Direct conversion
Convert millimeter of mercury [mmHg] to millimeter of water [mmH2O] instantly with formula, examples, chart, and FAQs.
1 millimeter of mercury [mmHg] = 13.5951 millimeter of water [mmH2O]
1 millimeter of mercury [mmHg] = 13.5951 millimeter of water [mmH2O]
Example: 1 millimeter of mercury [mmHg] equals 13.5951 millimeter of water [mmH2O].
Pressure conversions use pascal as the reference unit and include common engineering, weather, tire, and laboratory pressure units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-08-14.
The millimeter of mercury (mmHg) is a pressure unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse millimeter of mercury when comparing pressure values, checking specifications, converting between systems, or preparing quick estimates.
The millimeter of water (mmH2O) is a pressure unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse millimeter of water when comparing pressure values, checking specifications, converting between systems, or preparing quick estimates.
| millimeter of mercury [mmHg] | millimeter of water [mmH2O] |
|---|---|
| 1 | 13.5951 |
| 2 | 27.1902 |
| 5 | 67.9755 |
| 10 | 135.951 |
| 20 | 271.902 |
| 25 | 339.8775 |
| 50 | 679.755 |
| 100 | 1359.51 |
| 1000 | 13595.1 |
Use this formula: 1 millimeter of mercury [mmHg] = 13.5951 millimeter of water [mmH2O] Enter your value in the calculator and the result updates instantly.
1 millimeter of mercury [mmHg] equals 13.5951 millimeter of water [mmH2O].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.