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Vietnamese Lunar Age Calculator (Tuổi Mụ & Tuổi Ta)

Calculate both Vietnamese age systems from your birth year. Tuổi ta (tuổi đời) is the standard calendar age: current year minus birth year. Tuổi mụ is the traditional Vietnamese lunar age, which counts the birth year itself as year 1 — so a person born in 1990 is already 1 year old at birth and turns 2 on the next Lunar New Year. Tuổi mụ is commonly used in traditional ceremonies, paperwork, and cultural contexts in Vietnam.

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How to use

Calculate both Vietnamese age systems from your birth year. Tuổi ta (tuổi đời) is the standard calendar age: current year minus birth year. Tuổi mụ is the traditional Vietnamese lunar age, which counts the birth year itself as year 1 — so a person born in 1990 is already 1 year old at birth and turns 2 on the next Lunar New Year. Tuổi mụ is commonly used in traditional ceremonies, paperwork, and cultural contexts in Vietnam.

How it's calculated

Tuổi Ta (Calendar Age)

current_year - birth_year

Standard calendar age: current year minus birth year

Tuổi Mụ (Lunar Age)

current_year - birth_year + 1

Traditional Vietnamese lunar age: counts birth year as year 1

Examples

Born 1990, current year 2026 → tuổi ta = 36, tuổi mụ = 37

  • Birth Year:1,990
  • Current Year:2,026

Born 2000, current year 2026 → tuổi ta = 26, tuổi mụ = 27

  • Birth Year:2,000
  • Current Year:2,026

Frequently Asked Questions

What is the difference between tuổi mụ and tuổi ta?

Tuổi ta (also called tuổi đời) is the standard age calculated by subtracting your birth year from the current year. Tuổi mụ is the traditional Vietnamese lunar age, which counts the year of birth as year 1 — making it always 1 year higher than tuổi ta.

When is tuổi mụ used in Vietnam?

Tuổi mụ is used in traditional ceremonies such as thôi nôi (first birthday), đám cưới (weddings), and other cultural rites. It also appears in some traditional paperwork and is the age system referenced in many folk customs.

Does tuổi mụ change on Tết or on the solar birthday?

In traditional practice, tuổi mụ increases on Tết Nguyên Đán (Lunar New Year), not on the individual's solar birthday. This means everyone gains a year of tuổi mụ at the same time each year.

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