Main Page | See live article | Alphabetical index Cardiac output is the volume of blood being pumped by the heart in a minute. It is equal to the heart rate multiplied by the stroke volume. So if there are 70 beats per minute, and 70 mL blood with each beat of the heart, the cardiac output is 490 mL/minute. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.