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Blood Test Unit Converter

Convert common laboratory blood-test results between conventional mass units (such as mg/dL) and SI molar units (such as mmol/L). Different countries and labs report the same test in different units, so a glucose of 100 mg/dL and 5.55 mmol/L are the same value seen two ways. This tool covers glucose, total/HDL/LDL cholesterol, triglycerides, creatinine, urea and BUN, HbA1c and uric acid, showing the exact conversion equation for each. It performs unit conversion only — it does not interpret results, provide reference ranges, or give medical advice.

How to use this tool

  1. Choose the blood test from the list (grouped by category).
  2. Enter the value you have.
  3. Choose the direction — conventional to SI, or SI to conventional.
  4. Read the converted value and the exact equation used.
  5. Take any interpretation of the numbers to a qualified healthcare professional.

The formula

Laboratory results are reported in conventional mass units (e.g. mg/dL) or SI molar units (e.g. mmol/L). Converting a simple analyte multiplies by a factor derived from its molar mass; some tests use a defined equation instead.

SI (mmol/L) = conventional (mg/dL) × (10 ÷ molar_mass) HbA1c: IFCC (mmol/mol) = (NGSP % − 2.15) × 10.929
molar mass
Grams per mole of the analyte
factor
e.g. glucose 0.0555, creatinine 88.42

These are unit conversions only. They carry no reference ranges and are not a medical assessment; interpretation belongs to a qualified clinician.

Worked examples

Glucose

Given
100 mg/dL
Result
5.55 mmol/L

Glucose converts with the factor 0.0555 (10 ÷ 180.16 g/mol), so 100 × 0.0555 = 5.55 mmol/L.

Creatinine

Given
1.0 mg/dL
Result
88.4 µmol/L

Creatinine uses the factor 88.42, giving 88.4 µmol/L — note the SI unit here is micromoles.

HbA1c

Given
7% (NGSP)
Result
53 mmol/mol (IFCC)

HbA1c uses a defined equation: (7 − 2.15) × 10.929 ≈ 53 mmol/mol.

Frequently asked questions

Conventional units (like mg/dL) are mass-based and common in the United States; SI units (like mmol/L) are molar and used in most of the world. Both describe the same quantity — one counts by weight, the other by number of molecules — so the same sample yields different numbers in each system.

No. It converts units only and deliberately carries no reference ranges. Normal ranges vary by lab, method, age, sex and clinical context, and interpreting a value is a job for a qualified healthcare professional. Use this only to translate a number from one unit to another.

By the factor 0.0555, which is 10 divided by glucose’s molar mass of about 180.16 g/mol (the 10 accounts for the dL-to-L change). So mmol/L = mg/dL × 0.0555, and mg/dL = mmol/L ÷ 0.0555. 100 mg/dL equals 5.55 mmol/L.

HbA1c is reported either as a percentage (NGSP) or in mmol/mol (IFCC), and the two relate through a defined master equation rather than a molar mass: IFCC = (NGSP% − 2.15) × 10.929. This tool applies that equation, so 7% converts to about 53 mmol/mol.

BUN (blood urea nitrogen) measures only the nitrogen portion, while urea measures the whole molecule. They differ by a factor of about 2.14 (urea = BUN × 2.14). This tool lists them separately with their own conversion factors so you convert whichever your report uses.

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