What is the Metabolic Syndrome Calculator?
This tool applies the widely used NCEP ATP III (National Cholesterol Education Program, Adult Treatment Panel III) definition of metabolic syndrome. Metabolic syndrome is a cluster of conditions — abdominal obesity, abnormal blood lipids, high blood pressure and elevated blood sugar — that together raise the risk of heart disease, stroke and type 2 diabetes. You are considered to have metabolic syndrome when you meet 3 or more of 5 criteria. This calculator is for educational use and uses common US/clinical reference thresholds; it is not a substitute for medical advice.
The 5 criteria
Each criterion counts as one point:
1. Waist circumference > 102 cm (men) or > 88 cm (women).
2. Triglycerides \(\geq 150\) mg/dL.
3. HDL cholesterol < 40 mg/dL (men) or < 50 mg/dL (women).
4. Blood pressure \(\geq 130\) systolic OR \(\geq 85\) diastolic mmHg.
5. Fasting blood glucose \(\geq 100\) mg/dL.
The number of criteria met is:
$$n = \mathbb{1}[\text{waist}] + \mathbb{1}[\text{TG}] + \mathbb{1}[\text{HDL}] + \mathbb{1}[\text{BP}] + \mathbb{1}[\text{FBG}]$$and a positive result is given by:
$$\text{Positive if } \sum_{i=1}^{5} \text{criterion}_i \geq 3 \quad\Longleftrightarrow\quad \text{MetS} = (n \geq 3)$$
How to use it
Select your sex (it changes the waist and HDL thresholds), then enter your waist measurement, triglycerides, HDL, systolic and diastolic blood pressure, and fasting glucose. The calculator flags which criteria are met, totals them, and tells you whether you reach the \(\geq 3\) threshold.
Worked example
A man with waist 100 cm, triglycerides 160, HDL 38, BP 135/88, glucose 105. Waist 100 is not > 102 (not met). TG \(160 \geq 150\) (met). HDL \(38 < 40\) (met). BP \(135 \geq 130\) (met). Glucose \(105 \geq 100\) (met). That is 4 of 5 criteria — at or above 3, so the result is positive for metabolic syndrome.
$$n = 0 + 1 + 1 + 1 + 1 = 4 \geq 3$$
FAQ
Does the unit matter? Yes. This tool uses mg/dL for lipids and glucose and cm for waist. Convert mmol/L to mg/dL first (glucose \(\times 18\), triglycerides \(\times 88.5\), cholesterol \(\times 38.67\)).
Why do thresholds differ by sex? Healthy waist and HDL ranges differ between men and women, so the ATP III criteria set sex-specific cutoffs.
Do medications count? In the formal definition, being on treatment for high BP, low HDL or high glucose also satisfies that criterion. This calculator scores by measured values only, so enter values reflecting your current status.
