Here's how to convert inches to nanometers:

* 1 inch = 25.4 millimeters

* 1 millimeter = 1,000,000 nanometers

Therefore:

* 1 inch = 25.4 mm * 1,000,000 nm/mm = 25,400,000 nanometers

So, there are 25,400,000 nanometers in one inch.