Gestational Age Calculator
Gestational Age Calculator is a health and wellness calculator that helps you calculate gestational age in weeks and days from the last menstrual period (LMP). The formula used is: Gestational age = (as-of date − LMP) in weeks and days. Enter values using the units shown next to each input field (e.g. kg, cm, years).
Formula
Gestational age = (as-of date − LMP) in weeks and days
- Gestational Age Calculator gives you a fast estimate using your inputs and updates instantly when you change any value.
- Formula: Gestational age = (as-of date − LMP) in weeks and days
- Enter values using the units shown next to each input field (e.g. kg, cm, years).
- This calculator uses widely accepted health formulas and returns screening estimates only. It does not replace a diagnosis from a qualified healthcare professional.
- Compare your result with published reference ranges. Values outside the normal range warrant a conversation with your doctor.
- Practical tip: test a low, medium, and high scenario to understand sensitivity before making decisions.
Example Calculation
Suppose you enter: your chosen values. The calculator applies the formula (Gestational age = (as-of date − LMP) in weeks and days) and shows all output values below. Change any input field to immediately see how the result changes.
Frequently asked questions
What is the Gestational Age?
The Gestational Age Calculator is a health and wellness calculator that helps you calculate gestational age in weeks and days from the last menstrual period (LMP). Enter values using the units shown next to each input field (e.g. kg, cm, years).
When should I use this calculator?
Use this calculator whenever you need a quick, accurate result for gestational age in weeks and days from the last menstrual period (LMP) without working through the arithmetic manually.
What units should I enter?
Enter values using the units shown next to each input field (e.g. kg, cm, years).
How accurate are the results?
This calculator uses widely accepted health formulas and returns screening estimates only. It does not replace a diagnosis from a qualified healthcare professional.
How do I interpret the result?
Compare your result with published reference ranges. Values outside the normal range warrant a conversation with your doctor.
How can I verify the calculation manually?
Use the displayed formula and work through the numbers step by step. If your manual result differs slightly, check rounding and unit conversions first.
Can I use this for planning and budgeting?
Yes. Run best-case, expected, and worst-case inputs to compare outcomes and make safer planning decisions.
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Due Date Calculator Due Date Calculator is a health and wellness calculator that helps you calculate date differences, days between dates, or future/past dates. The formula used is: EDD = LMP + 280 days (adjusted for cycle length)\nConception ≈ LMP + 14 days. Enter values using the units shown next to each input field (e.g. kg, cm, years). Pregnancy Trimester Calculator Pregnancy Trimester Calculator is a health and wellness calculator that helps you calculate a pregnancy or fetal development metric. The formula used is: Gestational age = today − LMP (in weeks)\nT1: weeks 1–12, T2: weeks 13–26, T3: weeks 27–40. Enter values using the units shown next to each input field (e.g. kg, cm, years). Conception Date Calculator Conception Date Calculator is a health and wellness calculator that helps you calculate date differences, days between dates, or future/past dates. The formula used is: From LMP: Conception = LMP + 14 days (cycle-adjusted)\nFrom due date: Conception = Due date − 266 days. Enter values using the units shown next to each input field (e.g. kg, cm, years).