Centimeters of water to newtons per square meter conversion calculator shown above calculates how many newtons per square meter are in 'X' centimeters of water (where 'X' is the number of centimeters of water to convert to newtons per square meter). In order to convert a value from centimeters of water to newtons per square meter (from cmH2O to N/m²) simply type the number of cmH2O to be converted to N/m² and then click on the 'convert' button.