**Introduction**

Calculating age is a common task, and when precision matters, an age calculator by months becomes a valuable tool. This article provides a step-by-step guide on how to use and implement an accurate age calculator using HTML and JavaScript.

**How to Use**

To use the age calculator, input the birthdate in the designated field. The calculator will then provide the age in months when you click the “Calculate” button.

**Formula**

The formula for calculating age in months involves considering the number of months between the birthdate and the current date, accounting for leap years. The accurate formula is:

$Age in Months=(Current Year−Birth Year)×12+(Current Month−Birth Month)$

**Example**

Suppose the birthdate is January 15, 1990, and the current date is January 6, 2024. Using the formula:

$Age in Months=(2024−1990)×12+(1−1)=408months$

**FAQs**

**Q: How accurate is this age calculator by months?**

A: The calculator utilizes precise formulas to calculate age, considering leap years and months accurately.

**Q: Can I use this calculator for future dates?**

A: No, this calculator is designed to calculate the age as of the current date.

**Q: Is there a limitation on the input format?**

A: The input should be in the format YYYY-MM-DD for accurate calculations.

**Conclusion**

The age calculator by months presented here offers a precise solution for determining age in months. It can be beneficial in various contexts, such as medical calculations or age-related studies.