Convert 5.5 mmol/L to mg/dL
5.5 × 18.02 = 99.11
Displayed result: 99 mg/dL
Blood sugar calculator
Blood glucose converter: mmol/L and mg/dL
Convert a blood glucose result between mmol/L, commonly used in the UK, and mg/dL, commonly used in the United States and some international reports.
Private by design
Calculations happen on this device. Nothing you enter is sent to or stored by Trupoint.
Enter a laboratory result
Not stored
Blood glucose converter
Educational conversion only. Laboratory ranges vary, and unexpected results should be discussed with a qualified clinician.
Three simple steps
How to use this calculator
Use the wording and unit from your original laboratory report. Keep that report available when reviewing the converted value.
-
1
Identify the glucose value
Use a result labelled blood glucose, plasma glucose or serum glucose and keep the report’s sample description for context.
-
2
Choose mmol/L or mg/dL
Select the unit shown beside the value. Do not infer the unit from the number alone.
-
3
Use the converted value with the original report
The output is the same concentration in another unit. Fasting status, sample timing and laboratory interpretation do not change.
How it works
About this calculation
The conversion changes only the unit used to express the same glucose concentration. It does not change the underlying laboratory result or account for whether the sample was fasting, random, capillary or venous.
Worked answers
Conversion examples and common values
These examples show the arithmetic and the rounding used by the calculator. They are not reference ranges or personal targets.
Convert 100 mg/dL to mmol/L
100 ÷ 18.02 = 5.55
Displayed result: 5.55 mmol/LConvert 7.0 mmol/L to mg/dL
7.0 × 18.02 = 126.14
Displayed result: 126 mg/dL| Glucose (mmol/L) | Glucose (mg/dL) |
|---|---|
| 3.0 | 54 |
| 4.0 | 72 |
| 5.0 | 90 |
| 5.5 | 99 |
| 7.0 | 126 |
| 10.0 | 180 |
| 15.0 | 270 |
Why blood glucose units differ between reports
Millimoles per litre describe the number of glucose molecules in a litre of blood. Milligrams per decilitre describe the mass of glucose in a smaller volume. The molecular mass of glucose links the two scales.
The conversion factor is the same for fasting and random glucose, but their clinical meaning is not interchangeable. Capillary meter, continuous-monitor, venous plasma and laboratory results may also differ because they use different samples and methods.
Important context
Limitations
This calculator converts units only. A glucose result must be interpreted using the sample type, timing, laboratory reference information and your clinical context. Do not use a converted value to change medication or treatment without professional advice.
Questions about this tool
Frequently asked questions
These answers explain the calculation and its limitations. They do not interpret an individual laboratory result.
What is 5.5 mmol/L in mg/dL?
Multiplying 5.5 by 18.02 gives approximately 99 mg/dL. Both values describe the same glucose concentration in different units.
What is 100 mg/dL in mmol/L?
Dividing 100 by 18.02 gives approximately 5.55 mmol/L. The calculator displays mmol/L to two decimal places.
Does fasting change the conversion formula?
No. The unit conversion is unchanged. Fasting status changes how a result may be interpreted, so retain the timing and preparation information from the original report.
Can I use this for a finger-prick glucose reading?
The mathematical unit conversion applies, but a finger-prick meter and a venous laboratory test use different sample methods. Do not assume converted results are directly interchangeable for clinical decisions.
Can I use the same converter for cholesterol?
No. Conversion factors depend on the substance’s molecular mass. Cholesterol and triglycerides require different factors from glucose.
More free tools