export type UnitSystem = 'metric' | 'imperial';
/** WHO adult BMI categories (kg/m²). Order = ascending BMI. */
export type BmiCategory = 'underweight' | 'normal' | 'overweight' | 'obese';
/** 1 lb = 0.45359237 kg (international avoirdupois pound, exact). */
export declare const KG_PER_LB = 0.45359237;
/** 1 inch = 2.54 cm (exact). */
export declare const CM_PER_IN = 2.54;
/** Inches per foot. */
export declare const IN_PER_FT = 12;
export declare const lbToKg: (lb: number) => number;
export declare const kgToLb: (kg: number) => number;
export declare const inToCm: (inches: number) => number;
export declare const cmToIn: (cm: number) => number;
/** Split a height in centimetres into whole feet + remaining inches. */
export declare function cmToFtIn(cm: number): {
    ft: number;
    in: number;
};
/** Combine feet + inches into centimetres. */
export declare const ftInToCm: (ft: number, inches: number) => number;
/**
 * Body mass index in kg/m². Returns `null` when either input is missing or
 * non-positive (height of 0 would divide by zero).
 */
export declare function computeBmi(weightKg: number | null, heightCm: number | null): number | null;
/** WHO adult cut-offs. Boundaries follow WHO: <18.5, <25, <30, ≥30. */
export declare function bmiCategory(bmi: number): BmiCategory;
/**
 * Clinically meaningful display range for the gauge arc. Values below/above
 * are clamped so the ring still reads. 12–40 spans severe-thinness through
 * obesity without wasting the dial on impossible extremes.
 */
export declare const BMI_GAUGE_MIN = 12;
export declare const BMI_GAUGE_MAX = 40;
/** Map a BMI onto a 0–100 arc-fill percent for the radialBar gauge. */
export declare function bmiToGaugePercent(bmi: number): number;
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