The Planck temperature is the unit of temperature in the system of Planck units. It has the value:

T_p = 1.41 × 10³²K

In SI units, measurements of temperature are made in degrees Kelvin (usually given the symbol K). While the Kelvin is convenient for everyday usage, such as measuring the daytime temperature (around 300 K on a nice warm summer’s day) or a human’s normal body temperature (310 K = 37 degrees Celsius), a consequence of using SI units is that the fundamental constants take on values that are not always convenient for use in equations:

Speed of light	c = 299792458 m s-1
Gravitational constant	G = 6.673(10) x 10-11 m3 kg-1s-2
Plank’s constant (reduced)	= h/2π = 1.054571596(82) x 10-34 kg m2 s-1
Boltzmann constant	k = 1.3806502(24) x 10-23kg m2 s-2K-1

The Planck temperature is found using the relationship between energy and temperature:

T_p = E_p/k

where k is the Boltzmann constant, and E_p = m_pc² ( m_p is the Planck mass and c is the speed of light).

By redefining the base units for length, mass and time in terms of the Planck units, the fundamental constants have the values: c = G = = k = 1.