This page allows you to convert length values expressed in inches to their equivalent in decameters.
Enter the value in inches in the top field (the one marked "in"), then press the "Convert" button or the "Enter" key. The converter also works the other way round: if you enter the value in decameters in the "dam" field, the equivalent value in inches is calculated and displayed in the top field.
The international inch, equivalent to 25.40 mm.
The decameter is a unit of length of the metric system equivalent to 10 m. It's not commonly used.