When it comes to converting cm to inches, grams to pounds, liters to gallons, or Fahrenheit to Celcius, Google can be your friend. Instead of firing up a conversion site, or even turning to your favorite conversion app on your phone, you can input your conversion into Google (e.g. "15cm in inches") and let Mountain View do the work. Alternatively, you can Google 'unit conversion' and Google's own converter will be the top result. Google covers everthing from length, mass, speed, volume, and area, to fuel consumption, time and digital storage.