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Cholesterol Ratio Calculator

Calculate your total cholesterol to HDL ratio and Non-HDL cholesterol, with risk bands consistent with AHA and NCEP ATP III guidance.

TC/HDL Ratio = Total Cholesterol ÷ HDL. Risk bands consistent with AHA and NCEP ATP III guidance: under 3.5 is low risk, 3.5-5.0 is moderate risk, above 5.0 is higher risk. Total cholesterol 200 mg/dL with HDL 50 mg/dL gives a ratio of 4.0. This is a screening ratio, not a diagnosis.

Formula Verified by Dr. Sarah Jenkins, PhD

Quick actions: Save inputs, view saved runs, print, share, or export results

Saved Runs

Inputs

Total cholesterol (mg/dL)

HDL cholesterol (mg/dL)

LDL cholesterol (mg/dL, optional)

Results

TC/HDL Ratio

4.0

Risk BandModerate risk

Non-HDL Cholesterol150 mg/dL

Tip

Save this page to recheck your ratio after each new lipid panel and track the trend over time, alongside your doctor's interpretation.

Formula

Cholesterol ratio formulas

TC/HDL Ratio = Total Cholesterol ÷ HDL. Non-HDL = Total Cholesterol − HDL. LDL/HDL Ratio = LDL ÷ HDL.

Risk bands consistent with guidance referenced by the AHA and the NCEP ATP III framework: under 3.5 low risk, 3.5-5.0 moderate risk, above 5.0 higher risk.

Step by step

How the calculation works

1Enter your Total Cholesterol and HDL from the same lipid panel.
2Optionally enter LDL to also see the LDL/HDL ratio and confirm your Non-HDL figure.
3Review your ratio against the risk bands, and check Non-HDL cholesterol alongside it.
4Discuss the full panel with a clinician — this ratio is a screening signal, not a diagnosis.

Example

Worked example: a ratio in the low-risk band

Total cholesterol 180 mg/dL, HDL 60 mg/dL: TC/HDL = 180 ÷ 60 = 3.0, under the 3.5 threshold. Non-HDL cholesterol is 180 − 60 = 120 mg/dL.

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Cholesterol Ratio Calculator

Calculate your total cholesterol to HDL ratio and Non-HDL cholesterol, with risk bands consistent with AHA and NCEP ATP III guidance.

Formula Verified by Dr. Sarah Jenkins, PhD

How to understand and use this calculator

What the ratio adds beyond a single cholesterol number

Total Cholesterol to HDL ratio (TC/HDL) is calculated by dividing total cholesterol by HDL ('good') cholesterol, using two numbers from the same lipid panel. A single total cholesterol number in isolation doesn't distinguish someone with high HDL (generally protective) from someone with the same total driven by high LDL ('bad' cholesterol) — the ratio captures some of that balance in one number. Consistent with guidance referenced by the American Heart Association and the earlier NCEP ATP III framework, commonly used bands are: below 3.5 considered low risk, 3.5 to 5.0 considered moderate/average risk, and above 5.0 considered higher risk.

Non-HDL cholesterol: what current guidance actually emphasizes more

Beyond the classic ratio, current ACC/AHA cholesterol guidance identifies Non-HDL cholesterol (Total Cholesterol minus HDL) as a primary treatment target, because it captures all the 'bad' cholesterol-carrying particles (LDL plus other atherogenic particles like VLDL) in one number and has been shown to predict cardiovascular events better than LDL alone. This calculator shows Non-HDL alongside the traditional ratio specifically because many older cholesterol-ratio tools only show the ratio and miss this more current emphasis.

Why this is a screening ratio, not a diagnosis

A cholesterol ratio can flag a pattern worth discussing, but it does not diagnose heart disease and shouldn't be read as a standalone verdict on cardiovascular risk. Clinicians interpret lipid numbers together with LDL, triglycerides, blood pressure, age, diabetes status, smoking history, and family history — a full risk assessment tool like the Cardiac Risk (Framingham) Calculator incorporates several of those factors together, which a ratio alone cannot. A full lipid panel read by a clinician, not a ratio calculator, is what actually determines whether treatment is warranted.

Worked example: a ratio in the low-risk band

Total cholesterol 180 mg/dL, HDL 60 mg/dL: TC/HDL = 180 ÷ 60 = 3.0 — under the 3.5 threshold, in the commonly cited lower-risk band. Non-HDL cholesterol here is 180 − 60 = 120 mg/dL.

Worked example: a ratio in the higher-risk band

Total cholesterol 240 mg/dL, HDL 40 mg/dL: TC/HDL = 240 ÷ 40 = 6.0 — above the 5.0 threshold, in the commonly cited higher-risk band, driven here by both an elevated total cholesterol and a low HDL. Non-HDL cholesterol here is 240 − 40 = 200 mg/dL, itself an elevated Non-HDL reading worth discussing with a clinician alongside the ratio.

Related concepts

TC/HDL ratio

Total cholesterol divided by HDL cholesterol, a screening ratio for cardiovascular risk referenced in AHA and NCEP ATP III guidance.

Non-HDL cholesterol

Total cholesterol minus HDL, capturing all atherogenic cholesterol particles; identified by current ACC/AHA guidance as a primary treatment target.

