Triglyceride Unit Converter
Triglyceride Unit Converter
Convert triglycerides between mg/dL, mmol/L, g/L and mg/L — and see why the molar value is a nominal unit conversion rather than a true molar concentration.
Triglyceride converter
Mass ⇄ molarTriglycerides 180 mg/dL
Formula and conversion factor
mg/dL = mmol/L × 88.57
- 0.0113
- derived by treating serum triglyceride as triolein, molecular weight 885.4 Da: 1 mg/dL is 0.01 g/L, and 0.01 ÷ 885.4 mol/L is 0.0113 mmol/L
- triolein
- a convention, not a measurement — real serum triglyceride is a mixture of species with different fatty acid chains, so the molar figure is nominal
- 0.0259
- the cholesterol factor, from a molecular weight of 386.65 Da; applying it to a triglyceride overstates the result by more than twofold
- g/L
- occasionally used in continental European reports; 1 g/L is 100 mg/dL
Worked example
Triglycerides 180 mg/dL
180 × 0.0113 = 2.03 mmol/L
= 1800 mg/L = 1.800 g/L
Above the desirable fasting limit of 150 mg/dL (1.7 mmol/L), in the borderline high band
Triglyceride classification in both units
| Triglycerides (mg/dL) | Triglycerides (mmol/L) | Category |
|---|---|---|
| < 150 | < 1.7 | Normal |
| 150 – 199 | 1.7 – 2.2 | Borderline high |
| 200 – 499 | 2.3 – 5.6 | High |
| ≥ 500 | ≥ 5.6 | Very high — pancreatitis risk |
The same triglyceride in four units
| mg/dL | mmol/L | g/L | mg/L |
|---|---|---|---|
| 150 | 1.69 | 1.500 | 1500 |
| 180 | 2.03 | 1.800 | 1800 |
| 500 | 5.65 | 5.000 | 5000 |
Why the molar value is nominal, and where the thresholds fall
The factor of 0.0113 mmol/L per mg/dL is derived by treating serum triglyceride as triolein, molecular weight 885.4 Da. A concentration of 1 mg/dL is 0.01 g/L, and dividing that by 885.4 g/mol gives 1.13 × 10⁻⁵ mol/L, or 0.0113 mmol/L. The reciprocal, 88.57, converts in the other direction. Every published triglyceride conversion rests on that single assumed molecular weight.
Real serum triglyceride is not triolein. It is a mixture of triacylglycerol species with different fatty acid chains and therefore different molecular weights, and the mixture varies between people and with diet. The molar figure is consequently nominal: it should be treated as a unit conversion that allows reports and thresholds to be compared internationally, not as a true molar concentration of a defined substance. This is also why the cholesterol factor of 0.0259 must never be used on a triglyceride — the two are different molecules, and the error is more than twofold.
The thresholds carry across cleanly enough. A desirable fasting triglyceride is below 150 mg/dL, about 1.7 mmol/L; 150 to 199 mg/dL is borderline high; 200 to 499 mg/dL is high, with 200 mg/dL corresponding to roughly 2.3 mmol/L; and 500 mg/dL, about 5.6 mmol/L, marks the point at which the clinical question changes. Above it the dominant concern is acute pancreatitis rather than atherosclerotic risk, and management shifts towards urgent triglyceride lowering, removal of precipitants such as alcohol and uncontrolled diabetes, and a fibrate or omega-3 preparation.
One practical point about sampling. Non-fasting triglycerides run higher than fasting ones, typically by a modest amount in people without marked hypertriglyceridaemia, and most current guidance accepts a non-fasting lipid profile for routine screening and risk assessment. A fasting sample is still preferred when the triglyceride is markedly raised, when a Friedewald LDL is required, or when the result will guide treatment of hypertriglyceridaemia itself. Note the fasting state on the request, because the same number means different things with and without it.
Frequently asked questions
How do I convert triglycerides from mg/dL to mmol/L?
Multiply by 0.0113, or divide by 88.57. A triglyceride of 150 mg/dL is about 1.7 mmol/L, and 180 mg/dL is 2.03 mmol/L.
Why is the triglyceride factor different from the cholesterol factor?
Because they are different molecules. Cholesterol has a molecular weight of 386.65 Da giving a factor of 0.0259, while triglyceride is conventionally taken as triolein at 885.4 Da giving 0.0113. Using the cholesterol factor on a triglyceride overstates it by more than twofold.
Is the mmol/L value a true molar concentration?
Not strictly. Serum triglyceride is a mixture of species with different molecular weights, so the conversion assumes triolein for convenience. The SI value is best read as a unit conversion rather than as a molar concentration of a defined substance.
Do I need to fast for a triglyceride test?
Not for routine screening — most current guidance accepts a non-fasting lipid profile, and non-fasting values run only modestly higher. Fasting is still preferred when triglycerides are markedly raised or when a Friedewald LDL is being calculated.
What triglyceride level risks pancreatitis?
Risk rises steeply above 500 mg/dL (about 5.6 mmol/L) and is substantial above 1000 mg/dL. At those levels pancreatitis, rather than atherosclerotic risk, becomes the dominant reason to treat.
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References
- Nordestgaard BG, Langsted A, Mora S, et al. Fasting is not routinely required for determination of a lipid profile: clinical and laboratory implications. Eur Heart J. 2016;37(25):1944–1958.
- Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults. Third Report of the National Cholesterol Education Program (NCEP) Expert Panel (Adult Treatment Panel III) final report. Circulation. 2002;106(25):3143–3421.
- Rifai N, Horvath AR, Wittwer CT, eds. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. 6th ed. Elsevier; 2018.