Total Cholesterol Calculator

Updated Sep 4, 2026 By Jehan Wadia

Introduction

This Total Cholesterol Calculator adds up your blood fat numbers and tells you what they mean. Type in your LDL, HDL, and triglycerides, and it finds your total cholesterol. Or, if your lab report already shows a total, switch tabs and enter that instead.

Total cholesterol is the sum of three parts: LDL (the "bad" kind that clogs arteries), HDL (the "good" kind that clears it out), and VLDL (found by dividing triglycerides by 5). This is called the Friedewald equation, and doctors have used it for years.¹

The tool works in both mg/dL and mmol/L, so you can use whichever your lab uses. It also gives you extra numbers that matter for heart health: non-HDL cholesterol, your total-to-HDL ratio, LDL-to-HDL ratio, and triglyceride-to-HDL ratio. Each one gets a clear label like desirable, borderline, or high.

You will see a color gauge, charts that compare your numbers to target levels, a plain-language summary, and every step of the math. A reference table highlights the exact row your value lands in. HDL and ratio cut-offs change based on sex, since healthy ranges differ for men and women.

Use this to understand your lab results before or after you talk with your doctor. It is a learning tool, not a diagnosis.

How to use our Total Cholesterol Calculator

Enter your lipid panel numbers (LDL, HDL, and triglycerides) and the calculator gives you your total cholesterol, your VLDL and non-HDL cholesterol, your risk ratios, a step-by-step solution, and charts that show how your levels compare to healthy targets.

Pick a mode: Choose "Calculate Total (LDL + HDL + TG)" if you want the tool to add up your total cholesterol. Choose "Analyze Known Total" if your lab report already lists your total and you just want it explained.

Measurement Units: Tap mg/dL or mmol/L to match your lab report. Your numbers switch over right away, so nothing is lost.

Age: Type your age in years. This is optional and only adds context to the written summary.

Sex assigned at birth: Pick male, female, or prefer not to say. This sets the HDL and total-to-HDL ratio cut-offs, since healthy HDL levels differ between men and women.

LDL Cholesterol: Enter your LDL, the "bad" cholesterol that builds up in artery walls. In "Analyze Known Total" mode you can leave this blank, and the tool will work it out from your other numbers.

HDL Cholesterol: Enter your HDL, the "good" cholesterol that carries cholesterol back to your liver. Higher is better here.

Triglycerides: Enter your triglyceride level, the main fat in your blood. This is usually measured after fasting, and it is used to estimate your VLDL.

Total Cholesterol: In "Calculate Total" mode this box fills in on its own. In "Analyze Known Total" mode, type the total from your lab report.

Calculate and Reset: Results update as you type, but you can press Calculate any time. Press Reset to clear your entries and start over.

What Is Total Cholesterol?

Cholesterol is a waxy fat that moves through your blood. Your body needs some of it to build cells and make hormones. But too much of the wrong kind can stick to the walls of your arteries. Over time that buildup, called plaque, narrows the arteries and raises your risk of heart attack and stroke. To turn your lipid numbers into a 10-year risk estimate, use the ASCVD Risk Calculator.

Total cholesterol is the sum of all the cholesterol carried in your blood. It is made of three parts:

LDL cholesterol: the "bad" kind. It drops cholesterol off in your artery walls. Lower is better.
HDL cholesterol: the "good" kind. It picks up extra cholesterol and carries it back to the liver. Higher is better.
VLDL cholesterol: a fat-carrying particle. It is estimated by dividing your triglycerides by 5.

The Total Cholesterol Formula

Labs and doctors use the Friedewald equation:

Total Cholesterol = LDL + HDL + (Triglycerides ÷ 5)

This works when values are in mg/dL and triglycerides are under 400 mg/dL.¹ Above that number, the estimate is no longer trusted, and LDL should be measured directly in the lab.

Cholesterol Levels Chart

Test	Good Range	Watch Out
Total cholesterol	Under 200 mg/dL	240 mg/dL or more
LDL ("bad")	Under 100 mg/dL	160 mg/dL or more
HDL ("good")	60 mg/dL or more	Under 40 (men) or 50 (women)
Triglycerides	Under 150 mg/dL	200 mg/dL or more
Non-HDL	Under 130 mg/dL	190 mg/dL or more

Why One Number Is Not Enough

Total cholesterol alone can fool you. A person with a high HDL can have a high total and still be in good shape. Another person with a low HDL can have a normal total and still be at risk. That is why doctors also look at:

Non-HDL cholesterol (total minus HDL) counts every harmful particle in one number.
Total ÷ HDL ratio, often called the cardiac risk ratio. Under 3.5 is best.
LDL ÷ HDL ratio: compares the bad kind to the good kind.
Triglyceride ÷ HDL ratio: a clue for insulin resistance. McLaughlin and colleagues found the best cut-point for spotting insulin resistance in overweight adults was a ratio of 3.0 in traditional units, or 1.8 in SI units.³ This calculator flags ratios above 3.0.

Body measurements add more context too. Central body fat drives lipid problems, so measures like the Visceral Fat Calculator often move in the same direction as your triglycerides.