HDL and LDL cholesterol

HDL ('good') cholesterol helps clear cholesterol from the bloodstream; LDL ('bad') cholesterol contributes to arterial plaque buildup.

Frequently Asked Questions

What is the cholesterol ratio formula?+

TC/HDL Ratio = Total Cholesterol ÷ HDL Cholesterol, using two values from the same lipid panel, in the same units (the ratio itself is unitless as long as both are measured consistently).

What is a good cholesterol ratio?+

Guidance consistent with the American Heart Association and the NCEP ATP III framework commonly cites under 3.5 as low risk, 3.5-5.0 as moderate risk, and above 5.0 as higher risk — though a clinician interprets this alongside your full lipid panel, not in isolation.

What is Non-HDL cholesterol and why does it matter?+

Non-HDL cholesterol is Total Cholesterol minus HDL, capturing all atherogenic ('bad') cholesterol-carrying particles including LDL and VLDL in one number. Current ACC/AHA guidance identifies it as a primary treatment target because it predicts cardiovascular events better than LDL alone.

Is a low cholesterol ratio always healthy?+

A low ratio is a favorable signal, but it doesn't rule out other risk factors like high triglycerides, high blood pressure, or family history — a ratio is one piece of a larger risk picture, not a complete assessment on its own.

Does this calculator diagnose heart disease risk?+

No. It calculates a screening ratio from numbers you provide. Diagnosis and risk assessment require a clinician reviewing your full lipid panel alongside your broader health history.

What's the difference between TC/HDL ratio and LDL/HDL ratio?+

TC/HDL uses total cholesterol (which includes LDL, HDL, and a portion of triglycerides); LDL/HDL isolates just the 'bad' and 'good' cholesterol components directly. Both are used in different clinical contexts, and neither replaces a full panel review.

How often should I check my cholesterol ratio?+

Follow your doctor's recommended lipid panel schedule, generally every 4-6 years for average-risk adults or more frequently if you have risk factors or are on treatment — this calculator is for reviewing a result you already have, not for determining testing frequency.

How the calculation works

1Enter your Total Cholesterol and HDL from the same lipid panel.

2Optionally enter LDL to also see the LDL/HDL ratio and confirm your Non-HDL figure.

3Review your ratio against the risk bands, and check Non-HDL cholesterol alongside it.

4Discuss the full panel with a clinician — this ratio is a screening signal, not a diagnosis.

How to understand and use this calculator

What the ratio adds beyond a single cholesterol number

Non-HDL cholesterol: what current guidance actually emphasizes more

Why this is a screening ratio, not a diagnosis

Worked example: a ratio in the low-risk band

Total cholesterol 180 mg/dL, HDL 60 mg/dL: TC/HDL = 180 ÷ 60 = 3.0 — under the 3.5 threshold, in the commonly cited lower-risk band. Non-HDL cholesterol here is 180 − 60 = 120 mg/dL.

Worked example: a ratio in the higher-risk band

Related concepts

TC/HDL ratio

Total cholesterol divided by HDL cholesterol, a screening ratio for cardiovascular risk referenced in AHA and NCEP ATP III guidance.

Non-HDL cholesterol

Total cholesterol minus HDL, capturing all atherogenic cholesterol particles; identified by current ACC/AHA guidance as a primary treatment target.

HDL and LDL cholesterol

HDL ('good') cholesterol helps clear cholesterol from the bloodstream; LDL ('bad') cholesterol contributes to arterial plaque buildup.

Frequently Asked Questions

What is the cholesterol ratio formula?+

TC/HDL Ratio = Total Cholesterol ÷ HDL Cholesterol, using two values from the same lipid panel, in the same units (the ratio itself is unitless as long as both are measured consistently).

What is a good cholesterol ratio?+

What is Non-HDL cholesterol and why does it matter?+

Is a low cholesterol ratio always healthy?+

Does this calculator diagnose heart disease risk?+

No. It calculates a screening ratio from numbers you provide. Diagnosis and risk assessment require a clinician reviewing your full lipid panel alongside your broader health history.

What's the difference between TC/HDL ratio and LDL/HDL ratio?+

How often should I check my cholesterol ratio?+

Cholesterol Ratio Calculator

Inputs

Results

Cholesterol ratio formulas

How the calculation works

Worked example: a ratio in the low-risk band

Learn more about this calculation

How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide

Understanding Calculator Formulas: How DTC Turns Inputs into Results

Cholesterol Ratio Calculator

Inputs

Results

Key output metrics

How to understand and use this calculator

What the ratio adds beyond a single cholesterol number

Non-HDL cholesterol: what current guidance actually emphasizes more

Why this is a screening ratio, not a diagnosis

Worked example: a ratio in the low-risk band

Worked example: a ratio in the higher-risk band

Related concepts

Frequently Asked Questions

Cholesterol ratio formulas

How the calculation works

Worked example: a ratio in the low-risk band

Learn more about this calculation

How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide

Understanding Calculator Formulas: How DTC Turns Inputs into Results

Key output metrics

How to understand and use this calculator

What the ratio adds beyond a single cholesterol number

Non-HDL cholesterol: what current guidance actually emphasizes more

Why this is a screening ratio, not a diagnosis

Worked example: a ratio in the low-risk band

Worked example: a ratio in the higher-risk band

Related concepts

Frequently Asked Questions