Lab Unit Converters

Convert clinical lab values between conventional (US) and SI units, using the exact published factor for each analyte. Free, instant, and private — everything runs in your browser.

These are unit-conversion reference tools, not diagnosis or medical advice. Reference intervals vary by laboratory, method and individual — read your result against the range on your own report and consult a healthcare professional.
Glucose mg/dL ⇄ mmol/L Blood glucose is reported in mg/dL in the United States and in mmol/L across most other countries. HbA1c % (DCCT) ⇄ mmol/mol (IFCC) HbA1c is reported as a percentage (NGSP/DCCT) in the US and in mmol/mol (IFCC) in much of the world. Estimated average glucose (eAG) in mg/dL ≈ 28.7 × A1c% − 46.7. Cholesterol mg/dL ⇄ mmol/L Total, LDL and HDL cholesterol are reported in mg/dL in the US and mmol/L elsewhere, all using the same molar-mass factor. Triglycerides mg/dL ⇄ mmol/L Triglycerides are reported in mg/dL in the US and mmol/L elsewhere. Creatinine mg/dL ⇄ µmol/L Serum creatinine is reported in mg/dL in the US and µmol/L elsewhere. Vitamin D ng/mL ⇄ nmol/L 25-hydroxyvitamin D is reported in ng/mL in the US and nmol/L elsewhere. Vitamin B12 pg/mL ⇄ pmol/L Vitamin B12 (cobalamin) is reported in pg/mL in the US and pmol/L elsewhere. Total T4 µg/dL ⇄ nmol/L Total T4 is reported in µg/dL in the US and nmol/L elsewhere. Free T4 ng/dL ⇄ pmol/L Free T4 (FT4) is reported in ng/dL in the US and pmol/L elsewhere. Total T3 ng/dL ⇄ nmol/L Total T3 is reported in ng/dL in the US and nmol/L elsewhere. Free T3 pg/mL ⇄ pmol/L Free T3 (FT3) is reported in pg/mL in the US and pmol/L elsewhere. Uric Acid mg/dL ⇄ µmol/L Uric acid is reported in mg/dL in the US and µmol/L elsewhere. Calcium mg/dL ⇄ mmol/L Serum calcium is reported in mg/dL in the US and mmol/L elsewhere. Bilirubin mg/dL ⇄ µmol/L Total bilirubin is reported in mg/dL in the US and µmol/L elsewhere. BUN / Urea mg/dL (BUN) ⇄ mmol/L (urea) The US reports blood urea nitrogen (BUN) in mg/dL, while most countries report urea in mmol/L. Testosterone ng/dL ⇄ nmol/L Total testosterone is reported in ng/dL in the US and nmol/L elsewhere. Insulin µIU/mL ⇄ pmol/L Insulin is reported in µIU/mL (identical to mIU/L) in the US and pmol/L elsewhere.

Frequently asked questions

What is a conventional-to-SI lab converter?

Clinical labs report the same result in different units depending on the country — the United States mostly uses "conventional" units (mg/dL, ng/mL, µg/dL), while most of the world uses SI units (mmol/L, nmol/L, pmol/L). These converters translate a value from one system to the other using the exact, published factor for each analyte, so the number matches what a lab abroad would report. Each analyte has its own factor: glucose and cholesterol are both reported in mg/dL, but they convert to mmol/L by different numbers because their molar masses differ.

Are these lab conversions accurate?

Yes — these lab conversions use the standard published factors. Each linear factor is derived from the analyte’s molar mass and matches the standard published conversion factor (for example glucose × 0.0555, cholesterol × 0.02586). HbA1c uses the official DCCT-to-IFCC formula. All math runs at full precision in your browser, and nothing is uploaded.

Can I use these to interpret my results?

These converters change units only — they do not interpret, diagnose or replace medical advice. A reference range is shown for context, but the interval printed on your own lab report is what applies to you. Always discuss results with a qualified healthcare professional.

Which lab values can I convert here?

The lab converters here cover Glucose, HbA1c, Cholesterol, Triglycerides, Creatinine, Vitamin D, Vitamin B12, Total T4, Free T4, Total T3, Free T3, Uric Acid, Calcium, Bilirubin, BUN / Urea, Testosterone, Insulin. Each has its own page with a two-way converter, a conversion table and a typical adult reference interval. Pick a card above to open the analyte you need.

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