Date2Thai

03 / AGE

Thai Age Calculator

Find the elapsed age between a birth date and any date you choose.

Calculate an age

Choose the era for each date. The as-of date starts at today’s date in Thailand.

Result

How age is counted

The calculator measures completed years, then completed months, then the remaining days. If an anniversary day falls beyond the end of a month, it uses the last day of that month. A February 29 birthday therefore has a February 28 anniversary in a non-leap year.

For example, someone born on 15 April 2533 B.E. (1990 A.D.) was exactly 35 years old on 15 April 2025.

Use the historical option if either date comes from an original Thai civil record before 1941. See the historical date explanation.

More calendar tools

Thai Year ConverterConvert B.E. and A.D. years as you type. Thai Date ConverterConvert a full date and read the month in Thai. Thai Age CalculatorFind your age from a B.E. or A.D. birthday.