Home › Medical & Clinical › Glucose Unit Converter

Glucose Unit Converter

Converts blood glucose between mg/dL (US) and mmol/L (SI) using the molar mass of glucose (1 mmol/L = 18.016 mg/dL, i.e. mg/dL × 0.0555).

When to use

A glucose reading, target or threshold is in the other unit system.

Do not use when: You need average glucose from A1C (use a1c-to-glucose) or a different analyte such as cholesterol (use cholesterol-unit-conversion).

Formula

mmol_l = mg_dl × 0.0555; mg_dl = mmol_l / 0.0555 (= mmol_l × 18.016, from the molar mass of glucose 180.16 g/mol)

The factor 0.0555 is the rounded reciprocal of 18.016; using 18 instead changes results by less than 0.1%. Results are informational only and not a substitute for clinical judgement or medical advice.

Inputs

Parameter	Type	Unit	Required	Description
`value`	number		yes	The glucose reading to convert. Range: > 0, ≤ 5000
`from_unit`	enum: mg_dl \| mmol_l		yes	Unit of the entered value.

Outputs

Output	Type	Unit	Description
`mg_dl`	number	mg/dL	Value in mg/dL.
`mmol_l`	number	mmol/L	Value in mmol/L.
`conversion`	string		The factor used.

Example

100 mg/dL to mmol/L: {"value":100,"from_unit":"mg_dl"} → {"mmol_l":5.55,"mg_dl":100}

7.8 mmol/L to mg/dL: {"value":7.8,"from_unit":"mmol_l"} → {"mg_dl":140.5,"mmol_l":7.8}

GET https://tttkmbb.com/api/v1/calculate/glucose-unit-conversion?value=100&from_unit=mg_dl

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/glucose-unit-conversion (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/glucose-unit-conversion · Markdown: https://tttkmbb.com/medical/glucose-unit-conversion.md · JSON definition: https://tttkmbb.com/medical/glucose-unit-conversion.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="glucose-unit-conversion"
OpenAPI operationId: convert_glucose_units
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

American Diabetes Association – Diagnosis (A1C, fasting and OGTT thresholds) (standard)
Wikipedia – Blood sugar level (unit conversion) (reference)

FAQ

Which countries use which unit?

mg/dL is standard in the US, Germany, Austria, France, Japan and India; mmol/L in the UK, Canada, Australia, China and most of Europe.

What are the ADA diagnostic thresholds in both units?

Fasting: 100–125 mg/dL (5.6–6.9 mmol/L) prediabetes, ≥126 mg/dL (7.0 mmol/L) diabetes; 2-hour OGTT ≥200 mg/dL (11.1 mmol/L) diabetes.

Related calculators

A1C to Average Glucose Calculator — Convert A1C to average glucose.
Cholesterol Unit Converter — Lipid units use different factors.