Free Medical Unit Conversion Calculators with Easy-to-Follow Formulas

Quickly convert lab values and medical measurements across common healthcare units, with clear formulas for hormones, blood tests, electrolytes, metabolic markers, therapeutic drugs, and specialty chemistry panels.

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Core Conversions

General lab unit conversions, including concentrations, electrolytes, enzyme activity, and molecular-weight based unit changes.

View category 23 tools Hormones

Thyroid, sex hormones, pituitary, adrenal, pregnancy, fertility, and hormone ratio calculators.

View category 16 tools Metabolic

Lipid panel, glucose, diabetes, cardiac biomarkers, inflammation, coagulation, and metabolic risk tools.

View category 16 tools Blood & Heart

CBC, iron studies, blood gas, hemoglobin variants, cardiac labs, and hematology conversions.

View category 9 tools Drugs & Toxicology

Therapeutic drug monitoring, antibiotics, anticonvulsants, toxicology, and medication-related lab conversions.

View category 8 tools Specialty & Critical Care

Pediatric, neonatal, ICU, neurology, oncology, autoimmune, and specialty lab calculators.

View category 12 tools

Blood Glucose Conversion Calculator Convert blood glucose between mg/dL and mmol/L with the 18 factor, plus fasting, OGTT and diabetes reference ranges. Cholesterol Conversion Calculator Convert total, LDL, HDL cholesterol and triglycerides between mmol/L and mg/dL, with reference ranges. LDL Cholesterol Calculator Estimate LDL with the Friedewald equation and convert LDL between mmol/L and mg/dL, with reference ranges. Triglycerides Conversion Calculator Convert triglycerides between mmol/L and mg/dL with the 88.57 factor, reference ranges, and pancreatitis-risk guidance. HDL Cholesterol Conversion Calculator Convert HDL "good" cholesterol between mmol/L and mg/dL with the 38.67 factor and sex-specific protective ranges. HbA1c Conversion Calculator Convert HbA1c between percentage and mmol/mol, with estimated average glucose in mg/dL and mmol/L. eGFR Calculator (CKD-EPI 2021) Estimate GFR from creatinine, age and sex with the race-free CKD-EPI 2021 equation, and see the CKD stage. Urea / BUN Conversion Calculator Convert BUN (mg/dL) to urea (mmol/L) with the 0.357 factor and understand the BUN vs urea difference. Uric Acid Conversion Calculator Convert uric acid between mg/dL and µmol/L with the 59.48 factor, plus gout and hyperuricemia thresholds.

Transferrin Saturation (TSAT) Calculator Calculate transferrin saturation from serum iron and TIBC, with iron deficiency and overload ranges. Serum Iron Conversion Calculator Convert serum iron between µg/dL and µmol/L with the 0.179 factor, reference ranges, and a chart. TIBC Conversion Calculator Convert total iron-binding capacity between µg/dL and µmol/L, with reference ranges and what high vs low TIBC means. Ferritin Conversion Calculator Ferritin ng/mL = µg/L (1:1), plus pmol/L, reference ranges, and what low and high ferritin mean. Vitamin B12 Conversion Calculator Convert vitamin B12 (cobalamin) between pg/mL, ng/L and pmol/L with the 0.738 factor and deficiency ranges. Folate Conversion Calculator Convert folate (folic acid) between ng/mL and nmol/L with the 2.266 factor, reference ranges, and serum vs RBC folate. Homocysteine Conversion Calculator Convert homocysteine between µmol/L and mg/L with the 0.135 factor, risk tiers, and the B12/folate connection. Hemoglobin g/dL to mmol/L Calculator Convert hemoglobin between g/dL and mmol/L with monomer and tetramer basis options. ng/mL to µg/L Conversion Calculator Convert ferritin, PSA, and other mass concentration lab values with the direct 1:1 relationship.

