The exponent of the inverse fine structure constant, exp α − 1 , used in conjunction with various combinations of the neutron, proton, and electron masses, permits the calculation of Planck mass as m P L = c / G = 2.176 433 6 ( 52 ) × 10 − 8 kg , where Newton’s gravitational constant is G = 6.674 305 ( 32 ) × 10 − 11 m 3 kg − 1 s − 2 , in excellent agreement with the 2024 experimental and statistical data which give G = 6.674 30 ( 15 ) × 10 − 11 m 3 kg − 1 s − 2 .
Terry Casey (Thu,) studied this question.