Caution: Continued use of GPS running in the background can dramatically decrease battery life. Don't forget to 'Stop' after walking.

Using Calorie Walk, You can record walking, then you can see how much calorie is burned.
Next, You can record eating food so that you can calculate how much calorie you gain.
You can see the all results from calendar after then.

Caution: This app support to calculate using 'equation for walking', So If the velocity is over 12km/hour, calorie burn is set '0'. Calorie is burned even when you do nothing :), so, don't try walk for a long time to exceed gained calorie. :)