Inch of water to Millimeter of mercury Converter (and vice versa)
Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026
This converter allows you to convert inches of water [inH₂O] to millimeters of mercury [mmHg, Torr] or millimeters of mercury [mmHg, Torr] to inches of water [inH₂O]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.
Convert inches of water to millimeters of mercury
There are two simple ways to convert inches of water [inH₂O] to millimeters of mercury [mmHg, Torr]. In the first calculation method, the value in inches of water [inH₂O] is divided by the rounded conversion factor of 0.5358. The second method multiplies the value in inches of water [inH₂O] by the rounded conversion factor of 1.8665.
- Millimeters of mercury [mmHg, Torr] ≈ inches of water [inH₂O] ÷ 0.5358
- Millimeters of mercury [mmHg, Torr] ≈ inches of water [inH₂O] * 1.8665
However, rounded conversion values are only suitable for rough conversions, as rounding errors can occur in the calculation result. The most accurate conversion of inches of water [inH₂O] to millimeters of mercury [mmHg, Torr] can be achieved using the following calculation method.
- Millimeters of mercury [mmHg, Torr] = inches of water [inH₂O] * 2,488.4 ÷ 101,325 * 76
Convert millimeters of mercury to inches of water
Converting millimeters of mercury [mmHg, Torr] to inches of water [inH₂O] is easy and can be done in two ways. The first method involves multiplication, in which the value in millimeters of mercury [mmHg, Torr] is multiplied by the rounded conversion factor of 0.5358. The second variant is a division. Here, the value in millimeters of mercury [mmHg, Torr] is divided by the rounded conversion factor of 1.8665.
- Inches of water [inH₂O] ≈ millimeters of mercury [mmHg, Torr] * 0.5358
- Inches of water [inH₂O] ≈ millimeters of mercury [mmHg, Torr] ÷ 1.8665
However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of millimeters of mercury [mmHg, Torr] to inches of water [inH₂O] can be achieved using the following calculation method.
- Inches of water [inH₂O] = millimeters of mercury [mmHg, Torr] ÷ 2,488.4 * 101,325 ÷ 76
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Inches of water
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