Convert mg/dL ↔ mmol/L
Choose the lab marker first. Conversion factors differ for glucose, cholesterol, and triglycerides.
Why this mg/dL and mmol/L calculator matters
Lab reports are not standardized globally. In the United States, many blood tests are displayed in mg/dL (milligrams per deciliter). In many other countries, results are shown in mmol/L (millimoles per liter). If you read medical studies, travel, or compare results from multiple clinics, quick and accurate unit conversion is essential.
This calculator lets you convert both directions in seconds while applying the correct factor for the specific analyte.
How to use the calculator
- Select the marker: Glucose, Cholesterol, or Triglycerides.
- Enter a value in either mg/dL or mmol/L.
- Click the conversion button for the direction you need.
- Read the converted value and formula summary in the result box.
Conversion factors used
| Marker | mg/dL → mmol/L | mmol/L → mg/dL |
|---|---|---|
| Glucose | mg/dL ÷ 18.0182 | mmol/L × 18.0182 |
| Cholesterol (Total / LDL / HDL) | mg/dL ÷ 38.67 | mmol/L × 38.67 |
| Triglycerides | mg/dL ÷ 88.57 | mmol/L × 88.57 |
Manual examples
Example 1: Glucose
If fasting glucose is 100 mg/dL, then:
100 ÷ 18.0182 = 5.55 mmol/L
Example 2: LDL cholesterol
If LDL is 130 mg/dL, then:
130 ÷ 38.67 = 3.36 mmol/L
Example 3: Triglycerides
If triglycerides are 1.70 mmol/L, then:
1.70 × 88.57 = 150.57 mg/dL
Quick interpretation tip for glucose
Common fasting glucose categories (adult, non-pregnant) are often summarized like this:
- Normal: below 100 mg/dL (below 5.6 mmol/L)
- Prediabetes: 100–125 mg/dL (5.6–6.9 mmol/L)
- Diabetes: 126 mg/dL or above (7.0 mmol/L or above) on repeat testing
Reference ranges and diagnosis always depend on your full clinical context and your clinician’s guidance.
FAQ
Can I use this for all blood tests?
No. This tool is built for glucose, cholesterol, and triglycerides. Other tests use different conversion formulas.
Why are there small rounding differences?
Different labs may round constants slightly differently. These differences are usually tiny and not clinically meaningful in routine use.
Is this medical advice?
No. This is an educational conversion tool. Discuss diagnosis, risk, and treatment with a qualified healthcare professional.