HbA1c Unit Converter (% ↔ IFCC)
It is the same test reported in different units: the US, Korea and Japan use percent (NGSP) while much of Europe uses mmol/mol (IFCC). 6.5% is 48 mmol/mol. The estimated average glucose is shown too.
Your numbers
IFCC (mmol/mol)
47.5mmol/mol
Average glucose
139.8mg/dL
mmol/L
7.77mmol/L
Formula
IFCC (mmol/mol) = (HbA1c (%) − 2.15) × 10.929
The two units are linearly related, so the conversion is exact. The average-glucose estimate, however, is statistical and varies between people.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| HbA1c (%) (%)Blood sugar averaged over the past two to three months. | 6.5 | 3 ~ 20 |
Step by step
Quick reference table
Results when only HbA1c (%) (%) changes and everything else stays put.
| HbA1c (%) (%) | IFCC (mmol/mol) (mmol/mol) | Average glucose (mg/dL) | mmol/L (mmol/L) |
|---|---|---|---|
| 3.25 | 12 | 46.6 | 2.59 |
| 4.88 | 29.8 | 93.4 | 5.19 |
| 6.5 | 47.5 | 139.8 | 7.77 |
| 9.75 | 83.1 | 233.1 | 12.95 |
| 13 | 118.6 | 326.4 | 18.13 |
What each result means
| Result | At default values |
|---|---|
| IFCC (mmol/mol) (mmol/mol)HbA1c in mmol/mol, the unit used across Europe. | 47.5 |
| Average glucose (mg/dL)The A1c figure translated back into an average blood sugar. | 139.8 |
| mmol/L (mmol/L)The European blood-sugar unit — mg/dL divided by 18. | 7.77 |
Common mistakes
The two units are linearly related, so the conversion is exact. The average-glucose estimate, however, is statistical and varies between people.
Glossary
- HbA1c (%)
- Blood sugar averaged over the past two to three months.
- IFCC (mmol/mol)
- HbA1c in mmol/mol, the unit used across Europe.
- Average glucose
- The A1c figure translated back into an average blood sugar.
- mmol/L
- The European blood-sugar unit — mg/dL divided by 18.
Frequently asked questions
Q. How is HbA1c Unit Converter (% ↔ IFCC) calculated?
IFCC (mmol/mol) = (HbA1c (%) − 2.15) × 10.929 — It is the same test reported in different units: the US, Korea and Japan use percent (NGSP) while much of Europe uses mmol/mol (IFCC). 6.5% is 48 mmol/mol. The estimated average glucose is shown too.
Q. Can you walk through an example?
With HbA1c (%) 6.5%, the answer is IFCC (mmol/mol) 47.5mmol/mol.
Q. What do I need to enter?
Enter HbA1c (%). The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only HbA1c (%) (%) moves the answer to HbA1c (%) (%) 3.25 → IFCC (mmol/mol) (mmol/mol) 12 and HbA1c (%) (%) 13 → IFCC (mmol/mol) (mmol/mol) 118.6. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
The two units are linearly related, so the conversion is exact. The average-glucose estimate, however, is statistical and varies between people.
Related calculators
These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.