# Blood Test Unit Converter > Free blood test unit converter for 60+ biomarkers. Convert mg/dL, mmol/L, µmol/L, ng/dL and more instantly, with formulas and no sign-up. *Source: [https://www.health3.app/tools/blood-test-unit-converter](https://www.health3.app/tools/blood-test-unit-converter)* Convert blood test results between conventional units (mg/dL, ng/dL) and SI units (mmol/L, nmol/L) for over 50 biomarkers. Select your biomarker, enter a value, and get an instant conversion. ## How to Convert Blood Test Units Blood test results can be reported in different measurement units depending on the country, laboratory, or healthcare system. The two main systems are **conventional units** (commonly used in the United States) and **SI units** (Système International, used in most other countries). This can make it confusing to compare results from different labs or understand values from international medical literature. ### Why Do Different Countries Use Different Units? The United States primarily uses conventional units such as mg/dL (milligrams per deciliter) and ng/dL (nanograms per deciliter). Most of Europe, Australia, Canada, and the rest of the world use SI units such as mmol/L (millimoles per liter) and nmol/L (nanomoles per liter). The SI system was adopted internationally in the 1970s to standardize scientific measurement, but the US medical system largely retained the older conventional system. This means a glucose reading of **100 mg/dL** in the US is the same as **5.55 mmol/L** in Europe. Both values are identical, just expressed differently. ### Common Blood Test Unit Conversions | Biomarker | Conventional Unit | SI Unit | Multiply by | | --- | --- | --- | --- | | Glucose | mg/dL | mmol/L | 0.0555 | | Total Cholesterol | mg/dL | mmol/L | 0.0259 | | LDL Cholesterol | mg/dL | mmol/L | 0.0259 | | HDL Cholesterol | mg/dL | mmol/L | 0.0259 | | Triglycerides | mg/dL | mmol/L | 0.0113 | | Creatinine | mg/dL | µmol/L | 88.4 | | Uric Acid | mg/dL | µmol/L | 59.48 | | Bilirubin (Total) | mg/dL | µmol/L | 17.1 | | Testosterone | ng/dL | nmol/L | 0.0347 | | Vitamin D (25-OH) | ng/mL | nmol/L | 2.496 | | Vitamin B12 | pg/mL | pmol/L | 0.7378 | | Iron | µg/dL | µmol/L | 0.1791 | | Cortisol | µg/dL | nmol/L | 27.59 | | Hemoglobin | g/dL | g/L | 10 | ### How Unit Conversion Works Each biomarker has a specific **conversion factor** based on its molecular weight. To convert from conventional units to SI units, you multiply by the conversion factor. To convert back, you divide by it. For example: - **Glucose:** 100 mg/dL × 0.0555 = 5.55 mmol/L - **Total Cholesterol:** 200 mg/dL × 0.0259 = 5.18 mmol/L - **Creatinine:** 1.0 mg/dL × 88.4 = 88.4 µmol/L - **Testosterone:** 500 ng/dL × 0.0347 = 17.35 nmol/L ### Worked Examples for Common Queries The questions below cover the conversions most readers ask about. Each one is biomarker-specific because molecular weights differ, so a single mg/dL value maps to different mmol/L values depending on what is being measured. #### What is 100 mg/dL in mmol/L? The answer depends on the biomarker: - **Glucose:** 100 mg/dL × 0.0555 = **5.55 mmol/L**. - **Total cholesterol:** 100 mg/dL × 0.0259 = **2.59 mmol/L**. - **LDL cholesterol:** 100 mg/dL × 0.0259 = **2.59 mmol/L**. - **HDL cholesterol:** 100 mg/dL × 0.0259 = **2.59 mmol/L**. - **Triglycerides:** 100 mg/dL × 0.0113 = **1.13 mmol/L**. - **Calcium:** 100 mg/dL × 0.2495 = **24.95 mmol/L**. #### What is 100 mg/dL LDL in mmol/L? An LDL cholesterol value of **100 mg/dL equals 2.59 mmol/L**. The conversion factor for LDL (and for HDL, VLDL, and total cholesterol) is `0.02586`, derived from the average molecular weight of cholesterol (386.65 g/mol). To convert any LDL value: `mmol/L = mg/dL × 0.02586` and `mg/dL = mmol/L × 38.67`. This numerical conversion does not classify the result; use the reference interval on the original report and discuss personal targets with a qualified healthcare professional. #### Does 1 mg/dL CRP equal mg/L? How do I convert? **1 mg/dL of CRP equals 10 mg/L.