Our Story
We’re here to help doctors be the best patient care providers they can be. That’s how we started, and that’s how we’ll evolve.

When Dr. Graham Walker and Dr. Joe Habboushe created MDCalc in 2005, its purpose was to support a clinician’s workflow and to drive confidence in clinical decision-making.

With the help of some of the most incredible clinicians, researchers, and medical societies, MDCalc has experienced rapid organic growth to become the most broadly used medical reference for clinical decision tools and content, trusted by millions of healthcare professionals globally.

Now, we’ve expanded MDCalc with a thoughtful and seamless EHR integration that brings our mission and countless benefits to entire health systems. We can’t wait to find out what tomorrow may hold.
Our mission is inspired by yours
We’re here to improve patient care by providing instant access to evidence-based tools that support clinical decision-making
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We’re here for the journey
2005
2005
2009
2011
2012
2005
2015
2016
2005
2017
2018
2019
2005
2020
2005
2021
2021
2005
2005

The launch of MDCalc! The first version of our website goes live in November, featuring the original logo and web design.

2009
2009

We unveil our first major logo and branding update.

2011
2011

We received incredible response and engagement from a rapidly growing userbase. We implemented several upgrades to include highly requested features, including content tabs with expert clinical insights.

2012
2012

We released our 100th calc, CIWA-Ar for Alcohol Withdrawal. By the end of the year, we ran more than 1 million scores since its inception.

2015
2015

In January, we formalized our Scientific Advisory Board with leading experts across medicine. In March, we reached one million unique clinician users.

2016
2016

We released our first iOS app in March.

2017
2017

In April, we released our Android app. In October, the team launched our first Medical Society Partnership Guidelines Summary with ACG.

2018
2018

By August, 80% of residents and 65% of attending physicians in the US trust MDCalc as their leading CDS tool and utilize it on a weekly basis.

2019
2019

We reached a new milestone of over 100 million scores calculated per year and released our 500th calc, HScore for Reactive Hemophagocytic Syndrome.

2020
2020

Our CME feature went live. Clinicians can receive credit for their use of MDCalc. MDCalc is officially the most broadly used medical reference tool by the end of the year, with a userbase of more than 3 million unique clinicians.

2021
2021

We officially launched our new EHR integration, MDCalc for EHR.

Two emergency medicine docs with a vision
Joe Habboushe, MD, MBA
Joe Habboushe, MD, MBA
Joe Habboushe, MD, MBA is the CEO and co-founder of MDCalc. He is also the creator and editor-in-chief of the EMRAS pocket guide series entitled Basics of Emergency Medicine. A seventh-generation physician, Joe earned his MBA in healthcare finance from Columbia University and a BS in mathematics from Yale. Today, he is a practicing emergency physician in New York City and an associate professor at Weill Cornell Medicine.
Graham Walker, MD
Graham Walker, MD
Graham Walker, MD, is a co-founder of MDCalc. He is also a practicing emergency physician in San Francisco. He was inspired to start MDCalc at the Stanford University School of Medicine where he attended medical school. Graham then traveled to New York City and served as chief resident at St. Luke’s Roosevelt Hospital Center, where he met Joe and created the most broadly used medical reference for clinical decision tools and content.
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