Are you skinny if you weigh 75 pounds but your 4 ft 3?

Yes, if you weigh 75 pounds and are 4 feet 3 inches tall, you would be considered underweight according to most body mass index (BMI) calculations. Your BMI would be significantly below the healthy range, indicating that you may be at risk for health issues related to low body weight. It's important to consult a healthcare professional for a thorough assessment and guidance.