** Unlike the mg/dL ↔ mmol/L conversions above, this is not a molar conversion: CRP in mg/dL and CRP in mg/L describe *the same molecule* at the same concentration, just expressed against different volume units (1 deciliter = 100 mL = 0.1 liter). The conversion factor is therefore exactly 10: - CRP (mg/L) = CRP (mg/dL) × 10 - CRP (mg/dL) = CRP (mg/L) ÷ 10 Quick reference table: | CRP (mg/dL) | CRP (mg/L) | Conversion | | --- | --- | --- | | 0.05 | 0.5 | × 10 | | 0.1 | 1.0 | × 10 | | 0.3 | 3.0 | × 10 | | 0.5 | 5.0 | × 10 | | 1.0 | 10.0 | × 10 | Note that **hs-CRP** (high-sensitivity CRP) measures the same molecule with a more sensitive assay; the same 10× mg/dL ↔ mg/L factor applies. The other CRP unit you may see is **nmol/L**: CRP (nmol/L) = CRP (mg/L) × 9.524 (CRP molecular weight ~115 kDa, but reported as the pentameric form). #### Soluble transferrin receptor (sTfR) on an anemia panel The **soluble transferrin receptor** (sTfR) is a circulating fragment of the cell-surface transferrin receptor (TfR1). When cells are iron-starved, TfR1 expression rises and more receptor is shed into plasma, so sTfR concentration goes up in true iron-deficiency anemia. Combined with ferritin (sTfR/log-ferritin index, the "Thomas plot"), sTfR helps separate **iron-deficiency anemia** from **anemia of chronic disease**, which ferritin alone often cannot do because ferritin is an acute-phase reactant and rises in inflammation. A typical anemia panel that includes sTfR therefore looks like: CBC + reticulocyte count, ferritin, iron, TIBC/transferrin saturation, sTfR, and CRP (to gauge inflammation). Reference ranges depend on the assay; commonly ~**2.2–5.0 mg/L** in adults. Read more: [Soluble Transferrin Receptor (sTfR) reference ranges & clinical use](https://www.health3.app/biomarkers/stfr), [Ferritin](https://www.health3.app/biomarkers/ferritin), [Iron (serum)](https://www.health3.app/biomarkers/iron), and the [Iron Saturation Calculator](https://www.health3.app/tools/iron-saturation-calculator.html). ### Common Conversions: Dedicated Answer Pages For the highest-volume conversion queries, we publish dedicated pages that break the answer down per biomarker (because the same mg/dL value gives a different mmol/L answer depending on whether you are converting glucose, cholesterol, triglycerides, calcium, magnesium, or BUN). Each page shows the math for all common biomarkers in one place: [100 mg/dL to mmol/L](https://www.health3.app/tools/convert/100-mg-dl-to-mmol-l/) [150 mg/dL to mmol/L](https://www.health3.app/tools/convert/150-mg-dl-to-mmol-l/) [200 mg/dL to mmol/L](https://www.health3.app/tools/convert/200-mg-dl-to-mmol-l/) [250 mg/dL to mmol/L](https://www.health3.app/tools/convert/250-mg-dl-to-mmol-l/) [500 mg/dL to mmol/L](https://www.health3.app/tools/convert/500-mg-dl-to-mmol-l/) [1 mg/dL to mmol/L](https://www.health3.app/tools/convert/1-mg-dl-to-mmol-l/) [5 mg/dL to mmol/L](https://www.health3.app/tools/convert/5-mg-dl-to-mmol-l/) [10 mg/dL to mmol/L](https://www.health3.app/tools/convert/10-mg-dl-to-mmol-l/) [50 mg/dL to mmol/L](https://www.health3.app/tools/convert/50-mg-dl-to-mmol-l/) [55 mg/dL to mmol/L](https://www.health3.app/tools/convert/55-mg-dl-to-mmol-l/) [70 mg/dL to mmol/L](https://www.health3.app/tools/convert/70-mg-dl-to-mmol-l/) [231 mg/dL to mmol/L](https://www.health3.app/tools/convert/231-mg-dl-to-mmol-l/) [5 mmol/L to mg/dL](https://www.health3.app/tools/convert/5-mmol-l-to-mg-dl/) [7 