mmHg to Kilopascal Converter

How it is calculated

The tool multiplies the pressure in millimetres of mercury by a fixed factor: kPa = mmHg × 0.1333223684. From the kilopascal figure it also derives Pa = kPa × 1000 and bar = kPa ÷ 100. The three results are rounded differently: kilopascals to four decimals, pascals to two decimals and bar to six decimals. The factor is a constant, so the conversion is exactly proportional: doubling the mmHg value doubles every result. Zero and negative values are accepted (a negative value is simply converted to a negative pressure, as with a gauge reading below atmospheric), and nothing else is checked. The tool converts only the number you type; it does not know whether it is a blood pressure, a gas pressure or a barometer reading. As a check, 760 mmHg converts to 101.3250 kPa, the standard atmosphere.

Common mistakes

• Dividing by the factor instead of multiplying. To go from mmHg to kPa you multiply by about 0.1333; dividing gives a number about 56 times too large. The other direction, kPa to mmHg, divides.
• Converting a blood pressure pair as one number. 120/80 are two separate pressures: enter 120 and 80 one after the other, which gives about 16.0 kPa and 10.7 kPa.
• Treating kPa and bar as the same size. 1 bar is 100 kPa, so a result of 0.159987 bar is not 16 bar.
• Reading the rounded kPa value as exact when many decimals matter. The kPa figure is rounded to four decimals, so use the pascal figure when you need more precision.
• Entering a value in cmH₂O or inches of mercury into the mmHg field. These are different units with different factors.