**For the first time, the empirically measured value of Planck's constant h is calculated from first principles of a physical theory to the full precision allowed by CODATA values.**Using the postulates of binary mechanics (BM) where both space and time are quantized [1], this report describes the key steps in this calculation and proposes values for the fundamental length d and time t constants.

(1) Bit velocity v was defined as greater than the speed of light in a vacuum c consistent with the BM constraint that v > c [2].

(2) A physical interpretation of BM space [3] suggested a proposed value for the fundamental BM length constant d as approximately 0.67 fm.

(3) d/v = t' = approximately 7.14E-25 s, the fundamental time constant in BM space-time.

(4) The fine structure constant α maps this quantized time unit t' from BM space to observational space with t = αt' = approximately 5.2124E-27 s.

(5) Intrinsic electron spin and hence the Planck constant h was calculated using only electron rest mass m

_{e}and the proposed length d and time t constants.

(6) In addition to steps (3) and (4) above, another method was used to calculate quantized time t based only on m

_{e}, h and quantized length d.

(7) Finally, eq. 9 calculates Planck constant h directly from the independently determined length constant d (step 2 above) and familiar physical constants.