{"id":23081,"date":"2026-07-16T20:45:23","date_gmt":"2026-07-16T20:45:23","guid":{"rendered":"https:\/\/www.youragecalculator.com\/blog\/?p=23081"},"modified":"2026-07-16T20:45:23","modified_gmt":"2026-07-16T20:45:23","slug":"fetal-age-calculator-how-to-track-your-pregnancy-weeks","status":"publish","type":"post","link":"https:\/\/www.youragecalculator.com\/blog\/fetal-age-calculator-how-to-track-your-pregnancy-weeks\/","title":{"rendered":"Fetal Age Calculator: How to Track Your Baby\u2019s Development Week by Week"},"content":{"rendered":"\n

If you are pregnant or planning a pregnancy, you will hear terms like gestational age, fetal age, and due date thrown around at every appointment. These numbers tell very different stories about your baby\u2019s development. Understanding the difference between them helps you track exactly where your pregnancy stands. Our Fetal Age Calculator<\/a> makes it easy to convert between these measurements and see your baby\u2019s current developmental stage at a glance.<\/p>\n\n\n\n

Gestational Age vs. Fetal Age: What\u2019s the Difference?<\/h2>\n\n\n\n

Gestational age<\/strong> is measured from the first day of your last menstrual period (LMP) and is the standard number your doctor uses. It is approximately two weeks ahead of the actual fertilization date.<\/p>\n\n\n\n

Fetal age<\/strong> (also called conceptual age) is measured from the actual date of conception, which typically occurs about two weeks after your LMP. Fetal age is usually around two weeks less than gestational age.<\/p>\n\n\n\n

Term<\/th>Starting Point<\/th>Typical Duration<\/th><\/tr><\/thead>
Gestational Age<\/td>First day of LMP<\/td>40 weeks<\/td><\/tr>
Fetal Age<\/td>Conception date<\/td>38 weeks<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Why Fetal Age Matters for Development Tracking<\/h2>\n\n\n\n

Fetal age gives you a more accurate picture of when your baby\u2019s organs, limbs, and senses actually started forming. Key milestones are tied to fetal age:<\/p>\n\n\n\n