LDL Cholesterol mmol/L To mg/dL Converter

Convert LDL cholesterol from mmol/L to mg/dL and back for reading UK and US-style laboratory reports, without interpreting whether a result is normal or deciding treatment.

Convert LDL Cholesterol Units

LDL Cholesterol Value

Enter the LDL cholesterol number exactly as shown on the report. Do not enter total cholesterol unless that is the value you mean to convert. Decimal Places

UK mmol/L reports often use one or two decimals. US mg/dL reports may use whole numbers. Optional Report Note

This note only appears in the result text. It does not change the conversion factor.

Converted LDL Result

116.0 mg/dL

3.00 mmol/L LDL cholesterol converts to 116.0 mg/dL using the cholesterol factor 38.67.

mmol/L value3.00 mmol/L

mg/dL value116.0 mg/dL

Conversion factor38.67 for cholesterol

ScopeUnit conversion only

This converter does not diagnose cardiovascular risk. Use your clinician or laboratory report for interpretation and targets.

LDL Cholesterol Formula

mg/dL = mmol/L x 38.67mmol/L = mg/dL / 38.67factor is specific to cholesterol because it depends on molecular weightdo not use this factor for triglycerides, glucose or other analytes

The conversion factor for cholesterol is about 38.67. It is specific to cholesterol units and should not be copied to triglycerides, glucose, creatinine or other blood tests. Different analytes have different molecular weights, so each needs its own factor. The calculator uses the same factor in both directions so a converted number can be checked in reverse.

LDL cholesterol may be measured directly or calculated from other lipid values, depending on the laboratory method and the sample. That method point can matter when results are close to a clinical decision boundary. The unit conversion does not change the underlying laboratory method, fasting status, sample quality, medication history or clinical risk assessment.

Quick LDL Conversion Table

LDL mmol/L	LDL mg/dL	Reverse Check	Use With Caution
1.0	38.7	38.7 mg/dL / 38.67 = 1.0 mmol/L	Conversion only, not a target statement.
1.8	69.6	69.6 mg/dL / 38.67 = 1.8 mmol/L	Often appears in treatment-target discussions, but targets are clinical.
2.6	100.5	100.5 mg/dL / 38.67 = 2.6 mmol/L	Common cross-border comparison point.
3.0	116.0	116.0 mg/dL / 38.67 = 3.0 mmol/L	Example UK report value.
4.0	154.7	154.7 mg/dL / 38.67 = 4.0 mmol/L	Discuss interpretation with a clinician.

How To Read A Converted LDL Number

Unit Difference

UK reports commonly use mmol/L. US websites and some studies often use mg/dL. The converter makes the number comparable in unit terms, but it does not align reference ranges or treatment rules.

Calculated Versus Direct LDL

Some reports calculate LDL from total cholesterol, HDL and triglycerides. Others measure it directly. If your report says calculated, keep that word with the converted number.

Risk Is Broader Than LDL Alone

Age, blood pressure, smoking, diabetes, family history, kidney disease and existing cardiovascular disease can affect risk. LDL is one part of a wider clinical picture.

Targets Are Personal

A target for one person may not apply to another. Do not use a converted value to start, stop or change medicine without clinical advice.

Worked Examples

A UK report lists LDL cholesterol as 3.0 mmol/L. Multiplying by 38.67 gives 116.01 mg/dL, normally written as 116.0 mg/dL or 116 mg/dL depending on the rounding style. If you copy the value into a US-style article or chart, keep the converted unit visible.

A US report lists LDL cholesterol as 100 mg/dL. Dividing by 38.67 gives 2.59 mmol/L. If a UK clinician wants the result in mmol/L, 2.6 mmol/L is a sensible rounded display, but the original report and laboratory method should stay in the record.

A person compares two results: 2.4 mmol/L from one UK lab and 95 mg/dL from another report. The 95 mg/dL value converts to 2.46 mmol/L, so the two numbers are close in unit terms. That does not prove there has been no clinical change, because sample timing, fasting status, lab method and treatment changes can all matter.

Medical Scope And Safety Notes

This page is a unit converter. It does not classify the result as good, bad, safe, dangerous, normal or abnormal. It does not diagnose familial hypercholesterolaemia, cardiovascular disease, metabolic disease or any other condition. It does not decide statin treatment, diet changes, referral, repeat testing or emergency care.

If your result is unexpected, very different from previous results, or shown with a laboratory flag, speak to a healthcare professional. If you have been given a personal target because of heart disease, stroke, diabetes, kidney disease or inherited lipid problems, use that target rather than a general internet table. Keep the original laboratory report because it contains units, sample date, method notes and reference comments that a copied number loses.

Report Details Worth Keeping

When you convert LDL units for a message, appointment or personal record, keep the sample date, laboratory name, fasting note if shown, medicine changes, and whether the value was direct or calculated. Two LDL numbers in different units may look comparable after conversion, but the clinical context can be different.

Do not strip out HDL, triglycerides, total cholesterol or non-HDL cholesterol if your clinician asked to see the full lipid profile. LDL is important, but many reports are interpreted as a set. The converted LDL value is helpful for reading an overseas article or chart, yet the original report remains the safest source record.

Why Unit Conversion Is Not Risk Scoring

A cardiovascular risk score normally uses several inputs, not LDL alone. Age, sex, smoking, blood pressure, diabetes, kidney disease, family history, previous cardiovascular disease and medicines can all matter. A converted LDL number may be one input, but it is not the risk score.

Laboratories may also flag results according to local reference intervals or clinical pathways. A US article may use mg/dL thresholds, while a UK clinic may discuss mmol/L and overall risk. Convert the unit if it helps communication, then let the relevant healthcare professional apply the clinical framework. Keep medication notes nearby.

FAQ

What is the LDL mmol/L to mg/dL formula?

Multiply mmol/L by 38.67 to convert LDL cholesterol to mg/dL.

How do I convert LDL mg/dL to mmol/L?

Divide mg/dL by 38.67.

Can I use this factor for triglycerides?

No. Triglycerides use a different conversion factor. This page is for cholesterol, including LDL cholesterol.

Does this tell me whether my LDL is healthy?

No. It changes units only. Your clinician or laboratory report should interpret the result in context.

Why do UK and US reports use different units?

Many UK laboratories report cholesterol in mmol/L, while US reports and articles often use mg/dL. Both can describe the same concentration in different units.

Should I round to whole mg/dL?

Whole mg/dL is common in some reports. Keep more decimals if you are checking arithmetic, then round for display.

Sources

NHS. (n.d.). High cholesterol. NHS. https://www.nhs.uk/conditions/high-cholesterol/
National Library of Medicine. (n.d.). Cholesterol levels: MedlinePlus medical test. MedlinePlus. https://medlineplus.gov/lab-tests/cholesterol-levels/
Joint Committee for Guides in Metrology. (2012). International vocabulary of metrology, 3rd edition. BIPM. https://www.bipm.org/en/committees/jc/jcgm/publications