How to find out what is missing in the five elements and eight characters for free?

To find out what the five elements are missing, you can use the following methods: 1. Online: There are some online date of birth inquiry services. You can enter your date and time of birth, and the system will calculate the missing five elements according to your date of birth. 2. Manual calculation: You can manually calculate your date of birth according to the lunar calendar and date of birth, refer to the eight-character book or other related books, and then judge the missing five elements according to the distribution of the five elements in the eight-character book. No matter which method is adopted, it is recommended to compare and verify with multiple sources to get more accurate results.