The website is covered by this disclaimer:
While SQC Online make every effort to deliver high quality solutions, we DO NOT guarantee that our software is free from defects or errors. Our software is provided "as is," and you use the software, including but not limited to the online calculators, at your own risk. We make no warranties as to performance, merchantability, fitness for a particular purpose, or any other warranties whether expressed or implied.
No oral or written communication from or information provided by SQC Online shall create a warranty.
Under no circumstances shall SQC Online be liable for direct, indirect, special, incidental, or consequential damages resulting from the use, misuse, or inability to use this software, even if SQC Online has been advised of the possibility of such damages.