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Fasting Blood Glucose Reference

See which ADA range a fasting plasma glucose result falls in, in mg/dL and mmol/L.

For everyoneDiabetes & metabolic healthv1.0.1

Your measurements

Calculated on your device. Nothing is sent to a server.

Your result will appear here

Enter your measurements, then press Calculate.

Methodology

ADA Standards of Care diagnostic thresholds

Normal < 100 mg/dL (5.6 mmol/L); prediabetes 100–125 (5.6–6.9); diabetes range ≥ 126 (7.0)

These are the fasting plasma glucose thresholds in the American Diabetes Association Standards of Care. A diagnosis of diabetes requires confirmation, usually by repeating the test.

Who it is for
Non-pregnant adults; plasma glucose after at least 8 hours without food.
Version
1.0.1

How this calculator works

Where the formula comes from

  • The ADA 2026 Standards define the diabetes range as fasting plasma glucose of 126 mg/dL (7.0 mmol/L) or more, with fasting defined as no caloric intake for at least 8 hours.[1]
  • Impaired fasting glucose (prediabetes) is 100–125 mg/dL (5.6–6.9 mmol/L).[1]

The inputs

  • In the absence of unequivocal hyperglycaemia, a diagnosis of diabetes requires confirmatory testing.[1]

Where accuracy falls (published evidence)

  • ADA uses glucose below 70 mg/dL (3.9 mmol/L) as the threshold for level 1 hypoglycaemia.[2]

Sources

  1. American Diabetes Association Professional Practice Committee for Diabetes. 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes—2026. Diabetes Care. 2026;49(Suppl 1):S27–S49. doi:10.2337/dc26-S002
  2. American Diabetes Association Professional Practice Committee for Diabetes. 6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes—2026. Diabetes Care. 2026;49(Suppl 1):S132–S149. doi:10.2337/dc26-S006

Compiled from the published sources above. Every statement was agreed independently by three AI research tools (Claude, ChatGPT, DeepSeek) and its source verified in PubMed or Crossref by the Hakeemly editorial team. Not reviewed by a doctor unless stated. Agreed on

Worked example: how to calculate fasting glucose

Inputs

Fasting plasma glucose
92 mg/dL

Result

Fasting glucose
92 mg/dL
Fasting glucose
5.1 mmol/L

70–99 mg/dL: normal fasting range

An illustration with sample values, worked out with the same method the tool above uses.

Limitations

  • Home glucose meters are less accurate than laboratory tests.
  • Different thresholds apply in pregnancy.
  • Illness, stress and some medicines raise glucose temporarily.

References

  1. American Diabetes Association Professional Practice Committee for Diabetes. 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes—2026. Diabetes Care. 2026;49(Suppl 1):S27–S49. doi:10.2337/dc26-S002
  2. American Diabetes Association Professional Practice Committee for Diabetes. 6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes—2026. Diabetes Care. 2026;49(Suppl 1):S132–S149. doi:10.2337/dc26-S006

Continue with your measurements

Shared measurements carry over automatically, in this tab only.

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