US life expectancy: 73.5 years (male), 79.3 years (female). Lifestyle dramatically affects your timeline.
Non-smokers live 10 years longer on average. Regular exercisers add 2–4 years.
This tool is most useful for tracking trends rather than obsessing over a single data point. Run the calculation monthly with consistent measurement conditions to see whether your metric is moving in the right direction.
Many users apply adult health classifications to children and teenagers, which is incorrect. Paediatric norms for height, weight, BMI, and body composition are age-and-sex-specific. Use age-appropriate reference tools for anyone under 18.
A nurse calculates a patient's health metric during a routine assessment, then uses the result alongside other clinical indicators to contextualise the finding — correctly treating the number as one data point among several rather than a standalone answer.
Stop smoking (+10yr), exercise regularly (+2-4yr), maintain healthy BMI (+3yr), eat well (+1-3yr).
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