When to use this calculator
- Before setting a new health goal or checking whether a plan is realistic.
- When you want a quick baseline before discussing the result with a professional.
- When you are starting a fitness or diet programme and want a starting measurement.
- When you want to recheck the numbers after several weeks of change.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Height (cm) | 175 |
For those figures the calculator returns:
- Healthy weight range: 56.70kg – 76.30kg
- Midpoint: 66.50kg
How to read your results
Healthy Weight Range
A planning range based on standard BMI thresholds, not a prescriptive personal target.
Method & assumptions
Ideal weight calculators use established formulas — most commonly Hamwi, Devine, or Robinson — to produce an estimated healthy weight range based on height and sex. These formulas were originally developed for clinical applications such as medication dosing, not as personal fitness targets. They do not account for body composition, frame size, age, ethnicity, or fitness level, all of which meaningfully influence what a healthy weight looks like for any given individual. The resulting figure is best interpreted as a broad reference point rather than a goal in itself. Rather than focusing solely on reaching a specific weight, consider also tracking waist circumference and consulting a GP or registered dietitian for personalised guidance.
Common mistakes
- Using an assumption that is not supported by a current local quote, bill, statement or official source.
- Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- Mixing monthly and annual inputs without converting them consistently.
- Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.
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