About the Cholesterol Ratio Calculator
This cholesterol ratio calculator turns the numbers on a standard lipid panel — total cholesterol, HDL, LDL and triglycerides — into the ratios doctors use to judge heart risk. The headline is the total cholesterol to HDL ratio, which many clinicians find more informative than total cholesterol alone because it balances “bad” against “good” cholesterol.
You also get the LDL/HDL ratio, the triglyceride/HDL ratio (a marker linked to insulin resistance and small, dense LDL particles) and non-HDL cholesterol, which counts every cholesterol-carrying particle that can build up in arteries. Enter results in mg/dL or mmol/L; if your report does not list LDL, leave it at 0 and it will be estimated with the Friedewald formula.
Ratios are one piece of the picture. Your overall cardiovascular risk also depends on age, blood pressure, smoking, diabetes and family history — use the ASCVD risk calculator for a combined estimate.
With the default inputs, the total cholesterol / hdl ratio is 4. Change any value above to recalculate instantly.
How to use the cholesterol ratio calculator
- 1Choose mg/dL or mmol/L to match your lab report.
- 2Enter total cholesterol and HDL.
- 3Enter LDL, or leave it at 0 to have it estimated.
- 4Enter triglycerides (a fasting value is best).
- 5Read your ratios and compare them with the targets in the chart.
Formula and method
Each ratio divides one lipid value by HDL. Total/HDL and LDL/HDL are the same in mg/dL or mmol/L because both numbers are cholesterol. The triglyceride/HDL ratio depends on units, so values entered in mmol/L are converted to mg/dL first (cholesterol × 38.67, triglycerides × 88.57) and the ratio is reported on the mg/dL scale used in most research.
A total/HDL ratio below 3.5 is generally considered ideal and above 5 indicates higher risk. When LDL is left at 0 it is estimated with the Friedewald formula, LDL = TC − HDL − TG ÷ 5 (mg/dL), which is not valid when triglycerides are 400 mg/dL or more.
- TC
- Total cholesterol
- HDL
- High-density lipoprotein (“good”) cholesterol
- LDL
- Low-density lipoprotein (“bad”) cholesterol
- TG
- Triglycerides
Worked examples
Typical panel in mg/dL
200 ÷ 50 gives a total/HDL ratio of 4.0 — acceptable but above the ideal of 3.5. LDL/HDL is 120 ÷ 50 = 2.4, TG/HDL is 150 ÷ 50 = 3.0, and non-HDL cholesterol is 200 − 50 = 150 mg/dL.
UK results in mmol/L, LDL estimated
5.2 ÷ 1.6 = 3.25, in the ideal range. Non-HDL is 3.6 mmol/L. Converting to mg/dL, TG/HDL is 97.4 ÷ 61.9 ≈ 1.57, and the Friedewald estimate of LDL is about 3.1 mmol/L (TC − HDL − TG ÷ 2.2).
Low HDL, high triglycerides
230 ÷ 35 = 6.6, well above 5. LDL/HDL is exactly 4, and a TG/HDL ratio of 7.9 strongly suggests insulin resistance — a pattern that responds well to weight loss, exercise and cutting refined carbohydrates and alcohol.
Frequently asked questions
What is a good total cholesterol to HDL ratio?+
Below 3.5 is generally considered ideal and below 5 acceptable. A ratio above 5 is associated with higher cardiovascular risk. For example, total cholesterol of 200 with HDL of 50 gives a ratio of 4.
Is the cholesterol ratio more important than LDL?+
Both matter. Treatment guidelines are built around LDL and overall risk, but the total/HDL ratio adds information about the balance of harmful and protective particles and is used in some risk scores, such as QRISK in the UK.
What does a high triglyceride to HDL ratio mean?+
A TG/HDL ratio above about 3–3.5 (in mg/dL) is linked to insulin resistance, metabolic syndrome and a higher proportion of small, dense LDL particles. Ratios below 2 are considered favourable.
What is non-HDL cholesterol?+
Non-HDL cholesterol is total cholesterol minus HDL. It captures LDL, VLDL and other atherogenic particles, and is a good target when triglycerides are high. Below 130 mg/dL (3.4 mmol/L) is usually desirable.
How can I improve my cholesterol ratio?+
Raising HDL and lowering LDL both help: regular aerobic exercise, not smoking, losing excess weight, replacing saturated fats with unsaturated fats, eating more fibre and limiting alcohol and refined carbohydrates. Statins lower LDL substantially.
This tool gives general estimates and is not medical advice. Talk to a doctor or qualified professional about your health, diet or training.