Height Calculator
Convert any height between centimeters and US feet-and-inches in both directions with a quick reference table, then estimate a child’s future adult height from the mother’s and father’s heights using the mid-parental method.
TheCalculators — Height Calculator
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Height Conversion
5′ 8.9″
175 cm = 5 ft 8.9 in = 68.9 total inches
Everyday height units
- Centimeters
- 175 cm
- Feet & Inches
- 5′ 8.9″
- Total Inches
- 68.9
- Meters
- 1.75 m
- Millimeters
- 1,750 mm
- 1 in = 2.54 cm (exact)
- International definition
Common heights — cm to feet & inches
👶 Predicted adult height (mid-parental method)
- Predicted Height
- 177.4 cm (5′ 9.8″)
- Likely Range
- 168.9–185.9 cm (5′ 6.5″ – 6′ 1.2″)
- Parent Midpoint
- 171 cm
- Adjustment
- +6.4 cm for boys
Genetics explains roughly 60–80% of height. The ±8.5 cm range covers most outcomes; nutrition, sleep and health shift the result within (and occasionally beyond) it. Predictions are for unborn children or kids too young to project from growth data.
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Formula
cm = (ft × 12 + in) × 2.54 · Boy: (mom + dad)/2 + 6.4 cm · Girl: (mom + dad)/2 − 6.4 cm · ± 8.5 cm
- • Metric → US: divide cm by 2.54 for total inches; feet = ⌊inches ÷ 12⌋, remainder is inches.
- • US → metric: multiply total inches by exactly 2.54.
- • Mid-parental prediction averages the parents’ heights, adds 6.4 cm for boys or subtracts 6.4 cm for girls, with a ±8.5 cm healthy range.
Pro tips
- • Measure height in the morning — spines compress up to 1–2 cm during the day.
- • 5 ft 9 in is exactly 175.26 cm; quick mental math: inches × 2.5 then add 2%.
- • The mid-parental estimate is most reliable before puberty; growth-chart percentiles predict better afterwards.
FAQ
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