Convert lab values between mmol/L and mg/dL for glucose, cholesterol, creatinine, calcium, and 14 common analytes with reference ranges and batch mode.
Laboratory value reporting varies by country — the United States, Liberia, and Myanmar use conventional units (mg/dL, g/dL), while most of the world uses SI units (mmol/L, μmol/L, g/L). This creates confusion when interpreting international guidelines, reading foreign medical literature, or treating patients who present with lab results in unfamiliar units. A glucose of 7.0 mmol/L may not immediately register as diabetic-range to a US-trained physician, but converting to 126 mg/dL makes the significance clear.
This converter supports 14 commonly converted laboratory analytes including glucose, total cholesterol, LDL, HDL, triglycerides, creatinine, BUN, uric acid, calcium, magnesium, phosphorus, bilirubin, albumin, and hemoglobin A1c (NGSP ↔ IFCC). Each conversion includes clinical reference ranges, critical value alerts, and interpretation. The batch mode allows converting multiple values simultaneously — useful for reviewing a full metabolic panel or tracking trends over time.
Conversion factors are based on molecular weights and established international standards (IFCC for HbA1c). Reference ranges are for typical adults and may vary slightly between laboratories.
This tool eliminates the confusion of international unit differences for the 14 most commonly converted lab values. Whether you are reading European guidelines as a US physician, interpreting traveling patient records, or studying for international medical exams, instant bidirectional conversion with clinical interpretation ensures accurate value interpretation. Keep these notes focused on your operational context. Tie the context to the calculator’s intended domain.
mmol/L = mg/dL ÷ molecular weight factor. For glucose: mmol/L = mg/dL ÷ 18.016. For creatinine: μmol/L = mg/dL × 88.42. For HbA1c: IFCC (mmol/mol) = (NGSP% − 2.15) / 0.0915.
Result: 7.0 mmol/L — Above normal range (diagnostic threshold for diabetes)
Glucose 126 mg/dL ÷ 18.016 = 7.0 mmol/L. This is above the normal fasting range (70-100 mg/dL) and meets the diagnostic threshold for diabetes (fasting glucose ≥ 126 mg/dL or ≥ 7.0 mmol/L on two occasions).
The debate over SI units in clinical medicine has persisted for decades. Proponents argue that SI units (moles/liter) are scientifically superior because they reflect molecular quantities rather than mass, allowing direct comparison of equimolar concentrations. Critics point out that conventional units are deeply embedded in clinical decision-making — physicians instantly recognize that a glucose of 200 mg/dL is dangerous, while 11.1 mmol/L requires mental conversion for US-trained clinicians. The dual system creates ongoing patient safety concerns, particularly in emergency departments treating international patients.
The most dangerous conversion errors involve analytes where the factor is not intuitive. Creatinine is particularly treacherous: a creatinine of 2.0 mg/dL (moderately elevated in conventional units) converts to 176.8 μmol/L, not 2.0 mmol/L. Confusing μmol/L with mmol/L for creatinine would produce a 1000-fold error. Similarly, calcium in mmol/L (normal ~2.2-2.6) looks numerically similar to calcium in mg/dL (normal 8.5-10.5), creating potential for missed abnormalities if the unit is not clearly identified.
Since 2011, many international laboratories report HbA1c in both NGSP (%) and IFCC (mmol/mol) formats. The IFCC method is considered the more accurate reference method, but the NGSP percentage is more familiar to most clinicians. Key equivalencies: 6.0% = 42 mmol/mol, 6.5% = 48 mmol/mol (diabetes diagnostic threshold), 7.0% = 53 mmol/mol (typical treatment target), 8.0% = 64 mmol/mol, 9.0% = 75 mmol/mol.
The SI (Système International) system was adopted by most countries in the 1970s for laboratory reporting, expressing concentrations in moles per liter which reflects the number of molecules rather than mass. However, the US medical system largely retained conventional units (mg/dL) due to institutional inertia, the cost of converting all reference materials, and physician familiarity. This dual system persists today and requires conversion for international medical collaboration.
For a quick mental approximation: divide mg/dL by 18 to get mmol/L, or multiply mmol/L by 18 to get mg/dL. Key landmarks: 70 mg/dL ≈ 3.9 mmol/L (hypoglycemia threshold), 100 mg/dL ≈ 5.6 (upper normal), 126 mg/dL ≈ 7.0 (diabetes threshold), 200 mg/dL ≈ 11.1 (diabetes by random glucose).
Creatinine is expressed in mg/dL in conventional units but μmol/L (micromoles per liter, not mmol/L) in SI units because the normal values in mmol/L would be inconveniently small numbers. The conversion factor is 88.42: μmol/L = mg/dL × 88.42. A creatinine of 1.0 mg/dL = 88.4 μmol/L. Similarly, bilirubin uses μmol/L with factor 17.1.
HbA1c is reported as a percentage (NGSP/DCCT method) in the US — e.g., 7.0%. Most other countries report in mmol/mol (IFCC method) — e.g., 53 mmol/mol. The conversion is: IFCC = (NGSP − 2.15) / 0.0915. A value of 6.5% NGSP = 48 mmol/mol IFCC. Both measure the same glycated hemoglobin fraction but use different calibration standards.
Yes. Total cholesterol, LDL, and HDL all use the same conversion factor of 38.67 (the molecular weight factor for cholesterol). However, triglycerides use a different factor of 88.57 because triglycerides have a different molecular weight. This is a common source of conversion errors.
The conversion factors are universal — they are based on chemistry (molecular weights) and apply identically to all ages. However, normal reference ranges differ significantly for pediatric patients. For example, infant glucose ranges are lower, neonatal bilirubin interpretation requires age-specific nomograms, and pediatric creatinine ranges depend on age and muscle mass. Always use age-appropriate reference ranges for clinical interpretation.