# Contact Us

If you have any questions or comments about Good Calculators, please use the form below to contact us.

## Other Contact Information

Author, Webmaster: **John Sanders** ( goodcalculators [at] gmail [dot] com ),
**Andrew Stacy** ( support [at] goodcalculators [dot] com )

### About Us

As fervent IT professionals, we wanted to create a platform that would allow us to share free online calculators for everyone to utilize. This site boasts a comprehensive collection of tools, ranging from simple to complex engineering calculators.

**Here are a few facts about the calculators you will find on our website:**

- Our team has internally developed more than 98% of the calculators we provide.
- Over 90% of the calculators are based on well-known formulas or equations (i.e. mortgage and loan calculators, BMI calculator, math and engineering calculators, etc.)
- Some calculators use open-source JavaScript components under various open-source licenses

**Our rights to the material provided are below:**

Much of the descriptive content was developed internally by our team of specialists. However, approximately 5% of the content was used from Wikipedia.org under the GNU Free Documentation License.

The content description of the financial calculators was created and/or reviewed by our financial advisors with actual data from the following public sites: www.irs.gov and www.gov.uk

All other content descriptions were created by our team of engineers.

### Terms of Use

By using our services, you agree to be bound by the following terms and conditions (the "Terms of Use").

The materials in this site are provided "as is" and without warranties of any kind, either express or implied.

We reserve the right to update the Privacy Policy and Terms of Use with or without notice.

### Copyright

The logos, images, scripts, and individual pages are copyrighted material. The materials on this site cannot be copied / modified without permission.