Enter the concentration
Formula used
mg/dL = mmol/L × conversion factor mmol/L = mg/dL ÷ conversion factor Custom factor = molecular weight ÷ 10
Every analyte needs its own factor. A universal mmol/L multiplier would produce incorrect mass concentrations.
How to use this calculator
- Enter the laboratory concentration as a nonnegative number.
- Select the exact analyte shown on your laboratory report.
- Choose the required conversion direction and decimal precision.
- For a custom substance, enter its molecular weight in g/mol.
- Select Calculate, then review the factor and formula.
- Copy, print, or download the completed calculation when needed.
Common conversion factors
| Analyte | mmol/L to mg/dL | mg/dL to mmol/L |
|---|---|---|
| Glucose | Multiply by 18.0182 | Divide by 18.0182 |
| Total, LDL, or HDL cholesterol | Multiply by 38.67 | Divide by 38.67 |
| Triglycerides | Multiply by 88.57 | Divide by 88.57 |
| Calcium | Multiply by 4.0078 | Divide by 4.0078 |
| Urea | Multiply by 6.006 | Divide by 6.006 |
| Creatinine | Multiply by 11.312 | Divide by 11.312 |
| Lactate | Multiply by 9.008 | Divide by 9.008 |
| Magnesium | Multiply by 2.4305 | Divide by 2.4305 |
| Phosphate, as phosphorus | Multiply by 3.0974 | Divide by 3.0974 |
Example calculations
| Analyte | Starting value | Operation | Result |
|---|---|---|---|
| Glucose | 5.5 mmol/L | 5.5 × 18.0182 | 99.10 mg/dL |
| Total cholesterol | 5.2 mmol/L | 5.2 × 38.67 | 201.08 mg/dL |
| Triglycerides | 1.7 mmol/L | 1.7 × 88.57 | 150.57 mg/dL |
| Creatinine | 0.09 mmol/L | 0.09 × 11.312 | 1.02 mg/dL |
| Calcium | 2.35 mmol/L | 2.35 × 4.0078 | 9.42 mg/dL |
| Magnesium | 2.00 mg/dL | 2.00 ÷ 2.4305 | 0.82 mmol/L |
Understanding mmol/L and mg/dL conversions
Molar concentration counts chemical particles within each liter. Mass concentration measures their combined weight within one deciliter. These units therefore describe concentration from different scientific perspectives.
A millimole represents one-thousandth of a mole. Every substance has a distinct mass per mole. Molecular weight connects particle amounts with measured laboratory mass.
The conversion factor usually equals molecular weight divided by ten. The division adjusts millimoles, milligrams, liters, and deciliters together. This relationship supports accurate custom substance conversions when needed.
Glucose uses a factor near 18.018 because of its weight. Cholesterol requires a much larger factor near 38.67. Different chemical masses prevent one universal multiplier from working.
Triglycerides use a standardized clinical factor near 88.57. Their laboratory conversion differs from glucose and cholesterol values. Selecting the analyte prevents serious numerical interpretation errors today.
Reverse conversion divides mg/dL by the same analyte factor. Multiplying the result again should reproduce the starting value. This calculator displays that check beside every completed result.
Rounding affects presentation but not the internal calculation. More decimals may help research, auditing, or careful comparisons. Routine reading often needs only one or two decimals.
Custom mode accepts molecular weight measured in grams per mole. The calculator derives a factor directly from that entry. Verify the chemical form before trusting any custom calculation.
Some laboratory names describe related but different measurements. Urea differs from blood urea nitrogen in reporting. Phosphate may also be reported specifically as phosphorus mass.
Reference intervals depend on methods, populations, and clinical circumstances. Converted numbers do not create diagnoses or treatment decisions. Always compare results with the reporting laboratory’s stated interval.
Use the export buttons for records or later review. CSV supports spreadsheets, while PDF creates a portable summary. Keep the original laboratory report with every converted value.
Laboratory systems may print values with fewer visible decimals. Hidden precision can still affect repeated conversions slightly. Retain source values before applying additional rounding during comparisons.
Clinical conversion tables often publish rounded factors for practical use. Molecular calculations may produce slightly different final digits. Small differences usually reflect rounding, not a changed concentration.
The selected chemical form matters for salts and compounds. Hydrated forms can have different molecular weights than anhydrous forms. Match the molecular formula exactly before entering custom weights.
Spreadsheet exports preserve calculation details for organized review. PDF summaries create readable records for sharing or printing. Record the analyte and original unit beside every result.
Frequently asked questions
1. Is there one universal mmol/L to mg/dL factor?
No. Each analyte has a different molecular weight or accepted clinical factor.
2. What factor converts glucose?
Multiply glucose in mmol/L by 18.0182 to obtain mg/dL.
3. What factor converts cholesterol?
Multiply total, LDL, or HDL cholesterol by approximately 38.67.
4. What factor converts triglycerides?
Multiply triglycerides in mmol/L by approximately 88.57.
5. How does reverse conversion work?
Divide the mg/dL value by the selected analyte’s conversion factor.
6. Why does custom mode require molecular weight?
Molecular weight determines how many milligrams correspond with each millimole.
7. Can I enter scientific notation?
Yes. Modern numeric inputs and PHP validation can process scientific notation.
8. Why are negative values rejected?
A negative laboratory concentration is invalid for this conversion purpose.
9. Is urea the same as blood urea nitrogen?
No. Urea and blood urea nitrogen use different reporting conventions.
10. Does rounding change the stored calculation?
No. Rounding only changes the displayed result, not the internal value.
11. Can this calculator diagnose a medical condition?
No. It converts units only and cannot replace professional medical interpretation.