Depends on how fast you are walking and at what incline. Uphill will burn more than a flat plain. But a rough estimate would be about 600-800 for walking.
If you are walking a 15 Minute mile, and you weigh 125 pounds, you will burn 264 calories in an hour. If you weigh 150 pounds, you will burn 312 calories. If you weigh 175, you will burn 366; and if...