What do my blood sugar numbers mean?
On the defaults — fasting glucose 95 mg/dL, two-hour glucose 165 mg/dL and A1C 6.8% — the fasting glucose is Normal, the two-hour glucose is Prediabetes and the A1C is Diabetes: one normal, one prediabetes, one diabetes. A diabetes panel reports three numbers: fasting glucose in mg/dL (after at least 8 hours without food), glucose two hours after eating in mg/dL, and A1C as a percentage (average blood sugar over the past 2–3 months). The standard bands come from the American Diabetes Association. A single high reading does not diagnose anything — doctors repeat the test before diagnosing. This page is educational only, not medical advice — talk to a clinician about any result.
Five things about the chart are worth stating plainly. First, fasting glucose is judged on its own band: under 100 is Normal, 100–125 is Prediabetes, 126 and over is Diabetes — 95 is Normal. Second, two-hour glucose has its own higher bands: under 140 is Normal, 140–199 is Prediabetes, 200 and over is Diabetes — 165 is Prediabetes. Third, A1C is a percentage with one decimal place: under 5.7% is Normal, 5.7–6.4% is Prediabetes, 6.5% and over is Diabetes — 6.8% is Diabetes. Fourth, the three numbers can disagree — one normal, one prediabetes, one diabetes is a common mixed picture, and no single number is the whole story. And fifth, bands are inclusive at the low end — fasting 100 is already Prediabetes, 99 is Normal; all listed in Accuracy & limitations.
The worked example, line by line
Setup: fasting glucose 95 mg/dL, two-hour glucose 165 mg/dL, A1C 6.8%.
Line 1 — fasting glucose. 95 falls in under 100, so the fasting glucose is Normal.
Line 2 — two-hour glucose. 165 falls in 140–199, so the two-hour glucose is Prediabetes.
Line 3 — A1C. 6.8% falls in 6.5% and over, so the A1C is Diabetes.
Line 4 — the picture. One normal, one prediabetes, one diabetes: fasting Normal, two-hour Prediabetes, A1C Diabetes.
Table 1 — Blood sugar bands by measurement
The standard American Diabetes Association bands. Fasting glucose in mg/dL after at least 8 hours without food; two-hour glucose in mg/dL two hours after eating; A1C as a percentage, average blood sugar over the past 2–3 months. Bands are inclusive at the low end: fasting 100 is already Prediabetes, fasting 126 is already Diabetes, two-hour 140 is already Prediabetes, two-hour 200 is already Diabetes, A1C 5.7% is already Prediabetes, A1C 6.5% is already Diabetes.
| Measurement | Range | Category |
|---|
| Fasting glucose | under 100 mg/dL | Normal |
| Fasting glucose | 100–125 mg/dL | Prediabetes |
| Fasting glucose | 126 mg/dL and over | Diabetes |
| Two-hour glucose | under 140 mg/dL | Normal |
| Two-hour glucose | 140–199 mg/dL | Prediabetes |
| Two-hour glucose | 200 mg/dL and over | Diabetes |
| A1C | under 5.7% | Normal |
| A1C | 5.7–6.4% | Prediabetes |
| A1C | 6.5% and over | Diabetes |
Every branch, checked
Fasting glucose 105 mg/dL: Fasting glucose 105 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes — Raise fasting to 105 and it is Prediabetes — above the 100 boundary.
Fasting glucose 130 mg/dL: Fasting glucose 130 mg/dL — Diabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes — Raise fasting to 130 and it is Diabetes — above the 126 boundary.
Two-hour glucose 120 mg/dL: Fasting glucose 95 mg/dL — Normal; two-hour glucose 120 mg/dL — Normal; A1C 6.8% — Diabetes — Drop two-hour glucose to 120 and it is Normal — below the 140 boundary.
Two-hour glucose 210 mg/dL: Fasting glucose 95 mg/dL — Normal; two-hour glucose 210 mg/dL — Diabetes; A1C 6.8% — Diabetes — Raise two-hour glucose to 210 and it is Diabetes — above the 200 boundary.
A1C 5.4%: Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.4% — Normal — Drop A1C to 5.4% and it is Normal — below the 5.7% boundary.
A1C 6.0%: Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.0% — Prediabetes — Raise A1C to 6.0% and it is Prediabetes — inside the 5.7–6.4% band.
