Triglyceride-to-HDL Ratio Calculator
Calculate the TG:HDL ratio from a standard fasting lipid panel. Elevated TG:HDL is a well-validated surrogate marker for insulin resistance and small dense LDL particle pattern. Supports mg/dL and mmol/L. Educational use only.
❤️ TG:HDL Ratio Calculator
TG:HDL Ratio Result
Interpretation
mg/dL
mg/dL
pattern
TG:HDL Ratio Reference Ranges
| TG:HDL (mg/dL) | TG:HDL (mmol/L) | IR Risk | CVD Risk |
|---|---|---|---|
| < 1.0 | < 0.44 | Very low | Low |
| 1.0 – 2.0 | 0.44 – 0.88 | Low to normal | Low to moderate |
| 2.0 – 3.0 | 0.88 – 1.33 | Borderline | Moderate |
| > 3.0 | > 1.33 | Likely insulin resistance | Elevated |
| > 6.0 | > 2.65 | Significant resistance | High — evaluate further |
Note: mmol/L thresholds differ from mg/dL because TG and HDL use different conversion factors (TG ÷ 88.57, HDL ÷ 38.67). The mg/dL thresholds are most widely cited in North American guidelines.
Formula & Clinical Rationale
Insulin resistance promotes hepatic VLDL overproduction (raising TG) and impairs HDL synthesis (lowering HDL), making the TG:HDL ratio a metabolic fingerprint of IR. A TG:HDL ratio > 3.0 in mg/dL also correlates strongly with LDL Pattern B (small, dense particles) — a more atherogenic lipoprotein phenotype than pattern A (large, buoyant LDL).
Why your lipid panel hints at insulin resistance
You might not expect a cholesterol test to say anything about insulin, but the two are closely linked. When cells resist insulin, the liver tends to pump out more triglyceride-rich particles and HDL ("good") cholesterol drops. The result is a recognisable signature — high triglycerides paired with low HDL — that often appears before fasting glucose budges. Dividing one by the other turns that signature into a single, easy number you can pull from a routine lipid panel without any special insulin test.
That accessibility is the ratio's biggest strength. Almost everyone has had a standard cholesterol panel, so the triglyceride-to-HDL ratio offers a no-extra-cost window into metabolic health when a fasting insulin result isn't on hand.
What a high triglyceride-to-HDL ratio suggests
A higher ratio generally points toward greater insulin resistance and a less favourable cardiovascular risk profile, while a lower ratio is reassuring. As a rough guide, ratios below about 2 (using mg/dL) are considered good, the middle ground warrants attention, and values climbing toward 4 or above are commonly linked with insulin resistance and the small, dense LDL particles tied to heart disease.
Units change the numbers
Cut-offs depend on whether your lab reports in mg/dL or mmol/L, because the two scales produce very different ratios. Always check which units your panel uses before comparing your result to a published threshold, and let the tool handle the conversion for you.
When the TG:HDL ratio can mislead
The ratio is a surrogate, not a direct measurement, so it has blind spots. Most importantly, it performs less reliably in people of African descent, in whom insulin resistance often occurs without the high-triglyceride pattern — meaning a normal ratio doesn't rule resistance out. Triglycerides also swing with recent meals and alcohol, so a non-fasting sample can distort the result. Treat a concerning ratio as a prompt to look further with HOMA-IR or a fasting insulin, and to discuss the full picture with your clinician.
Frequently Asked Questions
What is a good triglyceride-to-HDL ratio?
In mg/dL, a ratio below 2.0 is optimal and below 1.0 is very low risk. A ratio of 2.0–3.0 is borderline, and above 3.0 suggests insulin resistance and higher cardiovascular risk. In mmol/L the resistance threshold is about 1.3.
How do you calculate the TG:HDL ratio?
Divide your fasting triglycerides by your HDL cholesterol, using the same units for both. For example, 150 mg/dL triglycerides ÷ 50 mg/dL HDL = 3.0.
Why does the TG:HDL ratio reflect insulin resistance?
Insulin resistance drives the liver to overproduce triglycerides and lowers HDL, so a high TG:HDL ratio is a lipid fingerprint of IR. It also correlates with small, dense (Pattern B) LDL particles, which are more atherogenic.
Do mg/dL and mmol/L use the same TG:HDL threshold?
No. Because triglycerides and HDL convert with different factors, the thresholds differ: about 3.0 in mg/dL versus about 1.3 in mmol/L. Use the threshold that matches your lab's units.
Sources
- McLaughlin T et al. "Use of metabolic markers to identify overweight individuals who are insulin resistant." Ann Intern Med. 2003;139(10):802–809.
- Gasevic D et al. "The association between triglyceride to HDL cholesterol ratio and insulin resistance." Clin Biochem. 2012.
Last reviewed: June 2025