Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Gestational Diabetes Risk Calculator

Estimate your gestational diabetes risk score using BMI, age, family history, prior GD, and ethnicity. Use this during pregnancy planning or early prenatal care to identify and discuss risk factors with your provider.

Pre-pregnancy BMI (kg/m²)

Maternal Age (years)

Family History of Diabetes

Previous Gestational Diabetes

Ethnicity Risk Factor

Fill in the required fields to see your result.

Pregnancy

Due Date Calculator (Naegele's Rule)

Estimate your due date from your last menstrual period using Naegele's rule, adjusted for your actual cycle length and luteal phase so a non-28-day cycle isn't misdated.

Days since first day of last period (LMP) (days)

Average menstrual cycle length (days)

Luteal phase length (days)

Days until estimated due date

224 days

224

189

At or past dueThird trimesterSecond trimesterFirst trimester

More than 189 days until your due date puts you in the first trimester (under ~13 weeks), the window covering the dating ultrasound and initial prenatal visit.

Counts calendar days until your estimated due date using Naegele's rule (266 days from conception), so each band corresponds to a pregnancy trimester window.

Key differences

	Gestational Diabetes Risk Calculator	Due Date Calculator (Naegele's Rule)
Category	Pregnancy	Pregnancy
Inputs required	5	3
Result	Risk Score (%)	Days until estimated due date (days)
What it does	Estimate your gestational diabetes risk score using BMI, age, family history, prior GD, and ethnicity. Use this during pregnancy planning or early prenatal care to identify and discuss risk factors with your provider.	Estimate your due date from your last menstrual period using Naegele's rule, adjusted for your actual cycle length and luteal phase so a non-28-day cycle isn't misdated.