All three at the prediabetes floor — fasting 100, two-hour 140, A1C 5.7%: Fasting glucose 100 mg/dL — Prediabetes; two-hour glucose 140 mg/dL — Prediabetes; A1C 5.7% — Prediabetes — At the prediabetes floor all three are Prediabetes — bands are inclusive at the low end.
The reverses, worked backwards
Smallest fasting glucose for Prediabetes: At the displayed 100 mg/dL fasting is Prediabetes. At 99 mg/dL fasting is Normal.
Largest fasting glucose still Normal: At the displayed 99 mg/dL fasting is Normal. At 100 mg/dL fasting is Prediabetes.
Smallest two-hour glucose for Diabetes: At the displayed 200 mg/dL two-hour glucose is Diabetes. At 199 mg/dL it is Prediabetes.
Smallest A1C for Diabetes: At the displayed 6.5% A1C is Diabetes. At 6.4% A1C is Prediabetes.
Largest A1C still Normal: At the displayed 5.6% A1C is Normal. At 5.7% A1C is Prediabetes.
Smallest fasting glucose for Diabetes: At the displayed 126 mg/dL fasting is Diabetes. At 125 mg/dL fasting is Prediabetes.
What the defaults assume
The defaults are fasting glucose 95 mg/dL, two-hour glucose 165 mg/dL and A1C 6.8% — Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. With Fasting glucose 105 mg/dL, Fasting glucose 105 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes — Raise fasting to 105 and it is Prediabetes — above the 100 boundary. With Fasting glucose 130 mg/dL, Fasting glucose 130 mg/dL — Diabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes — Raise fasting to 130 and it is Diabetes — above the 126 boundary. With Two-hour glucose 120 mg/dL, Fasting glucose 95 mg/dL — Normal; two-hour glucose 120 mg/dL — Normal; A1C 6.8% — Diabetes — Drop two-hour glucose to 120 and it is Normal — below the 140 boundary. With Two-hour glucose 210 mg/dL, Fasting glucose 95 mg/dL — Normal; two-hour glucose 210 mg/dL — Diabetes; A1C 6.8% — Diabetes — Raise two-hour glucose to 210 and it is Diabetes — above the 200 boundary. With A1C 5.4%, Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.4% — Normal — Drop A1C to 5.4% and it is Normal — below the 5.7% boundary. With A1C 6.0%, Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.0% — Prediabetes — Raise A1C to 6.0% and it is Prediabetes — inside the 5.7–6.4% band. With All three at the prediabetes floor — fasting 100, two-hour 140, A1C 5.7%, Fasting glucose 100 mg/dL — Prediabetes; two-hour glucose 140 mg/dL — Prediabetes; A1C 5.7% — Prediabetes — At the prediabetes floor all three are Prediabetes — bands are inclusive at the low end. With All best: fasting 90, two-hour 110, A1C 5.2%, Fasting glucose 90 mg/dL — Normal; two-hour glucose 110 mg/dL — Normal; A1C 5.2% — Normal — Every number in its best band. With All worst: fasting 140, two-hour 230, A1C 8.0%, Fasting glucose 140 mg/dL — Diabetes; two-hour glucose 230 mg/dL — Diabetes; A1C 8.0% — Diabetes — Every number in its worst band. With Fasting glucose 0, Input error — every reading must be above 0; the calculator shows an error, not a result. With A1C 5.7% and 5.6%, Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.7% — Prediabetes; Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.6% — Normal — A1C 5.7% is already Prediabetes; A1C 5.6% is Normal — the 5.7 boundary. With Two-hour glucose 140 and 139, Fasting glucose 95 mg/dL — Normal; two-hour glucose 140 mg/dL — Prediabetes; A1C 6.8% — Diabetes; Fasting glucose 95 mg/dL — Normal; two-hour glucose 139 mg/dL — Normal; A1C 6.8% — Diabetes — Two-hour 140 is already Prediabetes; two-hour 139 is Normal — the 140 boundary. With Fasting glucose 125 and 126, Fasting glucose 125 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes; Fasting glucose 126 mg/dL — Diabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes — Fasting 125 is Prediabetes; fasting 126 is already Diabetes — the 126 boundary. With A1C 6.4% and 6.5%, Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.4% — Prediabetes; Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.5% — Diabetes — A1C 6.4% is Prediabetes; A1C 6.5% is already Diabetes — the 6.5 boundary. A fasting glucose of 0 is an input error — every reading must be above 0, and the calculator shows an error, not a result.
