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

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Other Contact Information

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

Email for general enquiries: enquiries [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, statistics and financial 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 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: and

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. is not intended to provide any legal, investment, financial, or tax advice. Good Calculators is not a financial planner, broker, or tax advisor.

This site is intended only to assist in educating users on various topics in mathematics, statistics, science and engineering, computing, economics and finance.

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


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