Cholesterol Ratio Calculator.

A total cholesterol of 220 tells you almost nothing on its own — it could belong to a very healthy person with high protective HDL, or a high-risk person with low HDL and elevated triglycerides. Ratios put the numbers in context. The total-to-HDL ratio captures how much of your cholesterol is riding in protective versus atherogenic particles, and in large cohorts it predicts heart disease better than total or LDL cholesterol alone.

The target for total/HDL is below 3.5; around 5 is average; above 5 signals elevated risk. You lower it from either side — raising HDL (aerobic exercise is the strongest lever) or lowering the triglyceride-rich particles that crowd it.

Of the three, triglyceride/HDL is the one worth watching most closely, because it doubles as a cheap proxy for insulin resistance. A ratio under 2 (in mg/dL) suggests good insulin sensitivity and predominantly large, buoyant LDL particles. Above 4 flags insulin resistance and a shift toward small, dense LDL — the pattern most associated with plaque.

Because the cut-points were validated in mg/dL, they do not translate directly to mmol/L (triglycerides and cholesterol convert with different factors). This calculator converts everything to mg/dL before applying the thresholds, so the interpretation holds whichever units you enter.

Ratios are indicators, not particle counts. Two people with an identical total/HDL ratio can carry very different numbers of atherogenic particles — and it is particle number, measured directly as ApoB, that drives risk. If your ratios are borderline or you have a family history, ApoB (or an NMR LDL-particle count) is the more direct measurement.

Use these ratios to spot patterns and track trends over time, not as a diagnosis. Any abnormal result is a conversation to have with a clinician, alongside the rest of your risk picture.