AC voltage measuring using arduino

Using Arduino Project Guidance
8

Thanks for the support and sorry for forgetting to give the details
I am using a 3-0-3 ,500 ma transformer with full wave rectifier. What I need is to measure the AC line voltage( Accuracy not so). Input is 230v/50Hz domestic line voltage.After the rectification I am using a10uF capacitor for filtering .
About 230/1023.
I think its a mistake. Since ADC is 10 bit , output voltage will be (analogout*(5/1024)). I am trying to change this.
I tried with a load resistance 10K, but readings drops to 160v

void setup()
{
  Serial.begin(9600);
}
void loop()
{
  int x,volt,y;
  x=analogRead(4);
  volt=x*(230/1023);
  Serial.println(x);
  
  delay(500);
   Serial.println(volt);
     delay(500);
}