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Health · Diabetes & Metabolic Health

HbA1c Percentage and mmol/mol Converter

Convert a recorded HbA1c result between NGSP percentage and IFCC mmol/mol using the maintained master relationship.

Health · Diabetes & Metabolic Health

Enter your measurements

Private in-browser calculation · no account or saved health record
Supported reporting domain: 3–20% or 9–195 mmol/mol, according to the selected direction.

Health values stay in this browser tab. They are not added to the URL, analytics, storage, or a cloud record.

Health result

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Enter valid values to see the result.

Your entries are calculated in this browser and are not submitted to 365CALCS.COM.

Quick guide

How to use this calculator

  1. Use the labels and unit notes to enter the requested measurement, date, time, or observation exactly as recorded.
  2. Check the visible method, population, and unit basis before using the result; switch modes rather than converting values mentally.
  3. Read the calculation audit and limitations together. The result supports measurement or tracking and does not replace diagnosis, treatment, or urgent medical assessment.

Calculation method

How the hba1c percentage and mmol/mol converter works

NGSP (%) = 0.09148 × IFCC (mmol/mol) + 2.152; IFCC = (NGSP − 2.152) ÷ 0.09148.

This changes the reporting unit, not the underlying laboratory result or its clinical meaning.

Worked example

HbA1c Percentage and mmol/mol Converter example

An HbA1c of 7.0% converts to approximately 53 mmol/mol.

NGSP (%) = 0.09148 × IFCC (mmol/mol) + 2.152; IFCC = (NGSP − 2.152) ÷ 0.09148.

Supported inputs

Precision and limits

Supported purpose

The displayed result is rounded. Preserve the original laboratory value and reporting system when communicating the result.

Measurement quality

The output is only as reliable as the entered measurement, device, timing, units, and applicable reference population. Recheck unexpected values against the original record.

Clinical boundary

This calculator does not diagnose a condition, choose treatment, change medication, or determine that an urgent symptom is safe to monitor at home. Contact an appropriate health professional or local emergency service when the situation may be urgent.

Privacy

Entered health values and results stay in this browser tab. They are not placed in URLs, analytics, logs, local storage, session replay, or a cloud record by this calculator.

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