mmol/L to mg/dL](https://www.health3.app/tools/convert/7-mmol-l-to-mg-dl/) [10 mmol/L to mg/dL](https://www.health3.app/tools/convert/10-mmol-l-to-mg-dl/) #### Dedicated converters by substance If you know which substance you are converting, the per-substance pages carry the cited conversion factor, published reference intervals, and pre-computed answers for the values people search most: [LDL cholesterol converter](https://www.health3.app/tools/convert/ldl-cholesterol/) [Total cholesterol converter](https://www.health3.app/tools/convert/total-cholesterol/) [HDL cholesterol converter](https://www.health3.app/tools/convert/hdl-cholesterol/) [Triglycerides converter](https://www.health3.app/tools/convert/triglycerides/) [Glucose converter](https://www.health3.app/tools/convert/glucose/) [Creatinine converter](https://www.health3.app/tools/convert/creatinine/) [Uric acid converter](https://www.health3.app/tools/convert/uric-acid/) [CRP converter](https://www.health3.app/tools/convert/crp/) [Bilirubin converter](https://www.health3.app/tools/convert/bilirubin/) [Hemoglobin converter](https://www.health3.app/tools/convert/hemoglobin/) [Testosterone converter](https://www.health3.app/tools/convert/testosterone/) [HbA1c converter](https://www.health3.app/tools/convert/hba1c/) [nmol/L to mg/dL by substance](https://www.health3.app/tools/convert/nmol-l-to-mg-dl/) #### Popular biomarker-specific examples These pages show the arithmetic for frequently searched value and biomarker combinations. They convert units only and do not classify a result. [Creatinine: 1.2 mg/dL to µmol/L](https://www.health3.app/tools/convert/1_2-mg-dl-to-umol-l-creatinine/) [Free T4: 1.2 ng/dL to pmol/L](https://www.health3.app/tools/convert/1_2-ng-dl-to-pmol-l-ft4/) [Bilirubin: 1 mg/dL to µmol/L](https://www.health3.app/tools/convert/1-mg-dl-to-umol-l-bilirubin/) [Creatinine: 1 mg/dL to µmol/L](https://www.health3.app/tools/convert/1-mg-dl-to-umol-l-creatinine/) [Cortisol: 15 µg/dL to nmol/L](https://www.health3.app/tools/convert/15-ug-dl-to-nmol-l-cortisol/) [Testosterone: 20 nmol/L to ng/dL](https://www.health3.app/tools/convert/20-nmol-l-to-ng-dl-testosterone/) [Vitamin D: 30 ng/mL to nmol/L](https://www.health3.app/tools/convert/30-ng-ml-to-nmol-l-vitamin-d/) [Testosterone: 300 ng/dL to nmol/L](https://www.health3.app/tools/convert/300-ng-dl-to-nmol-l-testosterone/) [Uric acid: 380 µmol/L to mg/dL](https://www.health3.app/tools/convert/380-umol-l-to-mg-dl-uric-acid/) [Uric acid: 6 mg/dL to µmol/L](https://www.health3.app/tools/convert/6-mg-dl-to-umol-l-uric-acid/) [Vitamin D: 75 nmol/L to ng/mL](https://www.health3.app/tools/convert/75-nmol-l-to-ng-ml-vitamin-d/) [Creatinine: 88 µmol/L to mg/dL](https://www.health3.app/tools/convert/88-umol-l-to-mg-dl-creatinine/) Or use the converter at the top of this page for any other value or unit pair. ### Tips for Comparing Blood Test Results - Always check the units printed on your lab report before comparing values with reference ranges or past results. - When comparing results from different labs or countries, convert to the same unit system first. - Some biomarkers (like HbA1c or TSH) use the same units worldwide, so no conversion is needed. - If in doubt, ask your healthcare provider to clarify which units your results are in. **Educational use only:** This tool performs mechanical unit conversions and provides general informational context. It does not diagnose, assess whether a result is healthy, recommend treatment, or replace a qualified medical professional. Conversion factors may vary slightly between laboratories; use the units and reference interval on your original report and discuss personal questions with your healthcare provider.