Glucose Conversion tools in Java

GlucoseConverter.java

import java.math.BigDecimal;
import java.math.RoundingMode;

public class GlucoseConverter {
public class GlucoseConverter {
    public int glucoseToMgDl(double mmolL){
        // Mg/dL = mmol/L * 18
        double converted = mmolL * 18;
        return (int) converted;
    }

    public double glucoseToMmolL(double mgDl){
        return round(mgDl / 18.0, 1);
    }

    public static double round(double value, int places) {
        if (places < 0) throw new IllegalArgumentException();

        BigDecimal bd = new BigDecimal(value);
        bd = bd.setScale(places, RoundingMode.HALF_UP);
        return bd.doubleValue();
    }

    public double glucoseToA1C(int mgDl){
        // A1C = (Average glucose + 46.7) / 28.7
        return (mgDl+46.7)/28.7;
    }
}