Cholesterol Ratio Calculator
Work out your total/HDL ratio, non-HDL and LDL with category ranges from a lipid panel.
TC/HDL ratio: —
—Your lipid panel
Reference ranges (mg/dL)
What this means & what helps
How to use the Cholesterol Ratio Calculator
Step 1 — Enter your panel
- Choose mg/dL or mmol/L, then enter total, HDL and triglycerides.
- Add LDL if you have it, or leave it blank to estimate it.
Step 2 — See your ratio
- Get your total-to-HDL ratio with a clear optimal/acceptable/high verdict.
- The donut shows the balance of LDL, HDL and other fats.
Step 3 — Read each number
- Every value — total, LDL, HDL, triglycerides, non-HDL — gets its own category.
- Compare against the unit-aware reference table.
Step 4 — Improve & share
- Read targeted, evidence-based tips for the numbers that need work.
- Download a PDF to review with your doctor.
Frequently asked questions
The total-cholesterol-to-HDL ratio divides your total cholesterol by your HDL ("good") cholesterol. Because it weighs the cholesterol that tends to deposit in arteries against the HDL that helps clear it, the ratio is often a better single predictor of cardiovascular risk than total cholesterol alone. Lower is better — aim below 5, and ideally below 3.5.
LDL ("bad") cholesterol carries cholesterol into artery walls, driving plaque, so lower is better. HDL ("good") cholesterol helps remove it, so higher is better. Triglycerides are a separate blood fat that rises with excess sugar, refined carbohydrate, alcohol and weight. Non-HDL cholesterol is simply total minus HDL — it captures all the harmful, atherogenic particles in one number and is increasingly used as a target.
When you leave LDL blank, the tool uses the Friedewald equation: LDL = Total − HDL − (Triglycerides ÷ 5) in mg/dL, or ÷ 2.2 in mmol/L. It is a long-established estimate used by most labs, but it becomes unreliable when triglycerides are high (above ~400 mg/dL or 4.5 mmol/L) or LDL is very low, in which case a direct LDL measurement is better.
As a general guide (mg/dL): total below 200, LDL below 100, HDL 60 or above is protective while below 40 (men) or 50 (women) is a risk, triglycerides below 150, and non-HDL below 130. In mmol/L the rough equivalents are total below 5.2, LDL below 2.6, HDL above 1.0–1.3, and triglycerides below 1.7. These are population reference points, not personal targets.
Because cholesterol goals are risk-based, not universal. Someone who already has heart disease or diabetes is given much stricter LDL targets than a low-risk young adult, because the benefit of lowering LDL depends on their overall cardiovascular risk. That is why this tool shows reference ranges for context but cannot tell you your personal target — only your doctor, weighing all your risk factors, can.
Not necessarily. A high total cholesterol driven partly by high (protective) HDL is less worrying than the same total with low HDL. This is exactly why the ratio and non-HDL are useful — they look past the total to the balance of particles. Always interpret the numbers together rather than fixating on the total alone.
Lifestyle changes can shift the numbers meaningfully: replace saturated and trans fats with unsaturated fats (olive oil, nuts, seeds, oily fish), eat more soluble fibre (oats, beans, fruit) and plant sterols, lose excess weight, exercise regularly, stop smoking (which raises HDL), and cut refined carbohydrate, sugar and alcohol to lower triglycerides. Recheck after about three months; if LDL stays high despite genuine effort, your doctor may discuss medication based on your overall risk.
Traditionally yes, mainly because triglycerides (and therefore a Friedewald-estimated LDL) are affected by recent eating. Increasingly, non-fasting lipid panels are accepted for general screening, with fasting reserved for when triglycerides are very high or being closely tracked. Follow whatever instruction your clinic gives.
About the Cholesterol Ratio Calculator
A cholesterol blood test (a "lipid panel") returns several numbers, and looking at any one of them in isolation — especially the headline total — can be misleading. This calculator takes your panel and works out the measures that actually matter for heart-disease risk: the total-to-HDL ratio, non-HDL cholesterol, and, if you don't have it to hand, an estimated LDL. It then classifies every value against widely used reference ranges, in either mg/dL or mmol/L, and explains what each one means and how to improve it.
