Educational tool — not a diagnosis. VivMetric calculators estimate body and fitness metrics using CDC, WHO, and NIH reference formulas. They do not provide medical advice, diagnosis, or treatment.
Always consult a licensed healthcare provider for medical concerns. If you are in emotional distress or thinking about harming yourself, contact the 988 Suicide & Crisis Lifeline (call or text 988, US, 24/7) or see the WHO mental-health resources.
Reverse Target Weight Calculator
Most calculators tell you your current BMI. This one works backwards: you choose a goal BMI and it tells you the exact target weight for your height, how many pounds to change, and how long at a sustainable pace.
How the math works
Target weight = (goal BMI x height squared) / 703, the inverse of the standard BMI formula. Timeline assumes ~1 lb/week for fat loss and ~0.5 lb/week for lean gain (NIH/ACSM sustainable paces).
Why set a BMI-based target?
A concrete target weight converts a vague goal into a measurable plan. The WHO healthy BMI range (18.5-24.9) is a sensible reference band for most adults.
Frequently Asked Questions
How much weight can I lose per week safely?
Most healthy adults can target 1-2 lb per week (about 0.5-1% of body weight). Faster loss often sacrifices lean mass. This tool uses a conservative 1 lb/week.
Should I aim for the middle of the healthy BMI range?
The middle (~22-23) is a common goal, but your ideal depends on muscle mass, frame, and health goals. Athletes may sit at the top of the healthy range with low body fat.
This tool provides educational health metric estimations only. It is not medical advice, diagnosis, or treatment. Always consult a licensed healthcare provider for medical concerns.