Medical Laboratory Calculators – SI ↔ Conventional Units
Medical Laboratory Calculators
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About Our Medical Laboratory Calculators
These calculators convert **SI units** (the international standard) to the **conventional units** often found in lab reports and clinical guidelines (for example, mmol/L ↔ mg/dL or µmol/L ↔ mg/dL), so clinicians, students, and patients can compare values correctly across countries, instruments, and publications.
Why unit conversion matters
- Global consistency: Research papers and guidelines may use SI, while local labs may report conventional units.
- Clinical safety: Misreading units can change risk categories (e.g., lipids, glucose, creatinine).
- Comparability: Follow-up tests done at different labs or devices remain comparable after conversion.
- Education: Helps trainees learn typical reference ranges in both systems.
Where these conversions are used
- Clinics & hospitals: Converting lab results to match local protocols and drug-dosing references.
- Laboratories: Cross-checking instrument outputs, proficiency testing, and method verification.
- Academia & exams: Reading textbooks/papers that mix unit systems.
- Telemedicine & EHR: Normalizing values from different providers or countries.
Common unit pairs we support
Examples include mg/dL ↔ mmol/L, µmol/L ↔ mg/dL, ng/mL, µg/L, IU/L, U/L, and mEq/L (for electrolytes).
| Analyte | Conventional → SI (multiply by) | SI → Conventional (divide by) | Units |
|---|---|---|---|
| Glucose | 0.0555 | 0.0555 | mg/dL ↔ mmol/L |
| Cholesterol (total) | 0.0259 | 0.0259 | mg/dL ↔ mmol/L |
| Triglycerides | 0.0113 | 0.0113 | mg/dL ↔ mmol/L |
| Creatinine | 88.4 | 88.4 | mg/dL ↔ µmol/L |
| Bilirubin (total) | 17.10 | 17.10 | mg/dL ↔ µmol/L |
| BUN (Urea nitrogen) | 0.357 | 0.357 | mg/dL ↔ mmol/L |
| Calcium | 0.2495 | 0.2495 | mg/dL ↔ mmol/L |
| Phosphate (as P) | 0.3229 | 0.3229 | mg/dL ↔ mmol/L |
Note: These factors are shown for quick reference only. Each calculator uses the appropriate molar mass and displays the result with sensible precision for that analyte.
What our calculators do
- Convert results both ways (e.g., mg/dL → mmol/L and mmol/L → mg/dL).
- Show the exact conversion factor used and intermediate steps (when relevant).
- Keep everything client-side—calculations run in your browser.
Good practice when interpreting values
- Always compare with your lab’s reference range and clinical context.
- Units on reports can differ by analyzer; verify the unit before converting.
- Some tests (e.g., enzymes in U/L) may not convert to mass-based units.
Accuracy, rounding & significant figures
We use high-precision constants and round the display to typical clinical practice (for example, 1–2 decimals for most chemistries, whole numbers for counts). If you need different precision for audit or research, use the specific analyte calculator on this site.
Privacy & data handling
All calculations are performed locally in your browser. We do not store or transmit any entered values.
Disclaimer
These tools are for education and clinical reference only and do not replace professional medical judgment. Always consult a qualified healthcare professional and rely on the official laboratory report for diagnosis and treatment decisions.