Metabolic Syndrome Calculator
Check the five metabolic syndrome criteria and see how many are met.
What it does
Metabolic syndrome is a cluster of conditions that raise the risk of type 2 diabetes, heart disease, and stroke. It is not a single disease and it has no single test. Instead, clinicians count how many of five specific criteria a person meets. Three or more criteria on the same assessment is the usual definition.
The five criteria are abdominal obesity, high triglycerides, low HDL cholesterol, elevated blood pressure, and elevated fasting glucose. Each one has a threshold, and the waist and HDL thresholds differ by sex. The thresholds used here are the ones published by the National Heart, Lung, and Blood Institute and the American Heart Association.
Treatment status matters. If a person takes medicine for high blood pressure, triglycerides, low HDL, or high glucose, that criterion counts as present even when the current reading is at goal. This calculator includes a treatment selector for each of those four categories so the count reflects the clinical definition rather than a snapshot of untreated values.
The waist threshold is 88 cm (35 in) for women and 102 cm (40 in) for men in the NHLBI definition. Some guidelines use lower waist cutoffs for people of South Asian, Chinese, Japanese, or other ancestries. A clinician may apply those stricter numbers, so the result here can differ from a clinical assessment.
This is a screening aid. It does not diagnose metabolic syndrome by itself, and it does not replace a fasting lipid panel, glucose test, or blood pressure measurement taken under proper conditions. Bring the result to a clinician for interpretation.
How to use
- Pick metric or imperial units and the sex used for waist and HDL thresholds.
- Measure waist at the top of the hip bone, keeping the tape level and snug but not tight.
- Enter triglycerides, HDL, and fasting glucose from a recent blood test.
- Enter systolic and diastolic pressure from a rested reading.
- Mark any blood pressure, triglyceride, HDL, or glucose medicine that is currently in use.
- Read the count, the status, and the list of criteria that are met.
Formula
- waist
- Waist circumference in cm or in.
- TG
- Triglycerides in mmol/L or mg/dL.
- HDL
- HDL cholesterol in mmol/L or mg/dL.
- BP
- Systolic and diastolic pressure in mm Hg.
- FPG
- Fasting plasma glucose in mmol/L or mg/dL.
The imperial thresholds are 35 in waist for women, 40 in for men, 150 mg/dL triglycerides, 50 mg/dL HDL for women, 40 mg/dL for men, and 100 mg/dL fasting glucose. The tool converts imperial values to metric with standard factors and then applies the same cutoffs. A treated criterion counts as met even when the treated value is below the cutoff.
Worked example
Example: four criteria in a female patient
Metric defaults: female, waist 90 cm, triglycerides 1.8 mmol/L, HDL 1.2 mmol/L, blood pressure 128/82, fasting glucose 5.8 mmol/L, no treatment.
- Waist: 90 cm is at or above the 88 cm threshold, so the waist criterion is met.
- Triglycerides: 1.8 mmol/L is at or above 1.7, so the triglyceride criterion is met.
- HDL: 1.2 mmol/L is below the 1.3 threshold for women, so the HDL criterion is met.
- Blood pressure: 128/82 is below 130/85, so this criterion is not met.
- Fasting glucose: 5.8 mmol/L is at or above 5.6, so the glucose criterion is met.
- The count is 4 of 5, which is at or above 3, so the status is Meets criteria.
- The tool lists Waist, Triglycerides, HDL, and Fasting glucose and shows the 88 cm (35 in) waist threshold.
Reference table
| Criterion | Women | Men |
|---|---|---|
| Waist | >= 88 cm (35 in) | >= 102 cm (40 in) |
| Triglycerides | >= 1.7 mmol/L (150 mg/dL) | >= 1.7 mmol/L (150 mg/dL) |
| HDL cholesterol | < 1.3 mmol/L (50 mg/dL) | < 1.0 mmol/L (40 mg/dL) |
| Blood pressure | >= 130/85 mm Hg | >= 130/85 mm Hg |
| Fasting glucose | >= 5.6 mmol/L (100 mg/dL) | >= 5.6 mmol/L (100 mg/dL) |
Limits
- The calculator uses one common adult definition. It does not apply lower waist thresholds used for several Asian populations or pediatric cutoffs.
- A single reading can be misleading. Blood pressure and glucose should be confirmed on repeat testing before a diagnosis is made.
- The tool does not include medication doses, other lipid measures such as LDL, or risk scores for heart disease.
- Pregnancy, acute illness, and some medicines can change triglycerides and glucose, so the count may not reflect the usual state.
Common mistakes
- Counting a treated condition as absent because the current reading is at goal. Treatment itself makes the criterion count.
- Using the wrong sex specific waist or HDL cutoff.
- Measuring the waist at the navel instead of the top of the hip bone, which can add several centimeters.
- Entering a random glucose value instead of a fasting value, which lowers the apparent glucose criterion.
- Treating a count of 2 as harmless when a single additional risk factor would cross the diagnostic line.
Try it yourself
Quick checks. Answers sit tucked under each question.
A man has a 104 cm waist, triglycerides 1.6 mmol/L, HDL 0.9 mmol/L, blood pressure 138/88, and fasting glucose 5.4 mmol/L. How many criteria are met?
3 of 5: waist, HDL, and blood pressure. The status is Meets criteria.
A woman has an 85 cm waist, triglycerides 2.0 mmol/L, HDL 1.5 mmol/L, blood pressure 120/76, and fasting glucose 5.2 mmol/L. How many criteria are met?
1 of 5: triglycerides only. The status is Does not meet criteria.
A woman has a 96 cm waist, triglycerides 1.2 mmol/L, HDL 1.1 mmol/L, blood pressure 126/80, and fasting glucose 5.9 mmol/L. How many criteria are met?
3 of 5: waist, HDL, and fasting glucose. The status is Meets criteria.
Questions
Is metabolic syndrome the same as prediabetes?
No. Prediabetes is defined by a glucose or A1C range. Metabolic syndrome is a cluster of five risk factors, and a person can have it with normal glucose.
Do I need to fast for this calculator?
The glucose criterion uses a fasting value, so a fasting sample is preferred. Triglycerides are also usually measured after a fast, though nonfasting values can still be interpreted.
Can metabolic syndrome be reversed?
The cluster often improves with weight loss, activity, and treatment of individual risk factors. Whether it resolves depends on how many criteria change and on the person's baseline.
Why are waist cutoffs different for men and women?
The published thresholds reflect different body fat distribution and risk patterns by sex. Some ethnic groups also use lower cutoffs because risk rises at a smaller waist.
Does taking a statin affect the count?
A statin can lower triglycerides and raise HDL, but the treatment flags in this tool cover blood pressure, triglycerides, HDL, and glucose medicine. A treated value still counts if the criterion was present before treatment.
Is one high reading enough to diagnose metabolic syndrome?
Clinical guidance usually confirms abnormal values on repeat testing. A single set of readings can be affected by stress, illness, or measurement error.
Sources
- National Heart, Lung, and Blood Institute, Metabolic syndrome diagnosis
- American Heart Association, About metabolic syndrome