What is 531 degrees Celsius in Fahrenheit? 531 c equals 987.8 f 987.8 Fahrenheit  The C to F formula is (C * 9/5) + 32 = F 531 x 9 = 4779 531 / 5 = 955.8 955.8 + 32 = 987.8 531 degrees Celsius equals 987.8 degrees Fahrenheit. 531ctof 531c to f C