Inches of mercury to newtons per square meter conversion calculator shown above calculates how many newtons per square meter are in 'X' inches of mercury (where 'X' is the number of inches of mercury to convert to newtons per square meter). In order to convert a value from inches of mercury to newtons per square meter (from inHg to N/m²) type the number of inHg to be converted to N/m² and then click on the 'convert' button.