the calculator home page

Site Information

Contacting us

If you need to contact us about this web site, please send email to our webmaster. You can find out more about Flow Simulation Ltd. at our company web site.


Here are some of the awards that this web site has received: site of the week StudyWeb Academic Excellence Award gbnetx Quality Content Critical Mass award Approved by Schoolzone's team of independent education 

Linking to us

We welcome links to our site. Please feel free to link to us.

We are sorry but we don't do link exchanges. We will link to your site only if the content is relevant.

Terms of Use

While we have made every effort to make the information on this web site as accurate as  possible, the information is  provided in good faith "as is" without any express or implied warranty.  There is no guarantee given as to the completeness accuracy or currency of any information or data on this web site.  Flow Simulation Ltd. does not accept responsibility for any loss or damage caused by use of the  information contained in this web site or any software downloaded from it. Software downloaded from the server is subject to the licensing terms in the Licence Agreement that accompanies the software. All access and use is at the risk of the user.

This web site includes links to other web sites which may be relevant, but which we do not control.   Flow Simulation Ltd. is not responsible for these sites and does not endorse their content.

By using this web site, you consent to these terms and to our Online Privacy Policy and to our processing of personal information for the purposes stated.

Product Pricing and Availability

We reserve the right to change pricing or withdraw products from sale without notice. Whilst we try to ensure the accuracy of prices and product information on our web site, we reserve the right to refuse or cancel any orders if we discover any pricing errors before we process your order, in which case you will be given the option to re-submit your order at the correct price or cancel the order.

All products are subject to availability. If we are unable to deliver the product after you have placed an order, you will be notified by email and given the opportunity to cancel the order or select a substitute product.

Product Support

Please see our product support page.

Except where otherwise stated, the contents of this web site are copyrighted works of Flow Simulation Ltd., all rights reserved, and are for your personal and non-commercial use, such that you may not modify, copy, distribute, transmit, display, perform, reproduce, publish, license, create derivative works from, transfer, or sell any information, software, products or services obtained from this web site.

Some content is sourced from Wikipedia and Pixabay under the Creative Commons licence.

Online Privacy Policy

Please see our extensive Online Privacy Policy for more information.


We have tried to keep the content simple and limited to standard browser features. We have used Javascript only where it is necessary to provide useful functionality, and these pages should still work acceptably even if scripting is disabled (or unsupported) in the browser. We have tried to keep our HTML consistent with W3C recommendations. To some extent this is enforced by our content management system.

These constraints make it more likely that our site will be useable with less common browsers, and accessible to users with disabilities. It should also ensure that our pages load reasonably quickly even on a modest speed internet connection.

Social Bookmarks

Where you see social bookmarking links you can automatically bookmark a page using one of several social bookmarking or social media sites. These sites let you to store, tag and share links across the internet. You can share links with friends and people with similar interests. You can also get to your links from any computer you are using, for example in an internet cafe or when you are away from your desk.


Like any website we have to pay for hosting and other costs, and like most websites, we do this through advertising. We have tried to make our ads as unobtrusive as possible. No annoying popups or greyed out screens; no pages that disappear as you start to read. Here's our full disclosure of what we have:

In Association with

We are an associate. This means that if you follow one of our links to and buy something, we get a small commission. This helps us pay for the free software and services we provide on this site.

Google Adwords logo

Some pages may contain Google advertisements (not very many - you might not even have noticed them). This also results in a small amount of revenue that helps pay for free services. The particular advertisements displayed are chosen by Google, and are usually relevant to the page on which they are shown, but we have no control over what is shown, nor can we take any responsibility for the sites they link to.

We also have some other affiliate partners, and some links will take you to a site with a special link that results in us getting a commission if you buy something on that site (thank you!).

If you have some kind of ad-blocker, those links probably won't work, or may not give us a commission. Oh, well. That's your choice and we respect that.