US Unit Converter is a free iPhone app developed by Kei Suefuji. It falls under the Utilities & Tools category and provides a convenient way to convert units of length, weight, area, liquid volume, and temperature used in the United States to the International System of Units.

With US Unit Converter, you can simply select the category of the unit you want to convert at the top of the screen, enter the value, and get an immediate conversion. The app supports a wide range of units for conversion.

For length, you can convert between meters, centimeters, millimeters, kilometers, inches, feet, yards, and miles. Weight units include kilogram, gram, pound, and ounce. Area units supported are square meters, Are, hectares, square kilometers, square feet, square inches, square miles, acres, and square yards. Liquid volume units include liter, milliliter, fluid ounce, cup, pint, quart, and gallon. Temperature units supported are Celsius and Fahrenheit.

In the free version of US Unit Converter, you can view your previous conversion history. However, if you want to access 100 historical data or remove ads, you have the option to purchase the premium version within the app.