The soil organic carbon is very important because it is the largest store or reservoir of carbon in terrestrial ecosystems. Maintaining and increasing soil carbon is an option to reduce the amounts of CO2 into the atmosphere and thereby reduce or mitigate climate change.

In recent years, in all nations are working very intensively on the development of soil organic carbon inventories. The study of soil organic carbon is now a topic of great interest so it is recommended to know the amount of soil organic carbon along the profile to select and evaluate those areas that should be preserved.

On the other hand, in scientific meetings we have observed errors in the calculation of soil organic carbon and, in the same way, professional no soil scientists have complications for the calculation of soil organic carbon. For both reasons, Mexican engineers (company Skiu -Scientific Knowledge In Use, (http://www.actswithscience.com/apps/) have created a Smartphone App for calculate quickly and easily soil organic carbon in horizon and profile.

The App is in "Play Store" is easy to use because the common units of measurement of soil properties, as employed: bulk density in mg mL-1; horizon thickness in cm; coarse fragments or stony percentage and organic carbon percentage.

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