--- title: "Blood sugar levels: normal ranges vs. diabetes targets" description: "Normal fasting blood sugar is 99 mg/dL or below; with diabetes, the usual target is 80 to 130 before meals. Both charts, from the CDC and the NIH." canonical: https://glucosebench.com/blood-sugar-levels alternate_html: https://glucosebench.com/blood-sugar-levels language: en-US last_updated: 2026-09-27 type: guia --- # Normal blood sugar levels, and why a diabetes target is a different number 1. [Home](https://glucosebench.com/) 2. [Blood sugar basics](https://glucosebench.com/blood-sugar) 3. Normal blood sugar levels, and why a diabetes target is a different number Look up "normal blood sugar" and you'll find two sets of numbers that seem to disagree. They don't. One is for finding diabetes, the other for living with it. By **GlucoseBench editorial team**Updated September 27, 2026 ![Normal blood sugar levels, and why a diabetes target is a different number](https://glucosebench.com/img/guia-blood-sugar-levels-640.webp) Short answer For adults without diabetes, the CDC calls a fasting blood sugar of 99 mg/dL or below normal, 100 to 125 mg/dL prediabetes, and 126 mg/dL or above diabetes; an A1C below 5.7% is normal. If you already have diabetes, you aim for something else: for most people who aren't pregnant, the CDC's target is 80 to 130 mg/dL before meals and below 180 mg/dL one to two hours after. "Low" moves too: below 70 mg/dL for most people with diabetes, and typically below 55 mg/dL for people without it, according to MedlinePlus. None of the sources we read gives adults a separate normal range by age, although a doctor may set a different diabetes target based on age and health. ## The blood sugar chart: normal vs. target The middle column is what a screening test calls normal. The right column is the usual goal once you've been diagnosed with diabetes. When it's measured Without diabetes (normal) With diabetes (usual target) Fasting, or before a meal 99 mg/dL or below 80 to 130 mg/dL 1 to 2 hours after a meal No home number given. On the 2-hour lab glucose tolerance test, normal is 139 mg/dL or below (NIDDK) Below 180 mg/dL Any time of day (random) No normal cutoff given; 200 mg/dL or above is the diabetes range (NIDDK footnote: "Used when there are symptoms") No separate target given A1C (average of about the past 3 months) Below 5.7% 7% or less for most people (CDC) With a continuous monitor (CGM) Not given 70 to 180 mg/dL, at least 70% of the time (NIDDK) Low Typically below 55 mg/dL (MedlinePlus) Below 70 mg/dL Sources, all read on September 27, 2026: CDC, "Diabetes Testing" and "Monitoring Your Blood Sugar" (May 15, 2024); NIDDK, "Diabetes Tests & Diagnosis" (July 2022) and "Managing Diabetes" (October 2023); MedlinePlus, "Hypoglycemia" (April 17, 2023). All in mg/dL; none of these public sources gives mmol/L, so we don't either. The CDC's targets are "for most people with diabetes who aren't pregnant," and its 2-hour lab table has 140 in both the normal and the prediabetes row, so the chart uses the NIDDK figure. The A1C goal is from the CDC page "A1C Test for Diabetes and Prediabetes" (May 15, 2024). ## Same number, two meanings Take a fasting reading of 110 mg/dL. On a screening test, the CDC puts it in the prediabetes range. For someone who already has diabetes, the same 110 before breakfast sits inside the 80 to 130 target. Neither reading is wrong; they answer different questions. That's also why a number from a home meter, a pharmacy or a health fair isn't a diagnosis. The NIDDK is direct: a blood glucose meter "cannot diagnose diabetes," and "usually, your doctor will use a second test to confirm you have diabetes." The CDC says to follow up with your doctor, who "may want to re-test you to make sure the results are accurate." ## Is there a normal range by age? Not for adults, in anything we read. The CDC and NIDDK screening cutoffs are the same at 30 or 70. Age shows up in the diabetes targets instead: the CDC says yours "may be different based on your age, health status and diabetes management