Yes, you can lose weight by walking! This table shows how many calories you burn (based on your weight) at a 3.0mph walking pace. Get a pedometer and try to shoot for 10,000 steps a day, roughly 5 miles. See how many calories you burn!
200 lb person 60 Minute Walk X 5 days a week Walking at a fast pace (3.5mph) for 60 minutes= 410 calories burned per walk Great website to figure out how many calories you're really losing when you exercise!
All About Burning Calories Infographic- I have to say, I do NOT pay attention to calories because I think people drive themselves crazy with it and sabotage the best of intentions. However, this does have some useful info on it. :-)