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Use the calorie calculator to estimate the number of daily calories your body needs to maintain your current weight. Select the statement that best describes your usual activity level. Inactive: Never or rarely include physical activity in your day. Somewhat active: Include light activity or moderate activity about two to three times a week. People judge the intensity of their activities differently. And activity levels can change over time. So think of your calorie estimate as a starting point and adjust it up or down as you alter your activity level.

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Mayo Clinic Healthy Living,” and the triple-shield Mayo Clinic logo are trademarks of Mayo Foundation for Medical Education and Research. On this Wikipedia the language links are at the top of the page across from the article title. The calorie is a unit of energy that originated from the obsolete caloric theory of heat. For historical reasons, two main definitions of “calorie” are in wide use.

In nutrition and food science, the term calorie and the symbol cal almost always refers to the large unit. This unit was used by U. Joseph Howard Raymond, in his classic 1894 textbook A Manual of Human Physiology. In 1879, Marcellin Berthelot distinguished between gram-calorie and kilogram-calorie, and proposed using “Calorie”, with capital “C”, for the large unit. Already in 1928 there were serious complaints about the possible confusion arising from the two main definitions of the calorie and whether the notion of using the capital letter to distinguish them was sound. The joule was the officially adopted SI unit of energy at the ninth General Conference on Weights and Measures in 1948. The alternate spelling calory is considered nonstandard and dated.

The amount of energy equal to exactly 4. The amount of energy required to warm one gram of air-free water from 3. The amount of energy required to warm one gram of air-free water from 14. Experimental values of this calorie ranged from 4. The CIPM in 1950 published a mean experimental value of 4. 1855 J, noting an uncertainty of 0. The amount of energy required to warm one gram of air-free water from 19.

The ‘Thermochemical calorie’ was defined by Rossini simply as 4. 1833 international joules in order to avoid the difficulties associated with uncertainties about the heat capacity of water. It was later redefined as 4. C calorie and the thermochemical calorie. Until 1948, the latter was defined as 4. 184 J was chosen to have the new thermochemical calorie represent the same quantity of energy as before.