Units: mg/dL and mmol/L

The United States uses mg/dL. Canada, the UK, and most of Europe use mmol/L. To switch cholesterol values, multiply mg/dL by 0.02586. For triglycerides, multiply by 0.01129. So 200 mg/dL of total cholesterol equals about 5.17 mmol/L.

What Changes Your Numbers

Some things you can control, and some you cannot. Diet high in saturated fat, extra body weight, smoking, and little exercise push LDL and triglycerides up. Regular walking or other exercise raises HDL. Age, genes, thyroid problems, and some medicines also shift the numbers. A family condition called familial hypercholesterolemia can cause very high LDL even in young, healthy people.

Getting Tested

A lipid panel is a simple blood test. Many labs ask you to fast for 9 to 12 hours first, mostly so triglycerides read correctly.² Adults aged 20 to 65 should generally be checked every 5 years, and men aged 45 to 65 and women aged 55 to 65 every 1 to 2 years.² Check more often if levels are high or heart disease runs in the family.

This tool is for learning and general information. It does not replace advice from your doctor. Talk to a health care provider about your own results and treatment.

Formulas used

VLDL Cholesterol (estimated) ¹

\text{VLDL} = \frac{\text{TG}}{5}

Total Cholesterol (Friedewald) ¹

\text{TC} = \text{LDL} + \text{HDL} + \frac{\text{TG}}{5}

LDL Cholesterol back-calculated from known total ¹

\text{LDL} = \text{TC} - \text{HDL} - \frac{\text{TG}}{5}

Non-HDL Cholesterol ²

\text{Non-HDL} = \text{TC} - \text{HDL}

Cardiac risk ratio (Total / HDL), LDL/HDL and TG/HDL ratios

R_{\text{TC/HDL}} = \frac{\text{TC}}{\text{HDL}}, \quad R_{\text{LDL/HDL}} = \frac{\text{LDL}}{\text{HDL}}, \quad R_{\text{TG/HDL}} = \frac{\text{TG}}{\text{HDL}}

Unit conversion for cholesterol (mg/dL to mmol/L)

C_{\text{mmol/L}} = C_{\text{mg/dL}} \times 0.02586 \quad \Longleftrightarrow \quad C_{\text{mg/dL}} = \frac{C_{\text{mmol/L}}}{0.02586}

Unit conversion for triglycerides (mg/dL to mmol/L)

\text{TG}_{\text{mmol/L}} = \text{TG}_{\text{mg/dL}} \times 0.01129 \quad \Longleftrightarrow \quad \text{TG}_{\text{mg/dL}} = \frac{\text{TG}_{\text{mmol/L}}}{0.01129}

Gauge pointer position (percent of 100-320 mg/dL scale)

P = \frac{\text{TC} - 100}{320 - 100} \times 100\%, \quad 0 \le P \le 100

Frequently asked questions

What happens if my triglycerides are over 400 mg/dL?

The calculator shows a red warning. Above 400 mg/dL, the triglycerides ÷ 5 shortcut no longer works well, so any LDL that comes from it can be off.¹ Ask your lab for a direct LDL measurement instead of an estimate.

Does my age change the math?

No. Age is optional and does not change any number or category. It only appears in the written summary for context. Cholesterol targets are the same for most adults no matter their age.

Does switching between mg/dL and mmol/L change my result category?

No. The tool converts your values and the cut-off lines at the same time, so your category stays the same. Only the way the numbers look changes.

Why are the ratios shown on a mg/dL basis?

A ratio has no units, and the standard cut-offs used by doctors come from mg/dL data. The tool converts your values to mg/dL first, then divides. The ratio you get is the same either way.

My total cholesterol is under 200 but my LDL is high. Is that a problem?

It can be. A low HDL can pull your total down while your LDL stays harmful. Look at your LDL and non-HDL numbers and the risk ratios, not just the total. The calculator grades each one separately for this reason.

What does "borderline high" mean?

It means your number sits between the healthy range and the high range. MedlinePlus puts a healthy total cholesterol for adults aged 20 or older at less than 200 mg/dL.² This calculator labels 200 to 239 mg/dL borderline high. It is a warning sign, not a diagnosis. Diet, exercise, and weight changes often move borderline numbers back down.

Is the Friedewald estimate always accurate?

It works well for most people. It gets less accurate when triglycerides are high, when LDL is very low (under about 70 mg/dL), or if you did not fast. Newer methods like Martin-Hopkins and direct LDL tests handle those cases better.

How much can my cholesterol change between tests?

Small day-to-day swings are normal. Illness, stress, recent meals, pregnancy, and even the time of year can shift results. Doctors look at trends over several tests, not one reading.

How long does it take to lower cholesterol?

Diet and exercise changes usually take a couple of months to show up on a lipid panel, and medicines often work faster. Your doctor will pick when to retest.

Why is my triglyceride-to-HDL ratio over 3 a concern?

A high ratio often points to insulin resistance and small, dense LDL particles, which are more harmful. It can show up even when your total cholesterol looks fine. Bring it up with your doctor.

Should I fast before the blood test I enter here?

Follow your lab's instructions. Fasting mainly affects triglycerides, which then affects the VLDL estimate. If you ate before the draw, your triglycerides and total may read higher than usual.

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