PhysicsDiet.com
PhysicsDiet.com is an online weight tracking and graphing tool that applies a moving average to weight data to smooth the noise of random weight fluctuations.
The graph displays a blue moving-average trend line and green and red areas above and below the trend graph, respectively, depending on where a weight data point lies. A black, best-fit line is also shown, which is the straightest line that can be drawn through the points.
Those trying to lose weight should aim to be in the green area.