Generally I use SI units (i.e. metric) - their creation was one of Napoleon's better acts, and they are now wtandard internationally for scientific and most engineering work, as well as in most countries.
However there are 3 countries in the world (USA, Libya and the Cayman Islands) who have stuck to what were called Imperial units when I was growing up, i.e. feet, inches and pounds. Also, some countries still use these for some measures, e.g. in the UK traffic speeds are in miles per hour, and older people (like myself) in older countries were initially schooled in these units, and may be more familiar with them than their metric equivalents.
For these reasons, I have drawn up the table below to convert from SI to other units.
|Convert from||To||Do this|
|Metre (m)||Foot (ft or ')||x 0.3048|
|Millimetre (mm)||Inch (in or ")||/ 25.4|
|Square meter (m2)||Square foot ( (ft2 or sq.ft.)||x 0.092903|
|Cubic meter (m3)||Cubic foot ( (ft3 or cu.ft.)||x 0.0283168|
|Litre (l or L)||Cubic meter (m3)||x 0.001|
|Litre (l or L)||Imperial pint||x 1.75975399|
|Litre (l or L)||U.S. pint||x 2.11337641|
|Mass, Weight and Force|
|Kilogram (kg)||Pound (lb)||x 0.453592|
|Newton (N)||Pound-force (lbf)||x 0.22481|
|Density (kg/m3)||Pounds per cubic foot (lb/ft3)||/ 16.0185|
|Pascal (Pa)||Pounds per square inch (psi)||x 0.000145038|
|Kelvin (K)||Degrees Celsius or centigrade (°C)||-273.15|
|Degrees Celsius or centigrade (°C)||Degrees Fahrenheit (°F)||x 1.8 + 32|
|Joule (J)||foot-pound||/ 1.356|
|Joule (J)||British thermal unit (Btu)||/ 1055|
|Watt (W)||horsepower||/ 745.7|
|Heat and Insulation|
|RSI (K.m2/W or °C.m2/W)||R (°F.ft2.h/Btu)||x 5.67826|
|Specific heat capacity (J.kg-1.K-1 or J.kg-1.°C-1)||Btu.lb-1.°F-1)||/ 4177.6|
|Thermal conductivity (W.m-1.K-1 or W.m-1.°C-1)||Btu.h-1.ft-1.°F-1)||/ 1.730735|
Tim Thornton Ceramics Technical by Tim Thornton is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Permissions beyond the scope of this license may be available at https://tim-thornton.com/tikiwiki/tiki-index.php?page=Licence.
If you re-use any material from this web site, you must include an attribution statement as described in the licence, and state if the work has been altered.
You may release work that modifies or builds upon this work only under the same licence (or a compatable one, as defined in the licence).
This licence does not permit you to use this work for commercial purposes, i.e. for commercial advantage or monetary gain. If you wish to use the work in this way, please contact us to discuss it. You will need our prior permission and approval to do this.
Whilst we aim to ensure that all material is accurate at the time of publication, we do not accept responsibility for decisions based on information we make available. No content of this site may be taken to be legal or medical advice.
Please bear in mind that materials on the website are the most up to date versions, but items you have downloaded in the past may not be. The materials are updated from time to time. We recommend that you use the latest versions by referring to those published on our website.
Images – Images are not available for re use under the OGL because in most cases copyright is held by a third party. The Council does not grant anyone any rights to re use images.
Use of logos – The use of Tim Thornton’s logos on any document or in association with any information, signifies that the document or information has been prepared or approved by him. The logos are to be used only when reproducing materials unaltered from the web site, to show their original source. If you wish to use the logo in any other way, please contact us first to obtain permission.
Third party intellectual property/copyright – We do not have the legal authority to grant permission to re use documents where legal rights are owned by third parties.
If you wish to make a specific application to re use information which does not conform with the CC BY-NC-SA 4.0 licence terms, please contact us to ask permission and for details of what, if any, additional conditions and/or charges may apply. Your application should be in writing, specifying your name and address and, identifying the information source you want to re-use and the purpose for re-use.
Whilst every care has been taken in the compilation of this website, and every attempt made to present up-to-date and accurate information, we cannot guarantee that inaccuracies will not occur. We will not be held responsible for any loss, damage or inconvenience caused as a result of any inaccuracy or error within these pages.
Links from our site may lead to pages maintained by other organisations. These are provided purely for your convenience, and do not imply that we endorse or support those organisations, the information on their pages, or their products or services in any way. Additionally, no responsibility is assumed by us for the contents of its pages.