Free calculator
Healthy Weight Range Calculator
See the standard BMI-based reference range for your height.
Before you use the calculator
What is this calculator for?
A healthy weight range calculator estimates a broad weight range based mainly on your height and recognised BMI thresholds. It can be useful as a reference point, but there is no single 'perfect' weight that applies to everyone. Body composition, ethnicity, age, muscle mass, medical conditions and how you actually feel all matter.
What it measures
- Height
- BMI-based reference range
- Estimated weight range
Why it is here
It gives you a broad frame of reference when setting goals or deciding whether further assessment might be worthwhile.
What this result cannot tell you
No calculator can understand everything about you. Important limitations include:
- Muscle mass
- Body fat distribution
- Ethnicity
- Age-related changes
- Medical conditions
- Pregnancy
- Your personal history and what is realistic for you
A healthy target should improve your life, not become another number to obsess over. Sometimes feeling better at a weight you can maintain is far more useful than chasing the bottom of a chart.
How to use the result sensibly
Use the number as a starting point. Look at the overall trend, how you feel, what is happening with your waist, movement, sleep, blood pressure and other relevant health markers. Where the result is unexpected, concerning or difficult to interpret, a qualified healthcare professional can put it into context.
Industry-standard does not mean individually perfect. These calculators use recognised methods because they are useful, not because they can define a person. Results are informational, subjective in context and open to interpretation.
What should I do next?
How this works, limitations & evidence
Interpretation, limitations & evidence
Understand the result — then decide what matters
This calculator reverses the BMI formula to show the body weights that correspond to the standard adult BMI range of 18.5–24.9 at your height.
How the range is calculated
Lower weight = 18.5 × height². Upper weight = 24.9 × height², using height in metres.
A reference range is not automatically your goal
If somebody starts at a much higher weight, achieving a clinically meaningful 5%, 10% or 15% reduction can improve health even if BMI remains above 25. Your first useful target does not have to be the bottom of a chart.
Why the range can feel surprisingly low
BMI ranges are population references. They do not know your frame, muscle mass, history or what amount of loss is realistic and maintainable.
Ethnicity changes risk thresholds
NHS and NICE use lower overweight and obesity thresholds for several ethnic backgrounds because cardiometabolic risk can occur at lower BMI. That does not make a generic chart a perfect personal target.
Use waist and health markers too
Waist-to-height ratio, blood pressure, glucose, lipids, sleep and mobility can show health change that the weight range cannot.
Set staged goals
Think in stages: first 5%, then review; another 5% if appropriate; then decide whether further loss improves health and is sustainable. A clinician or dietitian can help if treatment decisions depend on weight targets.
Common questions
Do I need to reach this range to be healthy?
No. Health can improve substantially before reaching the standard BMI range.
Is the top of the range my ideal weight?
Not necessarily; it is a reference threshold, not an individual prescription.
What if I have lots of muscle?
BMI-based ranges can underestimate an appropriate body weight for very muscular people.
What should I use next?
Sources & methodology
We use UK guidance and primary research where appropriate, and disclose when a result is an estimate rather than a clinical threshold.
Use this page as information, not judgement. The best next step is the one that actually fits your health, your life and what you are ready to change.
Written and editorially reviewed by the Shift Some Timber. Editorial review is not clinical review. Health content is checked against recognised UK guidance and primary sources where appropriate.
Last reviewed: 8 August 2026. This page is informational and does not replace individual medical advice.