How to Calculate Lunar Age

Lunar age (sometimes called “Chinese age”) can be counted differently from Western age. Different traditions may use slightly different rules, which is why people can get different chart matches.

Step-by-Step (Simple Rule)

  1. Start with your Western age.
  2. Add 1 year (traditional “virtual age” counting).
  3. Use the lunar age at the time of conception (not today).

Why Results Can Differ

  • Some traditions count age changes at Lunar New Year.
  • Some people mistakenly use their current age instead of the conception-time age.
  • Some people use Gregorian months instead of lunar months.

Best Practice for Using the Gender Chart

Use the same method consistently: calculate lunar age for the target date (usually conception date), then convert the conception date into the lunar conception month, then match the chart.

Ready to calculate? Use the Lunar Age Calculator.

Related Tools

Lunar Age CalculatorCalculate lunar age for a target date.Chinese Gender PredictorUse lunar age and lunar month to match the chart.Lunar Conception Month CalculatorConvert a date into the lunar conception month.How the Chinese Gender Calendar WorksLearn the full workflow and common mistakes.