0008858995 inHg |
| 5 Pa | 5 Pa × 0.0002952998 = 0.001476499 inHg | 0.001476499 inHg |
| 7 Pa | 7 Pa × 0.0002952998 = 0.002067099 inHg | 0.002067099 inHg |
| 10 Pa | 10 Pa × 0.0002952998 = 0.002952998 inHg | 0.002952998 inHg |
| 12 Pa | 12 Pa × 0.0002952998 = 0.003543598 inHg | 0.003543598 inHg |
| 15 Pa | 15 Pa × 0.0002952998 = 0.004429497 inHg | 0.004429497 inHg |
| 20 Pa | 20 Pa × 0.0002952998 = 0.005905997 inHg | 0.005905997 inHg |
| 25 Pa | 25 Pa × 0.0002952998 = 0.007382496 inHg | 0.007382496 inHg |
| 50 Pa | 50 Pa × 0.0002952998 = 0.01476499 inHg | 0.01476499 inHg |
| 100 Pa | 100 Pa × 0.0002952998 = 0.02952998 inHg | 0.02952998 inHg |
Common Pascal to Inch of mercury conversions
These are the pascal-to-inch of mercury 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 = 0.0002952998 inch of mercury
- 2 pascal = 0.0005905997 inch of mercury
- 2.5 pascal = 0.0007382496 inch of mercury
- 3 pascal = 0.0008858995 inch of mercury
- 4 pascal = 0.001181199 inch of mercury
- 5 pascal = 0.001476499 inch of mercury
- 6 pascal = 0.001771799 inch of mercury
- 7 pascal = 0.002067099 inch of mercury
- 8 pascal = 0.002362399 inch of mercury
- 9 pascal = 0.002657698 inch of mercury
- 10 pascal = 0.002952998 inch of mercury
- 12 pascal = 0.003543598 inch of mercury
- 15 pascal = 0.004429497 inch of mercury
- 20 pascal = 0.005905997 inch of mercury
- 25 pascal = 0.007382496 inch of mercury
- 30 pascal = 0.008858995 inch of mercury
- 50 pascal = 0.01476499 inch of mercury
- 75 pascal = 0.02214749 inch of mercury
- 100 pascal = 0.02952998 inch of mercury
- 200 pascal = 0.05905997 inch of mercury
- 500 pascal = 0.1476499 inch of mercury
- 1000 pascal = 0.2952998 inch of mercury
Pascal to Inch of mercury conversion chart (both directions)
The chart below converts pascal to inch of mercury and inch of mercury to pascal side by side, so it works whichever way you need. 1 pascal = 0.0002952998 inch of mercury, and 1 inch of mercury = 3,386.389 pascal.
| Pascal → Inch of mercury | Inch of mercury → Pascal |
|---|---|
| 0.25 Pa = 0.00007382496 inHg | 0.25 inHg = 846.5972 Pa |
| 0.5 Pa = 0.0001476499 inHg | 0.5 inHg = 1,693.194 Pa |
| 1 Pa = 0.0002952998 inHg | 1 inHg = 3,386.389 Pa |
| 2 Pa = 0.0005905997 inHg | 2 inHg = 6,772.777 Pa |
| 3 Pa = 0.0008858995 inHg | 3 inHg = 10,159.17 Pa |
| 4 Pa = 0.001181199 inHg | 4 inHg = 13,545.55 Pa |
| 5 Pa = 0.001476499 inHg | 5 inHg = 16,931.94 Pa |
| 6 Pa = 0.001771799 inHg | 6 inHg = 20,318.33 Pa |
| 7 Pa = 0.002067099 inHg | 7 inHg = 23,704.72 Pa |
| 8 Pa = 0.002362399 inHg | 8 inHg = 27,091.11 Pa |
| 9 Pa = 0.002657698 inHg | 9 inHg = 30,477.5 Pa |
| 10 Pa = 0.002952998 inHg | 10 inHg = 33,863.89 Pa |
| 12 Pa = 0.003543598 inHg | 12 inHg = 40,636.66 Pa |
| 15 Pa = 0.004429497 inHg | 15 inHg = 50,795.83 Pa |
| 20 Pa = 0.005905997 inHg | 20 inHg = 67,727.77 Pa |
| 25 Pa = 0.007382496 inHg | 25 inHg = 84,659.72 Pa |
| 30 Pa = 0.008858995 inHg | 30 inHg = 101,591.7 Pa |
| 40 Pa = 0.01181199 inHg | 40 inHg = 135,455.5 Pa |
| 50 Pa = 0.01476499 inHg | 50 inHg = 169,319.4 Pa |
| 75 Pa = 0.02214749 inHg | 75 inHg = 253,979.1 Pa |
| 100 Pa = 0.02952998 inHg | 100 inHg = 338,638.9 Pa |
| 150 Pa = 0.04429497 inHg | 150 inHg = 507,958.3 Pa |
| 200 Pa = 0.05905997 inHg | 200 inHg = 677,277.7 Pa |
| 250 Pa = 0.07382496 inHg | 250 inHg = 846,597.2 Pa |
| 500 Pa = 0.1476499 inHg | 500 inHg = 1,693,194 Pa |
| 1000 Pa = 0.2952998 inHg | 1000 inHg = 3,386,389 Pa |
Pascal vs Inch of mercury: which is bigger?
