Exact factors: 1 in = 2.54 cm; 1 ft = 12 in; 1 m = 100 cm.
From ft/in → cm: cm = (ft × 12 + in) × 2.54.
From cm → ft/in: total_in = cm / 2.54, then ft = ⌊total_in / 12⌋, in = total_in − ft × 12.
Decimals allowed: you can enter fractional inches (e.g., 2.5 in) and centimeters (e.g., 172.7 cm).
Normalization: if you enter ≥12 inches, they’re rolled into feet automatically.
Rounding: output precision is selectable (0–4 decimals).
Edge cases & notes
If both cm and ft/in are provided, cm takes priority.
Negative values are rejected; leave unused fields blank.
Thousands separators are for readability; raw numeric values follow the chosen precision.
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