MDCalc is a free online medical reference for healthcare professionals that provides point-of-care clinical decision-support tools, including medical calculators, scoring systems, and algorithms.

[1] MDCalc is also a mobile and web app.

[2] The decision-support tools are based on published clinical research,[3] and MDCalc’s content is written by physician authors.

[4] MDCalc was founded by two emergency physicians, Graham Walker, MD, and Joseph Habboushe, MD, MBA,[5] and provides over 500 medical calculators and other clinical decision-support tools.

[8] A 2017 survey estimated 65% of U.S. attending physicians and 79% of U.S. resident physicians use MDCalc regularly.