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HbA1c Conversion Calculator

Convert HbA1c between JDS and NGSP values. Instantly see the estimated average glucose (eAG) and the diabetes-range guide.

Input

Convert between the JDS value formerly used in Japan and the international NGSP value, and also see the estimated average glucose (eAG). Select the standard of the value on your test result and enter it.

Standard of the value you enter

%

Result

NGSP value (international)

6.0%

Diabetes-range guide (NGSP 6.5% or above):Below the threshold

JDS value (old standard)

5.64 %

NGSP value (current)

6.0 %

Estimated average glucose (eAG)

approx. 125 mg/dL

How it works

  • Converts HbA1c between the old standard (JDS value) and the international standard (NGSP value). The conversion formula is NGSP(%) = JDS(%) x 1.02 + 0.25 (Japan has used the NGSP value since 2012).
  • The estimated average glucose (eAG) is calculated as eAG(mg/dL) = 28.7 x NGSP value - 46.7. It is a guide to your average blood glucose over the past 1 to 2 months.
  • It shows the NGSP value, JDS value, and estimated average glucose together, so you can see what blood-glucose level in mg/dL a given HbA1c corresponds to.
  • The diabetes-range guide is an NGSP value of 6.5% or above (in Japan's specific health guidance, 5.6% or above is the guide threshold for health guidance).
  • HbA1c reflects the value at the time of blood sampling and may appear shifted in conditions such as anemia or kidney failure. Diagnosis is made together with other tests.
  • This tool provides a guide based on a general conversion formula and is not a diagnosis or medical service. Always consult a doctor for health-related decisions.