Functional Temperature converter

class Temperature:
    def __init__(self, temp, scale=None):
        self.t = temp
        self.scale = scale
        self.call_temp = {'c': {'c': self, 'f': self.celsius_to_fahrenheight, 'k': self.celsius_to_kelvin},
                          'f': {'f': self, 'c': self.fahrenheight_to_celsius, 'k': self.fahrenheight_to_kelvin},
                          'k': {'k': self, 'c': self.kelvin_to_celsius, 'f': self.kelvin_to_fahrenheight}}

    def celsius(t):
        if isinstance(t, int):
            return Temperature(t, 'c')
        else:
            return t.call_temp[t.scale]['c']()

    def fahrenheight(t):
        if isinstance(t, int):
            return Temperature(t, 'f')
        else:
            return t.call_temp[t.scale]['f']()

    def kelvin(t):
        if isinstance(t, int):
            return Temperature(t, 'k')
        else:
            return t.call_temp[t.scale]['k']()

    def __call__(self):
        return self.t

    def celsius_to_fahrenheight(self):
        f = (self.t)/5 + 32
        return round(f,2)

    def celsius_to_kelvin(self):
        k = self.t + 273
        return round(k,2)

    def fahrenheight_to_celsius(self):
        c = 5*(self.t-32)/9
        return round(c,2)

    def fahrenheight_to_kelvin(self):
        k = 5*(self.t-32)/9 + 273
        return round(k,2)

    def kelvin_to_celsius(self):
        c = self.t - 273
        return round(c,2)

    def kelvin_to_fahrenheight(self):
        f = 9*(self.t)/5 + 32
        return round(f,2)

t1 = Temperature(32)
print(t1.celsius_to_kelvin())

print('C 32 to K', Temperature.celsius(32).kelvin())
c1 = Temperature.celsius(30)
print('C 30 to K', c1.kelvin())
print('C 30 to F', c1.fahrenheight())
print('C 30 itself', c1())