A free app for Android, by Appovo.

WeightFit: Weight Loss Tracker is the most reliable app you can use when it comes to your fitness journey, especially when you want to lose some weight, keep track of your progress and be the best version of yourself. This app will assist you and help you reach your certain fitness goal by defining your own target weight.

It has a BMI calculator that can calculate your BMI and ideal weight. The app is also able to analyze your weight history to gain insights (from your Google Fit account!) along the way which is beneficial in the long run. You will never forget to track your progress every day since the app will remind you every time.