Thias gist contain all the conversion formulas for the temperature.

temperatureConversionFormulas.dart

// c represents the Celsius value which you will add according to mode of conversion you want.
// r represents the Rankine value which you will add according to mode of conversion you want
// k represents the Kelvin value which you will add according to mode of conversion you want.
// f represents the Fahrenheit value which you will add according to mode of conversion you want


class Temperature {
  double celsiusToFahrenheit(num c) {
    return (c * 9 / 5 + 32);
  }

  double celsiusToRankine(num c) {
    return (c + 273.15) * 9 / 5;
  }

  double celsiusToKelvin(num c) {
    return (c + 273.15);
  }

  double fahrenheitToCelsius(num f) {
    return (f - 32) * 5 / 9;
  }

  double fahrenheitToKelvin(num f) {
    return (f + 459.67) * 5 / 9;
  }

  double fahrenheitToRankine(num f) {
    return (f + 459.67);
  }

  double kelvinToFahrenheit(num k) {
    return (k * 9 / 5 - 459.67);
  }

  double kelvinToCelsius(num k) {
    return (k - 273.15);
  }

  double kelvinToRankine(num k) {
    return (k * 9 / 5);
  }

  double rankineToCelsius(num r) {
    return (r - 491.67) * 5 / 9;
  }

  double rankineToFahrenheit(num r) {
    return (r - 459.67);
  }

  double rankineToKelvin(num r) {
    return (r * 5 / 9);
  }
}