Calculating bmr caloriecalculator using imperial units

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C#

can someone help me to get the right answer when radio button metric is checked i get the write bmr from height (cm )and weight (kg) but when imperial US button is checked i am not able to get the right answer, For the Imperial option , given in feet (ft) and inches (in) and weight is in pounds (lb).

note : BMR = 10 * weight (kg) + 6.25 * height (cm) - 5 * age (y I tried this code but did not work for me

any help would be appreciated Thanks in advance
i know my code is a mess but i am just a beginner

What I have tried:

private bool InputBMR()
    {
        {
            if (BmrCalc.GetUnit() == UnitTypes.Us)
                if
                (int.TryParse(txtAge.Text, out var age) &&
            double.TryParse(txtHeightInch.Text, out var height) &&
            double.TryParse(txtWeight.Text, out var weight))
                {
                    double num1, num2, result;
                    num1 = Convert.ToDouble(txtheightIFeet.Text);
                    num2 = Convert.ToDouble(txtHeightInch.Text);
                    result = (num2 + (num1 * 12));
                    BmrCalc.Age = age;
                    BmrCalc.Height = result;
                    BmrCalc.Weight = weight;
                    return true;
                }
        else
                {
                    MessageBox.Show("Error: Invalid input in bmr calculator. ", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return false;
                }
        }
        if(rdoMetric.Checked)
            if(int.TryParse(txtAge.Text, out var age) &&
            double.TryParse(txtHeightInch.Text, out var height) &&
            double.TryParse(txtWeight.Text, out var weight))
            {
                BmrCalc.Age = age;
                BmrCalc.Height = height;
                BmrCalc.Weight = weight;
                return true;
            }
            else
            {
                MessageBox.Show("Error: Invalid input in Bmi calculator. Height must be numbers ", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return false;
            }
        return true;
    }