Does muscle weigh more than fat? A client of mine lost 10 pounds in her first month of training, and then the scale stopped moving. Although her clothes were fitting loser and she was losing inches, my client was distraught because she wasn't losing weight on the scale. I had to explain that muscle weighs more than fat, muscle takes up less space and is smoother than fat tissue, so you can look smaller but still weigh the same.
Keep in mind, just like a pound of feathers and a pound of apples both weigh the same - a pound muscle and a pound of fat do in fact weigh the same. The difference is the density, muscle is more dense than fat so a smaller volume of muscle will weigh the same as a larger volume of fat. For example if you have a lot of lean muscle mass you may in fact weigh the same or weigh even more than a person with more body fat - only you will be a lot leaner and likely smaller.
All in all, stepping on the scale is not always the best indication of your health and/or weight loss. The scale is a good indicator and benchmark, but we need to consider the big picture when it comes to weight loss and good health.