The cholesterol family, in plain terms
Cholesterol is a waxy substance your body needs to build cells and hormones. Because it doesn't dissolve in blood, it travels packaged inside particles called lipoproteins, and the type of particle is what matters:
- LDL (low-density lipoprotein) — the "bad" cholesterol. LDL particles deposit cholesterol into artery walls, the first step in the plaque that causes heart attacks and strokes. Lower is better.
- HDL (high-density lipoprotein) — the "good" cholesterol. HDL helps carry cholesterol away from the arteries back to the liver. Higher is generally better and protective.
- Triglycerides. A separate type of blood fat used for energy storage. Levels rise with excess calories, sugar, refined carbohydrate, alcohol and body weight; high levels independently raise cardiovascular risk.
- Total cholesterol. Roughly LDL + HDL + a portion of the triglyceride-carrying particles. On its own it is a blunt instrument, because a high total could come from harmful LDL or from protective HDL.
Why ratios and non-HDL beat the total
The total-to-HDL ratio divides total cholesterol by HDL. By pitting the harmful particles against the protective ones, it often predicts cardiovascular risk better than the total alone — a high total cholesterol is far less concerning when much of it is HDL. As a guide, aim for a ratio below 5, and below 3.5 is excellent. Non-HDL cholesterol (total minus HDL) is the other modern favourite: it sums up all the cholesterol carried by artery-clogging particles in a single number, doesn't require fasting, and is a useful target especially when triglycerides are raised.
How LDL is estimated
Many labs don't measure LDL directly; they calculate it with the Friedewald equation, and so does this tool when you leave the LDL field blank: LDL = Total − HDL − (Triglycerides ÷ 5) in mg/dL, or divided by 2.2 in mmol/L. It is reliable for most people, but it breaks down when triglycerides are high (above about 400 mg/dL or 4.5 mmol/L) or when LDL is very low — situations where a directly measured LDL is more accurate. If your triglycerides are high, the tool will tell you it cannot reliably estimate LDL and suggest a direct measurement.
Reference ranges
The following general reference points (based on NCEP ATP III and AHA guidance) are what the tool uses to label each value. They are population reference ranges, not personal targets.
| Measure | Desirable | Borderline | Concerning |
|---|---|---|---|
| Total cholesterol | <200 mg/dL | 200–239 | ≥240 |
| LDL | <100 mg/dL | 130–159 | ≥160 |
| HDL | ≥60 mg/dL | 40–59 (M) / 50–59 (F) | <40 (M) / <50 (F) |
| Triglycerides | <150 mg/dL | 150–199 | ≥200 |
| Non-HDL | <130 mg/dL | 130–189 | ≥190 |
| Total/HDL ratio | <3.5 | 3.5–5 | >5 |
Why your doctor's target may be stricter
Cholesterol goals are not one-size-fits-all — they are set according to your overall cardiovascular risk. Someone who has already had a heart attack, or who has diabetes, is given a much lower LDL target than a healthy low-risk young adult, because the benefit of driving LDL down rises with baseline risk. That is also why cholesterol should never be judged alone: clinicians weigh it alongside blood pressure, smoking, diabetes, age, sex and family history (and tools such as risk calculators) to decide what your numbers mean and whether treatment is worthwhile. This calculator gives you the reference context; your doctor sets your personal target.
Improving your numbers
Diet and lifestyle can shift lipids meaningfully. To lower LDL: replace saturated and trans fats (fatty meat, butter, palm and coconut oil, processed snacks) with unsaturated fats (olive and rapeseed oil, nuts, seeds, oily fish), and eat more soluble fibre (oats, beans, lentils, fruit) and foods with plant sterols. To raise HDL: exercise regularly, stop smoking, and favour unsaturated fats. To lower triglycerides: cut sugar, refined carbohydrate and alcohol, lose excess weight, and increase omega-3 intake. Recheck after about three months of genuine change; if LDL remains high despite effort, your doctor may discuss medication — most commonly a statin — based on your overall risk.
Limitations
This tool interprets the numbers you enter against standard reference ranges and estimates LDL when needed; it is educational and cannot replace a clinician's interpretation of your full lipid panel in the context of your personal risk. The Friedewald LDL estimate is unreliable with high triglycerides, and none of these numbers should prompt you to start or stop medication on your own. Use the result to understand your panel and to have a more informed discussion with a healthcare professional.