Age in Months Calculator: How Many Months Old Am I?

Calculate your exact age in months instantly. Enter your birth date to see total months lived, plus weeks and days. Example: someone born January 1990 is 433 months old as of February 2026 (36 years, 1 month) — or 1,879 weeks, or 13,152 days. Commonly used for baby milestones, forms, and planning.

Quick reference: months to years conversion

See how many months equal specific ages. Use the calculator below for your exact months based on your birth date:

Age	Months	Age	Months
1 year old	12 months	30 years old	360 months
2 years old	24 months	35 years old	420 months
3 years old	36 months	40 years old	480 months
5 years old	60 months	45 years old	540 months
10 years old	120 months	50 years old	600 months
15 years old	180 months	60 years old	720 months
20 years old	240 months	70 years old	840 months
25 years old	300 months	80 years old	960 months

Formula: Years × 12 = Months. Example: 36 years × 12 = 432 months. Use the calculator above for your exact total months including partial months from your specific birth date.

Date of birth

Results update automatically

If you only know your birth year, start with the birth year hub.

What "age in months" means and when it's useful

How age in months is calculated

"Age in months" is the total number of completed calendar months since your date of birth. The calculator counts full months, then optionally shows remaining weeks and days for precision.

Example calculation:

Birth date: January 15, 1990
Today: February 17, 2026
Age in months: 433 months (36 years × 12 + 1 month)
Total weeks: 1,879 weeks
Total days: 13,181 days

When people use age in months

Baby milestones: Pediatricians track development in months for the first 2-3 years (e.g., "18 months old")
School enrollment: Age cutoffs often specified in months (e.g., "must be 36 months old by September 1")
Medical forms: Some forms request age in months for young children
Curiosity: Seeing total months lived provides perspective on time (e.g., "I've been alive for 480 months")
Planning: Calculating months between milestones or deadlines

Months vs years: when to use each

Use months when precision matters (babies, medical records, school forms). Use years for general age (adults, informal contexts). For exact age in years, months, and days, use the main age calculator.

Common age-in-months scenarios

How many months old is a 2-year-old?

A 2-year-old child is 24 months old. Pediatricians often use months instead of years for children under 3 because development milestones happen quickly in early childhood. Example milestones: 18 months (walking, first words), 24 months (running, two-word phrases), 30 months (potty training readiness).

How many months is 36 years?

36 years equals 432 months (36 × 12 = 432). Someone born in January 1990 is approximately 433 months old as of February 2026, accounting for the one additional month past their 36th birthday. Use the calculator above for your exact total based on your specific birth date.

How many months old am I if I was born in 2000?

If you were born in 2000, you are approximately 312 months old in 2026 (26 years × 12). The exact number depends on your birth month and whether your birthday has occurred yet this year. Enter your specific birth date in the calculator above for precise results.

432 months is how many years?

432 months equals 36 years (432 ÷ 12 = 36). Reverse conversions like this are useful when you see months listed on forms or records and want to know the equivalent age in years. Use the reference table above for common conversions, or divide any month total by 12 to get years.

More age tools

Age calculator — your exact age today (and age on any date).
Age in future year — how old you’ll be in 2030 (or any year).
Age difference calculator — age gap between two people.
Half birthday calculator — your next half birthday date.
Birthday countdown — days until your next birthday.
Age between two dates — exact difference between dates.
Retirement age calculator — estimate retirement date and time left.

Age in months calculator: FAQs

How do I calculate my age in months?

Enter your birth date in the calculator above. The tool automatically calculates your total months lived, plus optional weeks and days. Formula: (Years × 12) + additional months. Example: someone 36 years and 1 month old is 433 months old (36 × 12 + 1 = 433).

How many months old am I if I was born in 1990?

If you were born in 1990, you are approximately 432-433 months old in 2026, depending on your birth month and whether your birthday has occurred yet. Use the calculator above with your exact birth date for precise results.

How many months is 30 years?

30 years equals 360 months (30 × 12 = 360). Use the reference table above for other common year-to-month conversions, or multiply any age in years by 12 to get months.

Does this calculator include partial months?

The calculator shows completed calendar months. It can also display extra details like remaining weeks and days for more precision. Example: 433 months and 2 days = 36 years, 1 month, 2 days.

What's the difference between age in months and age in years?

Age in months is total months lived (e.g., 433 months). Age in years is rounded to completed years (e.g., 36 years). Months provide more precision, especially for young children where developmental milestones happen monthly. For standard age calculation, use the main age calculator.

Does this account for leap years?

Yes. The calculator follows standard calendar rules, including leap years and varying month lengths (28-31 days), to ensure accurate month and day calculations.

Do you store my date of birth?

No. All calculations run locally in your browser. No birth dates or personal data are saved, transmitted, or stored on any server. Full privacy guaranteed. Learn more on our privacy page.