Cholesterol Units Converter
200 mg/dL cholesterol converts to 5.172 mmol/L, while 5.2 mmol/L converts to 201.08 mg/dL. This cholesterol units converter switches total, LDL, or HDL cholesterol between mg/dL and mmol/L using the cholesterol-specific factor of 38.67. Enter the number exactly as it appears on the lab report and choose the direction that matches its current unit. The conversion changes only the unit used to express the concentration. It does not change the sample, classify the result, calculate cardiovascular risk, or recommend treatment. Keep the lipid name with the converted number because total cholesterol, LDL cholesterol, and HDL cholesterol have different clinical roles even though they use the same conversion factor. Triglycerides require a different factor and are outside this tool's scope.
Quick answer
For total, LDL, and HDL cholesterol, 1 mmol/L equals 38.67 mg/dL.
Cholesterol uses the factor 38.67. Glucose does not. Blood glucose uses a different factor, 18.0182.
This tool converts units only. It does not estimate cardiovascular risk or tell you whether a cholesterol result is healthy for you.
What this tells you
- •For total, LDL, and HDL cholesterol, 1 mmol/L equals 38.67 mg/dL.
- •To convert cholesterol from mmol/L to mg/dL, multiply the value by 38.67.
- •To convert cholesterol from mg/dL to mmol/L, divide the value by 38.67.
- •The result preserves more precision than many lab reports, which may show one decimal place in mmol/L or whole numbers in mg/dL.
- •The same factor works for total, LDL, and HDL cholesterol because each value represents cholesterol concentration.
- •Triglycerides do not use 38.67 and should not be entered in this cholesterol converter.
- •Blood glucose uses 18.0182, so glucose and cholesterol conversion factors must not be exchanged.
- •A converted value still needs its original lipid label, test conditions, lab range, and clinical context.
How to Use
- 1Find the total cholesterol, LDL, or HDL line on the report and confirm whether its unit is mg/dL or mmol/L.
- 2Enter the nonnegative cholesterol value without adding the unit to the number field.
- 3Choose mmol/L to mg/dL if the starting value uses mmol/L. Choose mg/dL to mmol/L if the starting value uses mg/dL.
- 4Convert the value, then read the output unit beside the result before copying it into notes or comparing it with another source.
- 5Keep the converted result labeled as total, LDL, or HDL so it is not confused with another part of the lipid panel.
- 6Match the rounding used by the document you are comparing. The converter may show extra decimal places that a laboratory would omit.
- 7Do not enter triglycerides or glucose. Use a substance-specific converter because those measurements have different molecular weights and factors.
How It Works
Formula
Cholesterol mg/dL = cholesterol mmol/L × 38.67
Cholesterol mmol/L = cholesterol mg/dL ÷ 38.67The factor 38.67 relates molar concentration to mass concentration for cholesterol. To convert 5.2 mmol/L, multiply 5.2 by 38.67. The unrounded result is 201.084 mg/dL, and the display rounds it to 201.08 mg/dL. In the reverse direction, divide 200 mg/dL by 38.67. That produces 5.1719679338 mmol/L, displayed as 5.172 mmol/L. Multiplication and division are inverse operations, although a round trip can differ slightly after a displayed value is rounded. The formula applies to total, LDL, and HDL cholesterol values. It does not apply to triglycerides, glucose, or every other substance measured in the same units.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Convert 5.2 mmol/L total cholesterol to mg/dL
Multiply 5.2 by 38.67 to get 201.084 mg/dL, which rounds to 201.08 mg/dL.
Convert 200 mg/dL total cholesterol to mmol/L
Divide 200 by 38.67 to get 5.1719679338 mmol/L, which rounds to 5.172 mmol/L.
Convert 3 mmol/L LDL cholesterol to mg/dL
Multiply 3 by 38.67 to get exactly 116.01 mg/dL with this factor. The arithmetic changes the unit only. Interpreting an LDL result requires the person's health history, treatment goals, and clinician guidance.
Convert 130 mg/dL LDL cholesterol to mmol/L
Divide 130 by 38.67 to get 3.3617791569 mmol/L. The converter can display up to four decimal places in this direction, so the formatted result is 3.3618 mmol/L. A lab may report the same concentration with fewer decimals.
Convert 50 mg/dL HDL cholesterol to mmol/L
Divide 50 by 38.67 to get 1.2929919834 mmol/L, which displays as 1.293 mmol/L after trailing zeros are omitted. Keep the HDL label attached because the same numeric unit conversion does not make HDL interchangeable with LDL or total cholesterol.
Convert 1.4 mmol/L HDL cholesterol to mg/dL
Multiply 1.4 by 38.67 to get 54.138 mg/dL. The mg/dL display allows up to two decimal places, giving 54.14 mg/dL. If a report uses whole mg/dL values, it may show 54 instead.
Common Cholesterol Unit Conversions
Quick cholesterol lookups using the cholesterol factor of 38.67.
| mg/dL | mmol/L |
|---|---|
| 150 | 3.88 |
| 180 | 4.65 |
| 200 | 5.17 |
| 220 | 5.69 |
| 240 | 6.21 |
| 300 | 7.76 |
This table is for cholesterol only. Blood glucose uses a different factor, 18.0182.
Keep the measurement context
A lipid panel contains several named results. Total cholesterol, LDL, and HDL can all be converted with 38.67, but their names must stay attached because they are not interpreted in the same way. Copying only the number and unit can create confusion when several results appear together.
Rounding explains many small differences between a converted value and a printed report. A source may round mmol/L to one or two decimal places and mg/dL to a whole number. Convert from the original reported value when possible instead of repeatedly converting a rounded result back and forth.
Unit conversion cannot show whether a measurement is appropriate for one person. Clinical interpretation may consider the full lipid panel, age, medical history, current treatment, blood pressure, diabetes status, smoking, and other risk information. Use the output to compare units, not to make a diagnosis.
Common mistakes
- Using the glucose factor of 18.0182 for cholesterol when total, LDL, and HDL cholesterol require 38.67
- Entering triglycerides because they appear on the same lipid panel even though triglycerides use a different conversion factor
- Choosing the direction based on the unit you want to start with instead of the unit printed beside the original value
- Dropping the total, LDL, or HDL label after conversion and later confusing one result with another
- Rounding the input before converting, which can create a larger difference than rounding only the final output
- Assuming a small mismatch proves one source is wrong when the two sources may use different display precision
- Treating the converted number as a diagnosis, risk score, or medication instruction instead of the same concentration in another unit
Limitations
This tool performs arithmetic unit conversion for total, LDL, or HDL cholesterol only. It does not convert triglycerides, glucose, apolipoproteins, lipoprotein(a), or other laboratory measurements that may appear beside cholesterol. It does not verify that the entered value was copied correctly, identify the type of cholesterol, apply a laboratory's reference range, or account for fasting status and measurement method. The result does not estimate cardiovascular risk or determine whether a value is desirable for a particular person. Display rounding can cause small differences when a converted result is compared with a report or converted back to its starting unit. Lab methods and reported precision may also differ.
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