A1c unit converter
Convert A1c between % and mmol/mol. Type in either box. The factors come from our catalog and are checked by code.
AI-verified against cited sources. Awaiting expert reviewLast reviewed 2026-10-03
mmol/mol = % × 10.9314 − 23.524. Nothing you type here leaves your browser.
The conversion
- % and mmol/molFrom % to mmol/mol: mmol/mol = % × 10.93 − 23.52. Back again: % = mmol/mol × 0.09148 + 2.152.
Common values
From zero to about twice the usual upper limit, plus the usual limits themselves.
| % | mmol/mol |
|---|---|
| 4 | 20 |
| 4.8 | 29 |
| 5.6 | 38 |
| 5.7 | 39 |
| 6 | 42 |
| 6.5 | 48 |
| 8 | 64 |
| 10 | 86 |
| 12 | 108 |
Usual ranges in each unit
What labs print as the reference range, by who was tested. Sources for each range are on the A1c page.
| Who | % | mmol/mol |
|---|---|---|
| Adults | 4.8–5.6 | 29–38 |