Output · formula · meaning
| Output | Formula | What it means |
|---|
| Fasting glucose | input | 95 mg/dL. |
| Two-hour glucose | input | 165 mg/dL. |
| A1C | input | 6.8%. |
| Fasting glucose band | fasting < 100 Normal; 100–125 Prediabetes; 126+ Diabetes | Normal. |
| Two-hour glucose band | two-hour < 140 Normal; 140–199 Prediabetes; 200+ Diabetes | Prediabetes. |
| A1C band | A1C < 5.7% Normal; 5.7–6.4% Prediabetes; 6.5%+ Diabetes | Diabetes. |
| smallest fasting glucose for Prediabetes | step | 100 mg/dL → 100 mg/dL. |
| Below the revr1 star | neighbor | Fasting glucose 99 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| Above the revr1 star | neighbor | Fasting glucose 101 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| largest fasting glucose still Normal | step | 99 mg/dL → 99 mg/dL. |
| Below the revr2 star | neighbor | Fasting glucose 98 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| Above the revr2 star | neighbor | Fasting glucose 100 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| smallest two-hour glucose for Diabetes | step | 200 mg/dL → 200 mg/dL. |
| Below the revr3 star | neighbor | Fasting glucose 95 mg/dL — Normal; two-hour glucose 199 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| Above the revr3 star | neighbor | Fasting glucose 95 mg/dL — Normal; two-hour glucose 201 mg/dL — Diabetes; A1C 6.8% — Diabetes. |
| smallest A1C for Diabetes | step | 6.5% → 6.5%. |
| Below the revr4 star | neighbor | Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.4% — Prediabetes. |
| Above the revr4 star | neighbor | Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.6% — Diabetes. |
| largest A1C still Normal | step | 5.6% → 5.6%. |
| Below the revr5 star | neighbor | Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.5% — Normal. |
| Above the revr5 star | neighbor | Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.7% — Prediabetes. |
| smallest fasting glucose for Diabetes | step | 126 mg/dL → 126 mg/dL. |
| Below the revr6 star | neighbor | Fasting glucose 125 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| Above the revr6 star | neighbor | Fasting glucose 127 mg/dL — Diabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| Fasting glucose 105 mg/dL | same model | Fasting glucose 105 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| Fasting glucose 130 mg/dL | same model | Fasting glucose 130 mg/dL — Diabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes. |
| Two-hour glucose 120 mg/dL | same model | Fasting glucose 95 mg/dL — Normal; two-hour glucose 120 mg/dL — Normal; A1C 6.8% — Diabetes. |
| Two-hour glucose 210 mg/dL | same model | Fasting glucose 95 mg/dL — Normal; two-hour glucose 210 mg/dL — Diabetes; A1C 6.8% — Diabetes. |
| A1C 5.4% | same model | Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.4% — Normal. |
| A1C 6.0% | same model | Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.0% — Prediabetes. |
| All three at the prediabetes floor — fasting 100, two-hour 140, A1C 5.7% | same model | Fasting glucose 100 mg/dL — Prediabetes; two-hour glucose 140 mg/dL — Prediabetes; A1C 5.7% — Prediabetes. |
Who uses this
- The person who just got a lab report with fasting 95, two-hour 165 and A1C 6.8%: they learn one number is Normal, one is Prediabetes and one is Diabetes — and they check the 100 / 140 / 5.7% floor to see all three turn Prediabetes at once.
- The person watching a fasting number near 100: they learn 99 is Normal but 100 is already Prediabetes — and they check the 126 reverse to see the fasting number for Diabetes.
- The person tracking A1C: they learn 6.8% is Diabetes, 6.4% is Prediabetes and 5.6% is Normal — and they check the 6.5% reverse to see the A1C where Diabetes starts.
- The person checking a two-hour number after a meal: they learn 165 is Prediabetes, 139 is Normal and 200 is Diabetes — and they check the all-best edge to see what three Normal numbers look like.
Accuracy & limitations
The chart is first-principles: each reading is compared against the standard American Diabetes Association bands, inclusive at the low end, and A1C is shown with one decimal place. What the chart cannot do is diagnose anything: a single high reading does not diagnose diabetes — doctors repeat the test before diagnosing; the bands are population cut-offs, not a verdict on one person; fasting means at least 8 hours without food, and a snack in between changes the fasting number; A1C is an average over 2–3 months, so it hides day-to-day swings; and home meters and lab tests can differ by a few points. This page is educational only, not medical advice — talk to a clinician about any result.
