import { Gender } from '../enums/gender';
/**
 * Calculate body fat percentage using the US Navy method (metric)
 *
 * @param gender Gender of the person
 * @param height Height in centimeters
 * @param neck Neck circumference in centimeters
 * @param waist Waist circumference in centimeters
 * @param hip Hip circumference in centimeters (required for women)
 * @returns Body fat percentage
 */
export declare function calculateBodyFat(gender: Gender, height: number, neck: number, waist: number, hip?: number): number;