miijs/miiMeasureConversion.js

The most complete and easy to use Mii library available.

function miiHeightToMeasurements(value) {
    // h in [0, 127]
    const totalInches = 36 + (48 / 127) * value; // 3' to 7'
    return {
        feet: Math.floor(totalInches / 12),
        inches: Math.round(totalInches % 12),
        totalInches,

        centimeters: Math.round(totalInches * 2.54)
    };
}
function inchesToMiiHeight(totalInches) {
    return ((totalInches - 36) * 127) / 48;
}
function centimetersToMiiHeight(totalCentimeters) {
    return ((Math.round(totalCentimeters / 2.54) - 36) * 127) / 48;
}

// ---- Tunable anchors (BMI breakpoints) ----
const BMI_MIN = 16;
const BMI_MID = 22;
const BMI_MAX = 35;
function bmiFromWeightSlider(w) {
    // w in [0, 127]
    if (w <= 64) {
        return BMI_MID - (64 - w) * (BMI_MID - BMI_MIN) / 64;
    } else {
        return BMI_MID + (w - 64) * (BMI_MAX - BMI_MID) / 63;
    }
}
function miiWeightToMeasurements(heightInches, miiWeight) {
    /*
    Take the height, map it to a reasonable height 0-127 === 3'-7'.
    Get the average weight for that height.
    Take the slider 0-127 for weight, assume 64 is the average midpoint.
    If less than 64, make the Mii's weight more underweight than the average.
    If higher, make the Mii's weight more overweight than the average.
    The shorter the height, the less drastic the weight changes.

    This is approximate, not guaranteed accurate nor intended to be taken that way. This is for entertainment value only.
    */
    const H = miiHeightToMeasurements(heightInches).totalInches;
    const BMI = bmiFromWeightSlider(miiWeight);
    return {
        pounds: BMI * (H * H) / 703,
        kilograms: Math.round((BMI * (H * H) / 703) * 0.4535924)
    };
}
function imperialHeightWeightToMiiWeight(heightInches, weightLbs) {
    const H = miiHeightToMeasurements(heightInches).totalInches;
    const BMI = weightLbs * 703 / (H * H);

    if (BMI <= BMI_MID) {
        return 64 - 64 * (BMI_MID - BMI) / (BMI_MID - BMI_MIN);
    }
    else {
        return 64 + 63 * (BMI - BMI_MID) / (BMI_MAX - BMI_MID);
    }
}
function metricHeightWeightToMiiWeight(heightCentimeters, weightKilograms) {
    const heightInches = Math.round(heightCentimeters / 2.54);
    const weightLbs = Math.round(weightKilograms / 0.4535924);
    const H = miiHeightToMeasurements(heightInches).totalInches;
    const BMI = weightLbs * 703 / (H * H);

    if (BMI <= BMI_MID) {
        return 64 - 64 * (BMI_MID - BMI) / (BMI_MID - BMI_MIN);
    }
    else {
        return 64 + 63 * (BMI - BMI_MID) / (BMI_MAX - BMI_MID);
    }
}
export {
    miiHeightToMeasurements,
    inchesToMiiHeight,
    centimetersToMiiHeight,

    miiWeightToMeasurements,
    imperialHeightWeightToMiiWeight,
    metricHeightWeightToMiiWeight
};