The accurate measurements of the frequency of the nuclear energy level transition of 229Th base state to excited state 229mTh (the frequency of 229Th nuclear transition for short) is critical to realize nuclear clocks. On 04 December 2024 Prof. Jun Ye’s laboratory reported the most accurate measured value for this frequency, i.e., 2.020407384335(2)×1015 Hz, with 12 precise digits, and gave its ratio with the frequency of 87Sr optical atomic clock, i.e., 4.707072615078(5). In this paper, we construct reasonable formulas, and calculate out the reciprocal of the frequency of 229Th nuclear transition in atomic units, the reciprocal of the frequency of 87Sr optical atomic clock in atomic units and the ratio between them, which are 20.461899741458143308, 96.315647925496289349 and 4.7070726150783448253 respectively. As the most accurate measured frequency of 87Sr optical atomic clock is 429228004229872.99(8) Hz, we calculate out the frequency of 229Th nuclear transition which is 2020407384335167.11(38) Hz, with 15 precise digits. We also calculate out the more precise values of the atomic unit of time, which is 2.41888432658653284(45)×10-17 s, and hence calculate out more precise Rydberg constant, Hartree energy, Bohr radius, classical electron radius and electron mass.