A inch of mercury is the larger unit: one inch of mercury equals 3,386.389 pascals. Put another way, you need 3,386.389 pascals to make a single inch of mercury.
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 mercury? History, origin and usage
Inches of mercury come from the same barometers as millimetres of mercury, read off in imperial units. The unit stayed embedded in North American practice long after the metric system spread elsewhere, largely because aviation and broadcast weather standardised on it early and changing would have meant reissuing every altimeter and every chart.
Inches of mercury are used for atmospheric pressure in United States weather reports and, importantly, for altimeter settings in aviation in the US and Canada. They also appear on vacuum gauges for engines and air-conditioning work.
The standard sea-level pressure of 29.92 inHg is one of the most recognisable numbers in aviation — pilots set it as the default altimeter reference. An inch of mercury is exactly 25.4 millimetres of mercury, because the inch itself has been exactly 25.4 mm since 1959.
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 mercury to other units
One inch of mercury (inHg) is equal to:
| 1 Inch of mercury equals | Unit |
|---|---|
| 3,386.389 Pa | Pascal |
| 33.86389 hPa | Hectopascal |
| 3.386389 kPa | Kilopascal |
| 0.003386389 MPa | Megapascal |
| 33.86389 mbar | Millibar |
| 0.03386389 bar | Bar |
| 0.03342106 atm | Standard atmosphere |
| 25.4 Torr | Torr |
| 25.4 mmHg | Millimetre of mercury |
| 345.3155 mmH₂O | Millimetre of water |
| 13.5951 inH₂O | Inch of water |
| 0.4911541 psi | Pound per square inch |
| 0.03453155 kgf/cm² | Kilogram-force per square centimetre |
Tips for converting Pascal to Inch of mercury
- To go from pascal to inch of mercury, multiply by 0.0002952998; to go back, divide by 0.0002952998 (or multiply by 3,386.389).
- For a quick mental estimate, remember that 1 pascal ≈ 0.0002952998 inch of mercury, so 10 pascal ≈ 0.002952998 inch of mercury.
- 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 mercury converter
Type a number into the Pascal field and the equivalent in Inch of mercury 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 mercury field to convert the other way (inch of mercury 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 = 0.0002952998 inHg), 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 mercury 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 mercury are in 1 pascal?
- 1 pascal = 0.0002952998 inch of mercury (inHg). To convert any number of pascal to inch of mercury, multiply by 0.0002952998.
- How do I convert pascal to inch of mercury?
- Multiply the number of pascal by 0.0002952998. For example, 10 pascal = 10 × 0.0002952998 = 0.002952998 inch of mercury, and 25 pascal = 0.007382496 inch of mercury.
- How many pascal are in 1 inch of mercury?
- 1 inch of mercury = 3,386.389 pascal. So to convert inch of mercury back to pascal, multiply by 3,386.389.
- What is the formula to convert pascal to inch of mercury?
- inch of mercury = pascal × 0.0002952998. The reverse formula is pascal = inch of mercury × 3,386.389.
- How much is 100 pascal in inch of mercury?
- 100 pascal = 0.02952998 inch of mercury. (And 1000 pascal = 0.2952998 inch of mercury.)
- Which is bigger, a pascal or a inch of mercury?
- A inch of mercury is larger: 1 inch of mercury = 3,386.389 pascal.
- Is this pascal to inch of mercury converter accurate?
- Yes — every value is computed from the exact 0.0002952998 inHg per Pa factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert inch of mercury to pascal too?
- Yes. The converter works both ways — enter a value in either field. 1 inch of mercury = 3,386.389 pascal.