Cholesterol Ratio Calculator — Total/HDL, LDL/HDL, TG/HDL

What this Cholesterol Ratio Calculator does

Most lab printouts hand you raw numbers — Total cholesterol, HDL, LDL, Triglycerides — without telling you how those numbers relate to each other. Ratios are where the clinical signal lives. This English-language calculator takes your four standard lipid panel values and computes three widely cited cardiovascular ratios (Total/HDL, LDL/HDL, and Triglyceride/HDL) alongside non-HDL cholesterol, then classifies each against American Heart Association reference bands: Optimal, Borderline, or Elevated. The Triglyceride/HDL ratio deserves particular attention — it has become a common proxy for insulin resistance and metabolic syndrome, yet most online tools skip it entirely. Both mg/dL (standard in the U.S.) and mmol/L (used in most other countries) are supported; unit conversion happens internally so your band thresholds stay accurate. 100% client-side — your data never leaves your browser. No uploads, no tracking, no server logs.

Features

Three ratios in one pass. Calculate Total/HDL, LDL/HDL, and Triglyceride/HDL simultaneously from a single lipid panel entry — no switching between tools.
Non-HDL cholesterol. Non-HDL (Total minus HDL) captures all atherogenic particles, including VLDL, making it a stronger predictor than LDL alone in people with elevated triglycerides.
AHA-referenced band classification. Each result is instantly labeled Optimal, Borderline, or Elevated based on thresholds drawn from the 2018 AHA/ACC cholesterol management guidelines.
mg/dL and mmol/L support. Toggle between U.S. and international units at any time. The calculator converts internally (cholesterol ×38.67, triglycerides ×88.57) so band thresholds stay correct in both systems.
ASCVD context and YMYL disclaimer. Inline notes explain that ratios complement but do not replace a full 10-year ASCVD risk score, and flag Lp(a) and apoB as markers that ratios cannot capture.
Fully private, zero server calls. All arithmetic runs in your browser with no network requests. Nothing is stored, logged, or transmitted — relevant if you are entering a patient's or your own lab values.

How to use the Cholesterol Ratio Calculator

Enter your four lab values, pick your units, and read your ratio bands instantly. No form submission, no sign-up required.

Select your units. Choose mg/dL if your lab report is from a U.S. provider, or mmol/L if it follows international format. You can switch at any time — values are recalculated on the fly.
Enter your lipid panel values. Type in Total cholesterol, HDL ('good'), LDL ('bad'), and Triglycerides exactly as they appear on your lab report. If LDL was calculated by the Friedewald equation (common when triglycerides ≤ 400 mg/dL), use that value — if triglycerides exceed 400 mg/dL, ask your lab for a direct LDL measurement.
Read your three ratios and non-HDL. Results update immediately. Each ratio shows the numeric value plus a color-coded band (Optimal / Borderline / Elevated) so you can figure your cholesterol ratio at a glance.
Check the thresholds panel. Expand the thresholds section to see the exact cutoff values for each ratio. For Triglyceride/HDL, note that the numeric thresholds differ between mg/dL and mmol/L — the tool handles this conversion automatically.
Bring results to your provider. Use the output as a conversation starter at your next primary-care visit. A borderline or elevated ratio is a prompt to ask about a full 10-year ASCVD risk calculation, not a standalone diagnosis.

Common use cases

Pre-appointment lab review. Got your results from a New York or San Francisco lab and want to understand them before your doctor's visit? Determine your cholesterol ratio here and arrive with specific questions instead of just raw numbers.
Tracking lifestyle or medication response. If you have started a statin, fibrate, or dietary intervention, re-enter your lipid panel every few months to track whether your Total/HDL and TG/HDL ratios are trending toward Optimal. Pair this with your [BMI calculator](/en/bmi-calculator/) results for a broader metabolic picture.
Metabolic syndrome screening. A Triglyceride/HDL ratio ≥ 4 (mg/dL) is a widely cited flag for insulin resistance. If yours falls in the Elevated band, it is worth discussing metabolic syndrome criteria — waist circumference, fasting glucose, blood pressure — with your clinician.
Understanding non-HDL cholesterol. Patients whose LDL was calculated (not directly measured) and who have elevated triglycerides often get a more reliable atherogenic-particle estimate from non-HDL. This tool shows both values side by side so you can ask your provider which number they are using to guide treatment.
Patient education and health literacy. Nurses, dietitians, and health educators can use the tool to walk clients through what HDL as a denominator actually means — why a total cholesterol of 220 mg/dL means something very different with an HDL of 70 vs. an HDL of 35.

Frequently asked questions

How do I find my cholesterol ratio from a standard lab report?

Your lab report lists Total cholesterol, HDL, LDL, and Triglycerides as separate line items. To calculate the HDL cholesterol ratio, divide Total by HDL — or just enter all four values here and the tool does it instantly. Most labs do not print ratios by default, which is why a dedicated calculator is useful.

What is a good Total/HDL ratio?

Below 3.5 is considered Optimal per AHA cardiovascular risk literature. Between 3.5 and 5 is Borderline, and 5 or above is Elevated. That said, a 'good' Total/HDL ratio does not guarantee that absolute LDL is in range — an LDL of 190 mg/dL is clinically significant regardless of what your ratio looks like. Always review absolute values alongside ratios.

Why does the Triglyceride/HDL ratio matter?

The TG/HDL ratio has emerged as a useful metabolic proxy. A value ≥ 4 in mg/dL is associated with insulin resistance and elevated small dense LDL particles — a phenotype not always visible in standard LDL numbers. Note that triglycerides are only reliable from a 9–12 hour fasting sample; a non-fasting draw can inflate the ratio significantly.

Is my data private? Does anything get sent to a server?

Nothing leaves your device. The entire calculation runs in your browser with plain JavaScript arithmetic. There are no API calls, no cookies tied to your inputs, and no server logs. The IRS uses BMI bracket tables only as a flag for further screening — similarly, this tool flags ratios for your awareness, not for any reporting system.

Why does my LDL value sometimes say 'calculated'?

Most labs derive LDL using the Friedewald equation: LDL = Total − HDL − (Triglycerides ÷ 5) in mg/dL. This is accurate when triglycerides are below 400 mg/dL, but the formula breaks down above that threshold. If your triglycerides are high, ask your lab for a direct LDL measurement. You can learn more about lipid measurement standards in the NHLBI blood cholesterol resource.

Do lipid ratios replace the 10-year ASCVD risk score?

No. Ratios are a fast sanity check — useful for figuring your cholesterol ratio trend over time or preparing questions for your doctor. The clinical gold standard is the Pooled Cohort Equations ASCVD score, which incorporates age, sex, race, blood pressure, diabetes, and smoking status alongside lipids. Lp(a) and apoB are additional markers that ratios cannot capture. If you want a full health picture, the [Body Fat Percentage Calculator](/en/body-fat-percentage-calculator/) can complement your metabolic assessment, but nothing replaces a clinician-run ASCVD calculation for cardiovascular decision-making.