Fundal Height Calculator (Pregnancy)
Fundal Height Calculator estimates gestational age from fundal height (distance from symphysis pubis to uterine fundus). Enter fundal height in cm to estimate weeks of gestation and assess fetal growth.
Formula
Fundal Height (cm) ≈ Weeks of Gestation (weeks 12–36); From 20 weeks: symphysis-to-fundus distance correlates with fetal age
- Fundal height = distance from symphysis pubis to uterine fundus in centimeters
- Rule of thumb (weeks 20–36): Fundal Height (cm) ≈ Weeks of Gestation
- Typical range: ±1–2 cm variation due to maternal build, amniotic fluid, placental position
- Most accurate between 16–26 weeks; less reliable in 3rd trimester
- Ultrasound is gold standard for dating; this is a clinical screening tool only
Fundal height 24 cm
Inputs
- Fundal Height (cm): 24 cm
24 cm ≈ 24 weeks gestation (approximately 6 months); range likely 22–26 weeks
Frequently asked questions
What is fundal height?
Fundal height is the distance in centimeters from the lower edge of the pubic bone (symphysis pubis) to the top of the uterus (fundus), measured with a tape measure during pregnancy.
Why measure fundal height?
Fundal height is used to estimate gestational age, assess fetal growth, detect multiple pregnancies, and screen for complications.
How accurate is this calculator?
Fundal height is a screening tool with ±2 cm accuracy. Ultrasound is more accurate for dating, especially in early pregnancy.