HEALTH
BMI calculator
Estimate body mass index from weight and height, with adult screening bands, equivalent imperial values and clear limitations.
Neutral presentation is active.
No regional currency, unit or language profile is applied. This choice does not convert values or change formulas, results, routes or legal guidance.
Estimated BMI
22.86Within the usual adult screening range- Usual adult range at this height
- 56.66–76.26 kg
- Weight equivalent
- 154.32 lb
- Height equivalent
- 68.9 in
- BMI prime
- 0.914
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Verification and calculation details
- Purpose
- BMI calculator
- Variables and units
- Use the labelled fields and units shown in the calculator. Results use those units unless a conversion is stated.
- Formula and method
- The exact formula and worked example are shown below. Deterministic formula executed locally in the browser.
- Assumptions
- Only entered values and stated assumptions are included. Local fees, rules and professional requirements are excluded unless explicitly shown.
- Engine version
- 1.0.0
- Production verification baseline
- Release 63 · source
998803f - Verification run
release-v63-2026-09-20- Last verified
- — Automated release checks passing
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How this calculator works
BMI = weight in kilograms ÷ height in metres squared. Adult screening ranges are general population bands and are not a diagnosis or medical advice.
Variables and inputs
- Weight
- Required numeric input. finite numeric value; calculator-specific validation applies.
- Height
- Optional numeric input. finite numeric value; calculator-specific validation applies.
How to interpret the result
The calculator returns body mass index, adult screening category, usual adult screening range, metric-to-imperial weight equivalent, metric-to-imperial height equivalent. Read each output against the assumptions you entered, compare alternatives one variable at a time, and use the result as an estimate rather than a promise.
Common mistakes to avoid
- Mixing units or entering a rate as a decimal when the field requests a percentage.
- Rounding intermediate values instead of the final displayed result.
- Leaving out a cost, timing rule or local requirement listed in the assumptions below.
Practical uses
Use the bmi calculator to check a real scenario, compare a changed assumption and explain the arithmetic before relying on a quote, specification or decision.
Worked example
For a weight of 70 kg and height of 175 cm, BMI is 70 ÷ 1.75², or approximately 22.86, which sits in the usual adult screening range.
Assumptions and limitations
- the formula is the adult BMI screening calculation of kilograms divided by metres squared
- screening categories are population references and do not diagnose body composition, fitness or health
- results are estimates; confirm rates, prices, units and professional requirements that apply
Important notes
Results are estimates based on the values entered. Confirm rates, prices, units and professional requirements that apply in your location. Review the Answer Atlas Calculation Standard and corrections policy for formula, privacy and correction rules.
Frequently asked questions
Is BMI a medical diagnosis?
No. BMI is a general screening measure and does not directly measure body fat, fitness or overall health.
Who should interpret a BMI result?
A qualified healthcare professional can consider BMI alongside age, medical history, body composition, pregnancy, athletic build and other relevant factors.
Does BMI apply to everyone?
BMI bands are adult population screening bands. They may be less useful for children, older adults, athletes, pregnant people and people with medical conditions.