Class DisplayUnitsConverter

public static class DisplayUnitsConverter
   {
       private const double MillimetersPerInch = 25.4;
       private const double InchesPerFoot = 12;
       private const double FeetPerYard = 3;
       private const double YardsPerMeter = 0.9144;
       private const double MetersPerKilometer = 1000;
       public static double ConvertMillimetersToInches(double millimeters) => millimeters / MillimetersPerInch;
       public static double ConvertMillimetersToCentimeters(double millimeters) => millimeters / 10;
       public static double ConvertMillimetersToMeters(double millimeters) => millimeters * 0.001;
       public static double ConvertMillimetersToKilometers(double millimeters) => ConvertMillimetersToMeters(millimeters) / MetersPerKilometer;
       public static double ConvertInchesToMillimeters(double inches) => inches * MillimetersPerInch;
       public static double ConvertInchesToCentimeters(double inches) => ConvertInchesToMillimeters(inches) / 10;
       public static double ConvertInchesToMeters(double inches) => ConvertInchesToMillimeters(inches) * 0.0254;
       public static double ConvertInchesToKilometers(double inches) => ConvertInchesToMeters(inches) / 100_000;
       public static double ConvertFeetToMillimeters(double feet) => (feet * InchesPerFoot * MillimetersPerInch);
       public static double ConvertFeetToCentimeters(double feet) => ConvertFeetToMillimeters(feet) / 10;
       public static double ConvertFeetToMeters(double feet) => (feet * InchesPerFoot * MillimetersPerInch) * 0.0254;
       public static double ConvertFeetToKilometers(double feet) => ConvertFeetToMeters(feet) / 1000;
       public static double ConvertYardsToMillimeters(double yards) => (yards * FeetPerYard * InchesPerFoot * MillimetersPerInch);
       public static double ConvertYardsToCentimeters(double yards) => ConvertYardsToMillimeters(yards) / 10;
       public static double ConvertYardsToMeters(double yards) => (yards * FeetPerYard * InchesPerFoot * MillimetersPerInch) * 0.0254;
       public static double ConvertYardsToKilometers(double yards) => ConvertYardsToMeters(yards) / 1000;
       public static double ConvertMetersToMillimeters(double meters) => (meters * 1000);
       public static double ConvertMetersToCentimeters(double meters) => (meters * 100);
       public static double ConvertMetersToFeet(double meters) => (meters * 3.28084);
       public static double ConvertMetersToInches(double meters) => (meters * 39.3701);
       public static double ConvertMetersToYards(double meters) => (meters * 1.09361);
       public static double ConvertMetersToKilometers(double meters) => meters;
       public static double ConvertKilometersToMillimeters(double kilometers) => (kilometers * MetersPerKilometer * 1000);
       public static double ConvertKilometersToCentimeters(double kilometers) => (kilometers * MetersPerKilometer * 100);
       public static double ConvertKilometersToMeters(double kilometers) => (kilometers * MetersPerKilometer);
       public static double ConvertKilometersToFeet(double kilometers) => (kilometers * MetersPerKilometer * 3.28084);
       public static double ConvertKilometersToInches(double kilometers) => (kilometers * MetersPerKilometer * 39.3701);
       public static double ConvertKilometersToYards(double kilometers) => (kilometers * MetersPerKilometer * 1.09361);
   }

public static float InchToPoint(float inches)
   {
      const float pointsPerInch = 72f;
      return inches * pointsPerInch;
   }

public static float MillimeterToInch(float mm)
    {
        return mm / 25.4F;
    }

public static float MillimeterToPoint(float mm)
{
}

public static float PixelToPoint(int pixels, float dpi)
{
}

public static float PointToInch(float points)
{
    const float POINTS_TO_INCH = 72.0f;
    return points / POINTS_TO_INCH;
}

public static int PointToPixel(float points, float dpi)
{
    return (int)(points * dpi);
}