Speed Distance Time Calculator is an iPhone application developed by Daniel Connell, which is available for a full version license under the Education & Reference category. This app helps to calculate either speed, distance or time by simply entering the other two measurements. The app is easy to use, and the user needs to tap the name of the measurement they want to calculate (Speed, Distance, or Time) and then enter their values by tapping the empty fields.

The app is equipped with various speed and distance units such as mph, km/h, min/mile, min/km, min/m, m/s, cm/s, m/min, feet/m, feet/s, inch/min, inch/s, furlongs/minute, leagues per day, knots, mach, % speed of light, Mm/s, miles, km, meters, cm, mm, feet, inches, yards, furlongs, nautical miles, leagues, light years (ly), parsecs (pc), and megameters (Mm). The app also has a stopwatch feature that helps to record time values directly into the app with high accuracy.