Estimate a child's adult height from parents' heights with the mid-parental method. Get a ±8 cm range in seconds — free, local, estimate only.
Compute children's BMI from height and weight with metric/imperial inputs and a healthy-range readout for growth tracking. See where a 10-year-old sits — free, local, informational only.
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Estimate lean body mass from weight and height with Boer and James formulas averaged — the number training actually moves. Track muscle, not just scale weight — free, local, informational only.
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Mid-parental method: average both parents' heights, then +6.5 cm for boys, −6.5 cm for girls. Two 170 cm parents predict ~176.5 cm for a son — inside a ±8 cm band.
Most children land within about ±8 cm of the mid-parental target — genetics plus nutrition and health move individuals around the line. Treat it as a planning estimate, not a medical forecast. Example: father 170 cm, mother 160 cm predicts ~172 cm (67.5 in) for a son, range 164–180 cm.
The method needs no child measurements, so any age works — but predictions firm up as growth history accumulates. Revisit yearly with actual measurements.
No — math runs locally in your browser. Nothing leaves your device.
Baby Growth Percentile Calculator
Compare baby weight and height against WHO median references by age and sex, shown as % above or below the median — a reference comparison, not clinical percentiles. Monitor your childs growth compared to population medians. Health data never leaves your device — every calculation runs locally in your browser.
BMI Calculator for Kids
Compute children's BMI from height and weight with metric/imperial inputs and a healthy-range readout for growth tracking. See where a 10-year-old sits — free, local, informational only.
Last updated October 2026