µkat/L to U/L Conversion Calculator Convert enzyme activity units often seen in liver, metabolic, and specialty chemistry panels. U/L to µkat/L Conversion Calculator Convert enzyme activity values from U/L to SI-style microkatals per liter. U/L to IU/L Conversion Calculator Convert enzyme activity labels between U/L and IU/L for liver, pancreatic, and specialty chemistry results. Calcium Conversion Calculator Convert total or ionized calcium units for electrolyte, metabolic, and critical care review. Anion Gap Calculator Calculate anion gap and albumin-corrected anion gap for ICU, emergency, and acid-base review. Creatinine Clearance Calculator Estimate Cockcroft-Gault creatinine clearance for renal and medication dosing review. eGFR Calculator (CKD-EPI 2021) Estimate glomerular filtration rate and CKD stage with the race-free CKD-EPI 2021 equation. Caffeine Unit Converter Convert caffeine levels for neonatal, ICU, or toxicology lab review. Lidocaine Unit Converter Convert lidocaine levels for ICU, anesthesia, or toxicology lab review.

Accurate Lab Unit Conversions You Can Understand

Lab results are reported in different units around the world. Most of Europe, Canada, Australia and Asia use SI units such as mmol/L, µmol/L and nmol/L, while the United States mostly uses conventional units such as mg/dL, µg/dL and ng/mL.

ConvertMedUnits translates between the two clearly and correctly — and, just as importantly, explains what the numbers mean once they are converted. Whether you are checking a blood glucose, cholesterol, HbA1c, TSH or testosterone result, each tool does more than spit out a number.

The exact formula

See the calculation itself, not just the answer.

The conversion factor

The factor and molecular weight behind it, shown openly.

A chart both ways

Quick lookups in either direction, with common values.

Reference ranges

Normal, borderline and beyond, where ranges exist.

Clinical context

What the value actually means, in plain language.

Cited sources

Every page lists the references it relied on.

How We Derive Our Numbers

Most conversions between mass and molar units come directly from a substance's molecular weight, so each analyte has its own factor: glucose uses about 18, cholesterol about 38.67, and triglycerides about 88.57. We publish the factor and the molecular weight on every page so the maths is transparent, and we cross-check reference ranges against recognised guideline sources such as the American Diabetes Association, the National Kidney Foundation, the American College of Rheumatology and endocrinology references. You can read the full process on our methodology and editorial standards page.

Who This Is For

ConvertMedUnits is used by patients comparing results across countries, students and trainees learning laboratory medicine, and healthcare and laboratory staff who need a quick, reliable conversion with the reference context attached. Whoever you are, the same rule applies: this is educational information, not medical advice. Always compare your results against your own laboratory's reference range and discuss them with a qualified healthcare professional. See our medical disclaimer for details.

A good place to start is the SI unit conversion calculator, which converts 29 common analytes and links through to a dedicated tool for each one.

Frequently Asked Questions

Common questions about converting and understanding lab values.

How do I convert my lab result to different units?

Pick the calculator for your test, enter the value, and choose the direction (for example mg/dL to mmol/L). Each tool shows the converted result, the exact formula, and the conversion factor so you can see how the answer was reached.

Why do different countries use different lab units?

Most of the world reports lab results in SI (molar) units such as mmol/L, µmol/L and nmol/L, while the United States mainly uses conventional (mass) units such as mg/dL, µg/dL and ng/mL. Both describe the same result; a conversion factor, based on the substance's molecular weight, translates between them.

Are the reference ranges here the same as my own lab's?

Not necessarily. We show commonly cited ranges for context, but reference ranges vary by laboratory, assay, age, sex and population. Always compare your result against the reference interval printed on your own lab report.

How accurate are the conversions?

Conversion factors are derived from published molecular weights and cross-checked against clinical-chemistry references and guideline bodies. Each page lists its sources, and our full process is described on the methodology page.

Is ConvertMedUnits medical advice?

No. This site provides educational information to help you convert and understand lab values. It is not medical advice, diagnosis or treatment — always discuss your results with a qualified healthcare professional.