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Cholesterol Ratio Calculator

Health

Calculate your total cholesterol-to-HDL ratio, LDL/HDL ratio, and non-HDL cholesterol from a standard lipid panel, with AHA-based cardiovascular risk context.

Total Cholesterol
mg/dL
100400
HDL Cholesterol
mg/dL
20100
LDL Cholesterol
mg/dL
50300
Triglycerides
mg/dL
50500

Total Cholesterol / HDL

0.0: 1

Risk Category (AHA)

—

LDL/HDL

0.0

TG/HDL

0.0

Non-HDL

0

For informational purposes only. Cholesterol ratios are one part of overall cardiovascular risk — discuss your lipid panel with a healthcare provider.

What is a Cholesterol Ratio?

A Cholesterol Ratio Calculator converts a standard lipid panel into several ratios that some clinicians use as supplementary cardiovascular risk indicators, most notably the total cholesterol to HDL ratio. Dividing total cholesterol by HDL ("good") cholesterol captures the balance between total cholesterol and the protective HDL fraction in a single number, which the American Heart Association frames with general reference thresholds for optimal, desirable, and elevated-risk ranges.

This calculator also computes the LDL to HDL ratio, non-HDL cholesterol, and the triglyceride to HDL ratio from the same panel, giving a fuller picture than any single value alone. It works well alongside body composition tools like the BMI Calculator and the Waist-to-Hip Ratio Calculator for a broader view of cardiovascular risk factors.

How to use this Cholesterol Ratio calculator

  1. Enter your Total Cholesterol value in mg/dL from a recent lipid panel.
  2. Enter your HDL Cholesterol value in mg/dL.
  3. Enter your LDL Cholesterol value in mg/dL.
  4. Enter your Triglycerides value in mg/dL.
  5. Review the Total Cholesterol / HDL Ratio result and its Risk Category, along with the LDL/HDL Ratio, Non-HDL Cholesterol, and Triglyceride/HDL Ratio, and discuss the full picture with a healthcare provider.

Formula & Methodology

Total Cholesterol / HDL Ratio = Total Cholesterol ÷ HDL Cholesterol

LDL / HDL Ratio = LDL Cholesterol ÷ HDL Cholesterol

Non-HDL Cholesterol = Total Cholesterol − HDL Cholesterol

Triglyceride / HDL Ratio = Triglycerides ÷ HDL Cholesterol

Risk categories for the total/HDL ratio follow American Heart Association reference framing: below 3.5 is optimal, below 5.0 is desirable, and 5.0 or above indicates elevated risk.

Worked example: total cholesterol 200 mg/dL, HDL 50 mg/dL, LDL 120 mg/dL, triglycerides 150 mg/dL:
- Total/HDL ratio = 200 ÷ 50 = 4.0 (Desirable range)
- LDL/HDL ratio = 120 ÷ 50 = 2.4
- Non-HDL cholesterol = 200 − 50 = 150 mg/dL
- Triglyceride/HDL ratio = 150 ÷ 50 = 3.0

For a fuller definition, see our glossary entry on Cholesterol Ratio.

Frequently Asked Questions

A cholesterol ratio, most commonly the total cholesterol to HDL ratio, is calculated by dividing total cholesterol by HDL ("good") cholesterol, producing a single number that some clinicians use as a quick cardiovascular risk indicator. It captures the balance between total cholesterol and protective HDL rather than looking at either value in isolation.
According to American Heart Association reference framing, a ratio below 3.5 is generally considered optimal, below 5.0 is considered desirable, and 5.0 or above is associated with elevated cardiovascular risk. Lower ratios generally reflect a more favorable balance between total and HDL cholesterol.
The LDL to HDL ratio divides LDL ("bad") cholesterol by HDL cholesterol, offering another way to look at the balance between harmful and protective cholesterol fractions. It's calculated alongside the total/HDL ratio in this calculator to give a fuller picture from the same lipid panel.
Non-HDL cholesterol is calculated as total cholesterol minus HDL cholesterol, capturing all the cholesterol carried in potentially atherogenic particles, including LDL and VLDL. Many guidelines consider non-HDL cholesterol a useful risk marker, sometimes even more predictive than LDL alone, particularly when triglycerides are elevated.
The triglyceride to HDL ratio is sometimes used as an indirect marker of insulin resistance and small, dense LDL particles, with higher ratios generally associated with greater metabolic risk. It's a supplementary marker alongside the primary cholesterol ratios rather than a standalone diagnostic value.
Ratios provide useful additional context but don't replace looking at individual values like total cholesterol, LDL, HDL, and triglycerides on their own, since a ratio can look acceptable even when individual numbers are outside desirable ranges. Most healthcare providers consider the full lipid panel together rather than relying on any single ratio.
General screening guidelines often recommend a lipid panel every four to six years for average-risk adults, with more frequent testing for those with risk factors, existing heart disease, or a family history of high cholesterol. Your healthcare provider can recommend the right testing frequency for your individual risk profile.
No — this calculator only processes the lipid values you enter and does not account for other important risk factors such as blood pressure, smoking status, diabetes, family history, or age. Tools like the [Diabetes Risk Calculator](/diabetes-risk-calculator/) address a different piece of overall cardiovascular and metabolic risk.
Excess body weight, particularly abdominal fat, is commonly associated with lower HDL and higher triglycerides, both of which can worsen cholesterol ratios — tools like the [BMI Calculator](/bmi-calculator/) and [Waist-to-Hip Ratio Calculator](/waist-hip-ratio-calculator/) provide related body composition context. Weight management is one of several lifestyle factors that can influence lipid panel results over time.
Diet, regular physical activity, weight management, and avoiding tobacco are commonly associated with improved cholesterol ratios in research, though genetics also play a significant role for many people. Any specific lifestyle or treatment plan for managing cholesterol should be developed with a healthcare provider based on your full lipid panel and overall risk profile.
Also known as
TC/HDL ratio calculatorcholesterol ratioLDL HDL ratio calculatornon-HDL cholesterol calculatorlipid panel ratio calculator