plan," and the NIDDK says goals may differ "if you are an adult over age 65 and have had diabetes for a long time." Age also decides when to get checked. The NIDDK lists being 35 or older as a risk factor for type 2 diabetes, and says adults with normal results "should be retested every 3 years." Children and pregnancy have their own rules, which this chart doesn't cover. ## What "healthy blood sugar levels" means on a label ### The careful wording Glyco Pulse's label says it "May Support Healthy Blood Sugar Levels Already Within The Normal Range." Glycotide's says it "May Help Maintain Healthy Blood Sugar Levels Already Within The Normal Range." ### Read it against the chart "Already within the normal range" means the "without diabetes" column: fasting at 99 mg/dL or below, A1C under 5.7%. By their own words, these labels are written for people who are already there, not for someone with a diabetes diagnosis. ### "Supports" is not a number BloodArmor's bottle says "Supports Healthy Blood Sugar Levels," and Gluco Extend is sold for healthy levels too. Neither names a number. NCCIH, part of the NIH, finds "weak evidence of a possible benefit" for a few supplements and none for most. ### On diabetes medication NCCIH: "People who take diabetes drugs should tell their health care providers about any herbal supplements they are taking." Show the label, not just the product name. ## Frequently asked questions **What is a normal blood sugar level for adults?** Fasting, 99 mg/dL or below, per the CDC and the NIDDK. An A1C below 5.7% is also normal. For after meals, see our page on blood sugar after eating. **Is 120 blood sugar normal?** It depends on when you measured. Fasting, 120 mg/dL is in the CDC's prediabetes range (100 to 125). With diabetes, 120 is inside the 80 to 130 before-meal target. As a random reading, the CDC and NIDDK give no normal cutoff, only the 200 mg/dL diabetes line, and the NIDDK notes that test is for people with symptoms. One reading diagnoses nothing; take it to your doctor. **What are normal blood sugar levels by age?** The CDC and NIH pages we read give adults one normal range, not one per age. Age matters for diabetes targets: the NIDDK says goals may differ for adults over 65 who have had diabetes a long time. **What should blood sugar be with type 2 diabetes?** For most people who aren't pregnant, the CDC's target is 80 to 130 mg/dL before meals and below 180 mg/dL one to two hours after. The CDC's A1C goal for most people with diabetes is 7% or less. Your doctor may set a different target. **What blood sugar level is dangerous?** With diabetes, below 70 mg/dL is low, and the CDC's two pages on lows put "severe" at below 54 and below 55 mg/dL. On the high side, the CDC's emergency line is a reading that holds at 300 mg/dL or higher; our high blood sugar page has the full list. ## Related pages Blood sugar basics ### [Fasting blood sugar: three cutoffs and one blood draw](https://glucosebench.com/fasting-blood-sugar) The CDC's cutoffs for fasting blood sugar: 99 mg/dL or below is normal, 100 to 125 mg/dL is prediabetes, and 126 mg/dL or above is diabetes. Read more Blood sugar basics ### [Blood sugar after eating: the target with diabetes, and what the 2-hour lab test measures](https://glucosebench.com/blood-sugar-after-eating) If you have diabetes, the usual after-meal target is below 180 mg/dL: the CDC says one to two hours after a meal, and the NIH's diabetes institute (NIDDK) says about 2… Read more Blood sugar basics ### [Your A1C result, read against the NIH's cutoffs and the CDC's chart](https://glucosebench.com/a1c-levels) A normal A1C is below 5.7%. Read more Blood sugar basics ### [High blood sugar (hyperglycemia): the signs, and the readings that can't wait](https://glucosebench.com/high-blood-sugar) Hyperglycemia means high blood glucose; for most people with diabetes, the NIDDK says blood sugar is too high "when it is above 180 mg/dL." The usual signs are feeling… Read more Updated September 27, 2026. 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