You have probably used an online map service (like Mapquest or Google Maps) to get directions and an approximate travel distance between towns.
But you can also calculate the exact distance of, say, your three-hour Sunday afternoon walk -- including all the twists and turns of your unique rote.
The free service uses Google Maps and adds a calorie burning tool. To indicate your route, you simply plot the exact course by clicking markers on the map. It works in miles and kilometers and you can save the map as a unique URL or in the GPX format.