Give 0.3in%

A direct conversion from a unit of length (inches) to a percentage is not possible without additional context. A percentage represents a fraction of a whole, so to express 0.3 inches as a percentage, you would need to specify what whole quantity it is a percentage of.

For example:

• If you meant "0.3 inches as a percentage of 1 inch", it would be $\frac{0.3\ \text{in}}{1\ \text{in}} \times 100\% = 30\%$.
• If you meant "0.3 inches as a percentage of 1 foot (12 inches)", it would be $\frac{0.3\ \text{in}}{12\ \text{in}} \times 100\% = 2.5\%$.

Please clarify what you would like 0.3 inches to be a percentage of.