This page allows you to convert length values expressed in nanometers to their equivalent in femtometers.
Enter the value in nanometers in the top field (the one marked "nm"), then press the "Convert" button or the "Enter" key. The converter also works the other way round: if you enter the value in femtometers in the "fm" field, the equivalent value in nanometers is calculated and displayed in the top field.
Metric system. One billionth of a meter
Metric system. One quadrillionth of a meter