How to Use This Calculator
Use this tool to convert mg/L to mg/dL quickly for lab results. Select the lab substance if helpful, choose the conversion direction, and enter your numeric value. The result appears instantly with the formula used.
The default setting converts from mg/L to mg/dL. If your report is in mg/dL and your reference chart uses mg/L, switch to the reverse tab.
mg/L vs mg/dL: What Is the Difference?
Both mg/L and mg/dL measure concentration, or how much of a substance is present in a volume of fluid such as blood, urine, or plasma.
mg/L means milligrams per liter. It tells you how many milligrams of a substance are present in one full liter of fluid.
mg/dL means milligrams per deciliter. A deciliter is one-tenth of a liter. Because the volume is smaller, the number changes by a factor of 10.
How to Convert mg/L to mg/dL
Since there are 10 deciliters in 1 liter, the conversion factor is always 10. To convert milligrams per liter to milligrams per deciliter, divide by 10.
mg/dL = mg/L / 10 For example, if a C-Reactive Protein (CRP) result is 50 mg/L, divide 50 by 10. The result is 5.0 mg/dL.
How to Convert mg/dL to mg/L
To convert in the opposite direction, multiply the mg/dL value by 10.
mg/L = mg/dL x 10 For example, a glucose result of 90 mg/dL equals 900 mg/L.
Quick Conversion Reference Table
This table shows common values converted from milligrams per liter to milligrams per deciliter.
| mg/L value | mg/dL value |
|---|---|
| 1 mg/L | 0.1 mg/dL |
| 5 mg/L | 0.5 mg/dL |
| 10 mg/L | 1.0 mg/dL |
| 50 mg/L | 5.0 mg/dL |
| 100 mg/L | 10.0 mg/dL |
| 150 mg/L | 15.0 mg/dL |
| 200 mg/L | 20.0 mg/dL |
| 500 mg/L | 50.0 mg/dL |
Why Medical Unit Conversion Matters
Medical unit conversion is important for patient safety and accurate interpretation. Different countries, laboratories, and medical references may report the same substance using different units.
In the United States, mg/dL is common for many blood tests. Other regions may use mg/L or molar units such as mmol/L. When comparing results, make sure the units match before judging whether a value has changed.
Common Substances Measured in mg/L and mg/dL
C-Reactive Protein (CRP)
CRP is a marker of inflammation and is commonly reported in mg/L, especially for high-sensitivity cardiac tests.
Bilirubin
Bilirubin levels are used to assess liver health. In the United States, bilirubin is often reported in mg/dL, while international sources may use mg/L or µmol/L. For bilirubin-style molar conversions, see the µmol/L to mg/dL Conversion Calculator.
Albumin
Albumin is an important blood protein. Unit conversion may be useful when comparing records from different hospital systems or countries.
Frequently Asked Questions
Is mg/L the same as ppm?
For dilute aqueous solutions, 1 mg/L is approximately equal to 1 part per million (ppm), because 1 liter of water weighs about 1,000 grams.
Why do some labs use mg/L and others use mg/dL?
It often depends on regional standards and the instrument or reporting system used by the lab. US healthcare commonly uses mg/dL, while scientific literature and some international systems prefer liter-based measurements.
How do I convert mg/L to percentages?
To convert mg/L to a percentage, divide the mg/L value by 10,000. For example, 1000 mg/L equals 0.1%.
Does the substance change the mg/L to mg/dL conversion?
No. This conversion only changes the volume basis from liters to deciliters, so the factor is always 10. Substance-specific factors matter when converting to molar units such as mmol/L.
Conclusion
Accurately interpreting lab results starts with matching the units. To convert mg/L to mg/dL, divide by 10. To convert mg/dL to mg/L, multiply by 10.
Use the calculator above whenever you need fast results, and always discuss medical interpretation with your healthcare provider. For molecule-based conversions, compare this with the mg/dL to mmol/L calculator.