OK, here we go:

BMI is by and large an insurance-company created joke. If you have any bit of muscle at all, your BMI will show you as obese when you're perfectly fine.
The bodyfat percentage-measuring scales are a bigger joke. They don't work well. They're too dependent on hydration levels. You can get a ballpark figure of your bodyfat percentage with the same tape measure used to figure out your waist-to-hip ratio.

Here's a pretty thorough tape measure bodyfat percentage calculator. Then you can figure out your target bodyweight.

Let's say the calculator says you're at 22% bodyfat at 225. That means you've got 49.5 pounds of fat, 175.5 pounds of lean body mass.

Let's say you wanna keep all that lean body mass but drop some fat. Let's say you wanna get down to 15 percent fat. Multiply LBM by 100, then divide that number by this number: 100- your goal bodyfat percentage.

175.5*100=17550, divided by 100-15 percent =85. 17550/85= 206.5 pounds, your weight you have to hit to reach 15 percent bodyfat.

Try figuring out your bodyfat with a tape measure. They're not the most accurate measurements in the world, but they do give you an idea.