inHg to MPa Converter

How to convert inches of mercury to megapascals

FormulaMPa = inHg × 0.00338638864

Multiply the value in inches of mercury by 0.00338638864. To go the other way, multiply by 295.299833 (or divide by 0.00338638864).

An inch of mercury is smaller than a megapascal: it takes 295.299833 inches of mercury to make one megapascal.

Worked examples

1 inch of mercury1 inHg × 0.00338638864 = 0.00338638864 MPa
5 inches of mercury5 inHg × 0.00338638864 = 0.0169319432 MPa
10 inches of mercury10 inHg × 0.00338638864 = 0.0338638864 MPa
20 inches of mercury20 inHg × 0.00338638864 = 0.06772777281 MPa
100 inches of mercury100 inHg × 0.00338638864 = 0.338638864 MPa

Inches of mercury to megapascals conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Inches of mercury to megapascals: 0.1–10 inHg
Inches of mercury (inHg)	Megapascals (MPa)
0.1 inHg	0.00033863886 MPa
0.25 inHg	0.00084659716 MPa
0.5 inHg	0.0016931943 MPa
1 inHg	0.0033863886 MPa
2 inHg	0.0067727773 MPa
3 inHg	0.010159166 MPa
4 inHg	0.013545555 MPa
5 inHg	0.016931943 MPa
6 inHg	0.020318332 MPa
7 inHg	0.02370472 MPa
8 inHg	0.027091109 MPa
9 inHg	0.030477498 MPa
10 inHg	0.033863886 MPa

Inches of mercury to megapascals: 12–1,000 inHg
Inches of mercury (inHg)	Megapascals (MPa)
12 inHg	0.040636664 MPa
15 inHg	0.05079583 MPa
20 inHg	0.067727773 MPa
25 inHg	0.084659716 MPa
30 inHg	0.10159166 MPa
40 inHg	0.13545555 MPa
50 inHg	0.16931943 MPa
75 inHg	0.25397915 MPa
100 inHg	0.33863886 MPa
250 inHg	0.84659716 MPa
500 inHg	1.6931943 MPa
1,000 inHg	3.3863886 MPa

About the units

Inch of mercury (inHg)

About 3,386.39 Pa. US weather reports and aircraft altimeters use inches of mercury (standard is 29.92 inHg). One inch of mercury equals 3,386.38864 pascals (Pa).

Megapascal (MPa)

One million pascals, equal to 1 N/mm². Concrete and steel strengths are given in MPa. One megapascal equals 1,000,000 pascals (Pa).

Frequently asked questions

How many megapascals are in one inch of mercury?

There are 0.00338638864 megapascals in one inch of mercury, and this value is exact by definition.

How do I convert inches of mercury to megapascals?

Multiply the number of inches of mercury by 0.00338638864. For example, 10 inHg × 0.00338638864 = 0.0338638864 MPa.

How many inches of mercury are in one megapascal?

One megapascal equals 295.299833 inches of mercury. That is the reverse factor, 1 ÷ 0.00338638864.

What is 10 inches of mercury in megapascals?

10 inHg = 0.0338638864 MPa.

Is this inHg to MPa converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.