How this calculator works
“Ideal weight” formulas often return a deceptively precise number. Human bodies are not precise in that way. This tool uses a broad BMI reference interval because a range is more honest than a single target.
The interval still cannot account for muscle mass, body proportions, age-related changes, ethnicity-specific risk or medical history. It should start a conversation, not finish one.
Weight = BMI × height². The lower and upper values use adult BMI reference points 18.5 and 24.9; BMI 22 is shown only as a midpoint.
How to use the result
If you want to change weight, a nearer milestone—often 5% of current weight—can be more actionable than jumping to the middle of a broad range. The right endpoint is one that supports health and can be maintained.
For someone with a history of disordered eating, focusing on behaviours, strength, symptoms and clinical markers may be safer than using a scale target.
Get a more reliable result
Enter a carefully measured adult height and treat the output as a broad reference interval. The calculator converts the conventional BMI range into weights for that height; it cannot account for frame size, muscle mass, fat distribution, ethnicity, symptoms, medical history or the weight at which habits are most sustainable.
Common errors that change the answer
- Reading the midpoint as a biologically perfect or cosmetically required weight.
- Ignoring strength, waist trend, laboratory results, energy levels and menstrual health.
- Setting a large final target before testing a safer and more achievable first 5% change.
What to do next
- Choose a first milestone rather than one final “perfect” number.
- Track energy, strength, waist and health markers alongside weight.
- Use clinical advice when medication or a condition affects weight.
Guides that support this calculator
Frequently asked questions
Why not give one ideal weight?
Because there is no scientifically defensible single weight for every person of one height. Composition, history and sustainability matter.
Must I be inside this range to be healthy?
No. It is a population screening interval, not a complete definition of individual health.
How quickly should weight change?
That depends on starting point, health and the direction of change. Faster is not automatically better; seek personalised guidance when needed.