Frequently Asked Questions (FAQ)

Here you will find answers to some of the more frequently asked questions about our online calculators and converters.

Are all your calculators free?

Yes, we are committed to providing this service for free. You can use all our online calculators, converters, and random generators to your heart's desire, within reasonable limit.

How can I embed a calculator / converter / randomizer on my site or blog?

Most of our tools are available to be embedded in other sites. Just look for a "Put it on your site!" box near the results of your calculaton. The instructions are very straightforward and require minimum technical expertise. There are some customization options available, but currently our calculators are only available in English.

What are the sources for the formulas used?

The formulas are from textbooks, scientific papers, and other authoritative material. Many calculators would have a reference list, pointing to the specific material used. When there is controversy on which is the correct formula, we do our best to explain the choice of formula, and if possible - provide results for each viable equation.

How to cite

It is easy to cite our site. If you are writing an academic paper, thesis, or even just a course-work/report, the way to cite any of our calculators and information on our calculator pages is displayed near the footer on each page. Just scroll down and look for a "Cite this calculator & page" or "Cite this converter & page" box.

How to report issues or errors?

Despite our best effort some calculators might not function as expected or might produce strange results in boundary cases. If you spot what you believe is an error or a visual bug in our tools, please, contact us and make sure you provide a detailed explanation of the issue.

I need a consultation regarding a particular issue

While we do offer many free tools which can help you solve a range of everyday tasks such as converting a recipe from one metric to another or one serving size to another or calculating the number of tiles you'd need to cover your bathroom floor, as well as a number of highly complex and specialized tasks such as calculating a hazard ratio statistic for the outcome of a clinical trial we do not offer consultations on any of these issues.

If you need help in deciding on the input or in interpreting the results from our calculators, consulting the text below each tool is a good starting point, but in some cases you might ultimately need to enlist the services of a professional consultant.