Cleave Books
Conversion Calculator for Units of
Type in size . . .

select units . . .
then press

Values are shown to . . . significant figures.

millibars [= hPa]
pascals [Pa]
kilopascals [kPa]
megapascals [MPa]
inches of water
*mm of water
inches of mercury
**mm of mercury
feet of water
kg / cm2
pound / inch2 [psi]
***tonnes / m2
pounds / foot2
newtons / cm2
tons(UK) / foot2
newtons / m2
tons(US) / foot 2
kilonewtons / m2
* 'mm of water' are same value as kg/m2
** 'mm of mercury' are also known as 'torrs'
*** tonnes/m2 are same value as 'metres of water'
**** The 'atmosphere' is absolute.
The 'pound', 'kg', 'ton', etc are all units of force NOT mass.
Unit shown in red is the SI 'preferred' unit.
Very large and very small numbers appear in e-Format and are unspaced.
Unvalued zeros on all numbers have been suppressed.
NO guarantee as to the accuracy of these values is given.
And they should be checked against some other source.
A note on Format and Accuracy is available.
There are also some
Background Notes on Pressure

Go to theDictionary of UnitsOR the Calculator Menu
Version 1.4