TG/HDL Ratio Calculator
The triglycerides-to-HDL ratio is one of the simplest numbers you can pull from a standard lipid panel. Research links higher ratios to insulin resistance, smaller denser LDL particles, and higher cardiometabolic risk — all from two values you already have.
Fasting preferred
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How it works
The formula
TG/HDL ratio = triglycerides mg/dL ÷ HDL cholesterol mg/dL. If your panel reports mmol/L, convert triglycerides by multiplying by 88.57 and HDL by multiplying by 38.67 — or simply divide the two mmol/L values and multiply by 2.29 to approximate the mg/dL ratio.
What the ratio reflects
Triglycerides and HDL move in opposite directions when insulin sensitivity declines: triglycerides rise as the liver packages excess energy into VLDL particles, and HDL falls as those particles get remodeled. The ratio captures both shifts in one number.
Limitations
The ratio is unit-dependent — cut-offs cited here are for mg/dL. Non-fasting samples inflate triglycerides. The ratio does not replace a full lipid panel, ApoB, or clinical assessment.
Frequently asked questions
What is a good TG/HDL ratio?
Below 1.0 is considered optimal and 1.0–2.0 normal (in mg/dL units). Ratios above 2.0–3.0 are increasingly associated with insulin resistance and an atherogenic lipid pattern in research settings.
Why does this ratio matter more than triglycerides alone?
It captures two sides of the same process. High triglycerides with low HDL is a stronger signal of insulin resistance and small dense LDL particles than either value alone — which is why it appears so often in functional medicine assessments.
My labs are in mmol/L — can I still use this?
Yes, but convert first: multiply triglycerides mmol/L by 88.57 and HDL mmol/L by 38.67 to get mg/dL. The cut-offs on this page assume mg/dL — a ratio computed directly from mmol/L values will read ~2.3× lower.
Is a high TG/HDL ratio a diagnosis?
No. It is a screening marker from two routine lab values. A high ratio is a reason for a fuller workup — fasting insulin, glucose, ApoB, waist circumference — not a diagnosis by itself.
Sources
- McLaughlin T, et al. Use of metabolic markers to identify overweight individuals who are insulin resistant. Ann Intern Med, 2003.
- da Luz PL, et al. High ratio of triglycerides to HDL-cholesterol predicts extensive coronary disease. Clinics, 2008.
This calculator is for informational purposes only and is not medical advice, diagnosis, or treatment. Reference ranges are general population guidelines — always discuss your lab results with a qualified healthcare professional.