Gestational Diabetes Risk Calculator
A simple gestational-diabetes risk screen from common factors — BMI, age, family history, prior GDM and PCOS — to see whether earlier testing may be warranted.
How it works
Points: BMI 25–29.9 (+1) or ≥30 (+2) · age 35–39 (+1) or ≥40 (+2) · family history (+1) · prior GDM/large baby (+2) · PCOS/high-risk ethnicity (+1) · 0 lower, 1–3 moderate, ≥4 higher
This is a simplified educational screen, not a diagnostic test. Gestational diabetes risk rises with higher pre-pregnancy BMI, older maternal age, a family history of type 2 diabetes, a previous affected pregnancy or large baby, PCOS, and certain ethnic backgrounds. The score flags whether earlier or extra testing might be worth discussing. Everyone is normally screened with a glucose test around 24–28 weeks regardless of score.
Worked example
A 32-year-old with a pre-pregnancy BMI of 26 and no other factors scores 1 (overweight) — moderate risk, meaning routine 24–28 week screening applies and the BMI is worth mentioning to her provider.
Frequently asked questions
Does a low score mean I will not get gestational diabetes?
No. Some women with no risk factors still develop it, which is why nearly everyone is screened around 24–28 weeks. The score only indicates whether earlier or extra testing may be worth discussing.
How is gestational diabetes actually diagnosed?
With a glucose challenge and/or an oral glucose tolerance test, usually at 24–28 weeks, or earlier if risk is high. This calculator does not diagnose anything.
Can I lower my risk?
Entering pregnancy at a healthy weight, staying active and eating well can reduce risk, but some factors like age and family history cannot change. Discuss a plan with your provider.
Related calculators
Educational estimate only, not medical advice. Cycles, nutrient needs and risk vary between people — discuss decisions with a qualified clinician.