Stone is a unit converter to help during travel. While traveling do you ever wonder how fast km/h is in mph? How many ounces is in a liter? Stone helps you quickly convert units while traveling. With a simple feature set and intuitive design, using Stone is simple.

Stone converts currencies from all over the world, distances, mass, volume and speed. Quickly find the conversion with just a glance at our unit tables and view in-between values with a click.

Stone is free to download and has a few unlocked units so you can try the app out. When you are ready, download the paid version to unlock everything.