Cite this calculatorBright Side Kit. “Blood Sugar Levels Chart: Fasting, After Meals & A1C” brightoolbox.com, 2026. Method: fasting glucose: under 100 mg/dL Normal, 100–125 mg/dL Prediabetes, 126 mg/dL and over Diabetes; two-hour glucose: under 140 mg/dL Normal, 140–199 mg/dL Prediabetes, 200 mg/dL and over Diabetes; A1C: under 5.7% Normal, 5.7–6.4% Prediabetes, 6.5% and over Diabetes; bands inclusive at the low end; A1C shown with one decimal place. Reverses: smallest fasting glucose for Prediabetes is 100 mg/dL (at 100 mg/dL the figures are Fasting glucose 100 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes; at the lower neighbor the figures are Fasting glucose 99 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes); largest fasting glucose still Normal is 99 mg/dL (at 99 mg/dL the figures are Fasting glucose 99 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes; at the lower neighbor the figures are Fasting glucose 98 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes); smallest two-hour glucose for Diabetes is 200 mg/dL (at 200 mg/dL the figures are Fasting glucose 95 mg/dL — Normal; two-hour glucose 200 mg/dL — Diabetes; A1C 6.8% — Diabetes; at the lower neighbor the figures are Fasting glucose 95 mg/dL — Normal; two-hour glucose 199 mg/dL — Prediabetes; A1C 6.8% — Diabetes); smallest A1C for Diabetes is 6.5% (at 6.5% the figures are Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.5% — Diabetes; at the lower neighbor the figures are Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.4% — Prediabetes); largest A1C still Normal is 5.6% (at 5.6% the figures are Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.6% — Normal; at the lower neighbor the figures are Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 5.5% — Normal); smallest fasting glucose for Diabetes is 126 mg/dL (at 126 mg/dL the figures are Fasting glucose 126 mg/dL — Diabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes; at the lower neighbor the figures are Fasting glucose 125 mg/dL — Prediabetes; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes) Defaults: Fasting glucose 95 mg/dL — Normal; two-hour glucose 165 mg/dL — Prediabetes; A1C 6.8% — Diabetes Bright Side Kit. "Blood Sugar Levels Chart: Fasting, After Meals & A1C" https://brightoolbox.com/blood-sugar-levels-chart/ Accessed October 26, 2026.
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Frequently asked questions
What is a normal fasting blood sugar?
Under 100 mg/dL. Fasting glucose under 100 is Normal, 100–125 is Prediabetes and 126 and over is Diabetes. Fasting 95 is Normal; fasting 100 is already Prediabetes.
What is a normal blood sugar two hours after eating?
Under 140 mg/dL. Two-hour glucose under 140 is Normal, 140–199 is Prediabetes and 200 and over is Diabetes. Two-hour 165 is Prediabetes; two-hour 139 is Normal.
What is a normal A1C?
Under 5.7%. A1C under 5.7% is Normal, 5.7–6.4% is Prediabetes and 6.5% and over is Diabetes. A1C 6.8% is Diabetes; A1C 5.6% is Normal.
What does it mean if one number is diabetes and the others are not?
A mixed picture is common. On the defaults the fasting glucose is Normal, the two-hour glucose is Prediabetes and the A1C is Diabetes — one of each. No single number is the whole story, and a single high reading does not diagnose anything.
What are the three numbers on a diabetes panel?
Fasting glucose, two-hour glucose, and A1C. Fasting glucose in mg/dL after at least 8 hours without food, glucose two hours after eating in mg/dL, and A1C as a percentage — average blood sugar over the past 2–3 months.
Is 100 fasting blood sugar prediabetes?
Yes. Bands are inclusive at the low end: fasting 100 mg/dL is already Prediabetes, and fasting 99 mg/dL is Normal.
What A1C means diabetes?
6.5% and over. A1C 6.5% is already Diabetes; A1C 6.4% is Prediabetes. A1C is a percentage with one decimal place.
Should I worry about one high reading?
Talk to a clinician. This page is educational only, not medical advice. A single high reading does not diagnose anything — doctors repeat the test before diagnosing.