Ideal body weight Miller calculator

Missing fields and non-numeric height values are rejected with invalid_input so blank forms never invent a weight.

What Miller ideal body weight means

Unlike multi-formula aggregators that return Robinson, Devine, and Miller side by side, this capability commits to Miller only so search intent for a Miller calculator maps to one formula name, one set of coefficients, and one reproducible JSON shape.

How to call the API and what comes back

After conversion, height must stay between one hundred and three hundred centimetres so adult Miller estimates remain in a supported anthropometric window. Send a JSON body with two required fields: height as a finite positive number (aliases height_cm, h, stature, cm, ht) and sex as male or female (aliases gender, sex_at_birth; short forms m, f, man, woman are accepted after case folding). Optional height_unit defaults to cm and also accepts m or in so metric forms and inch-based charts share one conversion pipeline. On success the response echoes rounded height and height_unit as submitted, height_cm and height_in after conversion, inches_over_5ft as the excess above sixty inches, sex as normalized male or female, base_kg and slope_kg_per_in for the chosen sex, ibw_kg as the primary result, ibw_lb as a pound conversion for mixed-unit teaching, unit as the string kg, formula as the Miller expression for that sex, formula_name as Miller, message as a short English summary, and steps as an ordered array of substitution lines. Failed validation—missing height or sex, non-finite or non-numeric height, unsupported unit labels, non-positive height, or values outside absolute limits after conversion—returns invalid_input and is never charged. Pricing is a flat $0.002 per successful request with unit item.

Practical tips, limits, and related searches

Prefer sending numbers rather than pre-formatted strings when you control the client; string numbers are accepted only when they match a strict finite numeric pattern. Prefer this capability when you already know height and sex and only need the Miller estimate; if your source is a multi-formula comparison problem, use a multi-formula product surface instead. Keep stature inside the published centimetre window after conversion so intermediate inches and the linear product remain finite on the Worker and in the browser. When teaching, pair examples: one hundred seventy-five centimetres male yields a Miller kilogram result slightly above the five-foot male base; one hundred sixty-five centimetres female uses the female base and slope; deliberate omission of sex or a non-numeric height string demonstrates the hard invalid_input path; and a five-foot-ten adult entered as seventy inches with height_unit in shows unit conversion into the same centimetre-inch pipeline. This landing targets people searching for an ideal body weight Miller calculator, Miller formula IBW, or ideal body weight from height and sex online; it is not a Devine or Robinson calculator, not a BMI tool, and not a clinical dosing system that applies mg per kilogram of IBW to a drug. Failed tasks that return invalid_input do not consume prepaid balance, which keeps exploratory scripts cheap when learners deliberately leave sex blank. Round-trip checks are easy: convert height to inches by dividing centimetres by two point five four, subtract sixty, multiply by one point four one for men or one point three six for women, add the sex base, and confirm it equals the published ibw_kg within the same twelve-decimal rounding, and confirm that removing only sex flips the response from success to invalid_input.