QuickUnits is a unit converter for iPhone and iPod Touch. It was built from the ground up to be simple and fast...really fast.
No setup or configuration — just select the unit category, then the measurement you know and after every number you enter it will instantly update all of the units in the category.
** QuickUnits converts all of the following measurement types. **
Mass: Kilograms, Grams, Milligrams, Stones, Pounds, Ounces
Volume: Liters, Milliliters, Cubic Feet, Gallons (US), Quarts (US), Pints (US), Cups (US), Fluid Ounces (US), Tablespoons (US), Teaspoons (US)
Length: Kilometers, Meters, Centimeters, Millimeters, Miles, Yards, Feet, Inches
Area: Square Kilometers, Hectares, Square Meters, Square Miles, Acres, Square Yards, Square Feet, Square Inches
Speed: Kilometers / Hour, Meters / Second, Miles / Hour, Feet / Second, Knots
Temperature: Celsius, Fahrenheit, Kelvin