HbA1c 5.7% · 39 mmol/mol

HbA1c 5.7%

Converted with the published ADAG regression. What it means for you is a question for a doctor, not for this page.

Converted value

117mg/dL eAG

An HbA1c of 5.7% converts to an estimated average glucose of about 117 mg/dL — 6.5 mmol/L. In IFCC units the same result is 39 mmol/mol.

Against the American Diabetes Association criteria, 5.7% is inside the prediabetes range of 5.7% to 6.4%. That describes where the value sits on a published scale. It is not a diagnosis, and a diagnosis requires confirmation and a doctor.

Central estimate, not a reading. The regression explained about 84% of the variation, so real averages sit either side of this figure.

SOURCE·ADAG regression, Diabetes Care 2008 · NGSP master equation·bands from ADA Standards of Care 2025·REVIEWED JUL 2026

This page is reference information, not medical advice.

Nothing here can diagnose you, and nothing here is a treatment plan. Blood glucose results are interpreted by a doctor alongside your history, your symptoms and a repeat test — a single number on a screen is not a diagnosis. If any reading concerns you, or if you feel unwell, see a doctor rather than a website.

The arithmetic behind 5.7%

The ADAG regression is applied directly: 28.7 × 5.7 − 46.7 = 116.9 mg/dL.
That figure is divided by 18.016, the molar mass of glucose in these units, giving 6.49 mmol/L.
The NGSP master equation converts the percentage to the IFCC unit: (5.7 − 2.15) × 10.929 = 38.8 mmol/mol.
Rounded for display to 117 mg/dL, 6.5 mmol/L and 39 mmol/mol — the precision laboratories report.
Nothing on this page is interpreted. Where the value sits against a published band is a fact about the band; what it means for a person is a clinical judgement.

28.7 x 5.7 - 46.7        = 116.9 mg/dL
116.9 / 18.016             = 6.49 mmol/L
(5.7 - 2.15) x 10.929   = 38.8 mmol/mol

Full methodology →

Provenance

The equations, and who published them

The regression is the ADAG equation from Diabetes Care 2008, which is the one the American Diabetes Association uses; the mmol/mol line is the NGSP master equation. Neither was adjusted here.

Source: Nathan DM, Kuenen J, Borg R, Zheng H, Schoenfeld D, Heine RJ, for the A1c-Derived Average Glucose (ADAG) Study Group. Translating the A1C assay into estimated average glucose values. Diabetes Care 2008;31(8):1473–1478. Link
Source: National Glycohemoglobin Standardization Program (NGSP) — HbA1c and estimated average glucose (eAG). Link

Neighbouring rows

Where 5.7% sits

HbA1c converted to estimated average glucose with the ADAG regression, eAG (mg/dL) = 28.7 × A1C − 46.7. The mmol/mol column is the IFCC unit, from the NGSP master equation. The final column reads the A1C against the ADA diagnostic bands.
HbA1c (%)	mmol/mol	eAG (mg/dL)	eAG (mmol/L)	Where it sits
5.2%	33	103	5.7	Below the prediabetes range
5.3%	34	105	5.9	Below the prediabetes range
5.4%	36	108	6.0	Below the prediabetes range
5.5%	37	111	6.2	Below the prediabetes range
5.6%	38	114	6.3	Below the prediabetes range
5.7%	39	117	6.5	In the prediabetes range
5.8%	40	120	6.6	In the prediabetes range
5.9%	41	123	6.8	In the prediabetes range
6.0%	42	126	7.0	In the prediabetes range
6.1%	43	128	7.1	In the prediabetes range
6.2%	44	131	7.3	In the prediabetes range

Estimated average glucose is an average across roughly the previous three months. It is not a prediction of your reading tomorrow morning, and two people with the same HbA1c can have very different day-to-day swings.

SOURCE·ADAG regression (Diabetes Care 2008) · NGSP master equation·REVIEWED JUL 2026

The complete chart from 4.0% to 14.0% →

What this page is careful not to say

It does not tell you whether 5.7% is good or bad for you, because that depends on things a web page cannot see — whether you have already been diagnosed, what else is on your report, whether you have a condition that makes HbA1c unreliable, and what your doctor is trying to achieve. It publishes no targets for anyone.

A result in this range is a reason to see a doctor and follow their advice about repeating the test — not a reason to start any diet, supplement or medicine you read about online.

PeakForm is a training and accountability programme. It is not a treatment for diabetes or prediabetes, it is not a substitute for your doctor's advice, and nothing on this site should be acted on before speaking to one.

Nearby values

5.2%103 mg/dL 5.3%105 mg/dL 5.4%108 mg/dL 5.5%111 mg/dL 5.6%114 mg/dL 5.7%117 mg/dL 5.8%120 mg/dL 5.9%123 mg/dL 6.0%126 mg/dL 6.1%128 mg/dL 6.2%131 mg/dL

Questions this report anticipates

What does an HbA1c of 5.7% mean?

On the American Diabetes Association criteria, 5.7% is inside the prediabetes range of 5.7% to 6.4%. It converts to an estimated average glucose of about 117 mg/dL (6.5 mmol/L) using the ADAG equation. A single value is not a diagnosis — published criteria require confirmation, and interpretation belongs to a doctor.

What is 5.7% HbA1c in mg/dL?

About 117 mg/dL as an estimated average glucose across the previous two to three months, from eAG = 28.7 × 5.7 − 46.7. That is an average, not a reading you would expect to see on a meter at any particular moment.

What is 5.7% in mmol/mol?

39 mmol/mol, using the NGSP master equation (percentage − 2.15) × 10.929. Both units describe the same measurement.

General information only — NOT medical advice, and never a diagnosis. Only a doctor can interpret your results and diagnose or treat diabetes. If a reading concerns you, see a doctor rather than a website. Every threshold, equation and glycemic index value used on this site is listed with its publication on the data & method page, and every publication is listed with its issuing body and its date in the source register.

SOURCE·Published reference ranges + GI tables·REVIEWED JUL 2026

The people behind these sites

Follow the build

This site and nine others like it are built and photographed by two people: Amit Sharma — behind the build; Geeta Patel — the poses, demonstrated. New work goes up on Instagram and Facebook before it reaches a page here.

Amit Sharma @amitsharmaofficial Instagram

Geeta Patel @geetapatelnz Instagram

Geeta Patel GeetaPatelYoga Facebook

Following changes nothing here — every page stays open, with no account and no wall.