Convert serial.read() to usable int

Using Arduino Programming Questions
7

AWOL:
Have you thought about using "atoi"?
(Hint: You're not the first person to ask this question, just the first this week)

I tried before, but no luck....
Arduino says:
error: invalid conversion from 'char' to 'const char*'
error: initializing argument 1 of 'int atoi(const char*)'

char recievedChar;
int value;
void setup()
{
 Serial.begin(115200);
 Serial2.begin(115200);
}
void loop()
{
 if (Serial2.available()){
 recievedChar = Serial2.read();
 value = atoi(recievedChar);
 Serial.print(value);
 }
}