Blood Sugar Level Chart: Easy Guide to Healthy Ranges

Understanding your blood sugar level chart can help you know whether your glucose is in a healthy range, whether you may be at risk for diabetes, and what steps to take next. Blood sugar, also called blood glucose, is the main source of energy for your body. Keeping it within a healthy range is important for long-term health, energy, and overall well-being.

This guide explains normal blood sugar ranges, what test results mean, and how to use a blood sugar level chart in a simple, practical way.

What Is Blood Sugar?

Blood sugar is the amount of glucose in your blood. Glucose comes from the food you eat, especially carbohydrates like bread, rice, fruit, and sweets. Your body uses insulin to help move glucose from your blood into your cells for energy.

When blood sugar stays too high or drops too low, it can cause health problems. Over time, high blood sugar can increase the risk of diabetes, heart disease, nerve damage, and other complications.

To see how glucose is used in a diabetes management device, you can also read our guide to the Dario glucose meter.

Blood Sugar Level Chart

Here is a general blood sugar level chart for adults. These numbers are commonly used, but targets may vary depending on age, health condition, and whether you have diabetes.

Blood Sugar Level Chart for Non-Diabetics

Test Type	Normal Range	Prediabetes	Diabetes
Fasting blood sugar	70–99 mg/dL	100–125 mg/dL	126 mg/dL or higher
2 hours after eating	Less than 140 mg/dL	140–199 mg/dL	200 mg/dL or higher
A1C	Below 5.7%	5.7%–6.4%	6.5% or higher

Blood Sugar Targets for People with Diabetes

Test Type	Common Target Range
Before meals	80–130 mg/dL
1–2 hours after meals	Less than 180 mg/dL
Bedtime	Around 100–140 mg/dL, depending on the person

These are general targets. Your doctor may recommend different goals based on your medication, age, pregnancy, or other medical conditions.

For official diabetes guidance, the Centers for Disease Control and Prevention explains blood sugar management in detail.

What Do the Numbers Mean?

Fasting Blood Sugar

Fasting blood sugar is measured after not eating for at least 8 hours, usually in the morning before breakfast.

• 70–99 mg/dL: Normal
• 100–125 mg/dL: Prediabetes
• 126 mg/dL or higher: Possible diabetes

A fasting result is often one of the first tests used to check blood sugar health. A blood sugar level chart can make it easier to compare your result with the usual reference ranges.

Blood Sugar After Eating

Blood sugar naturally rises after a meal, but it should not stay high for too long.

• Less than 140 mg/dL after 2 hours: Normal
• 140–199 mg/dL: Prediabetes
• 200 mg/dL or higher: Possible diabetes

If your blood sugar spikes too much after meals, it may suggest your body is having trouble processing glucose efficiently. Checking results against a blood sugar level chart can help you notice patterns over time.

A1C Test

The A1C test shows your average blood sugar over the past 2 to 3 months.

• Below 5.7%: Normal
• 5.7% to 6.4%: Prediabetes
• 6.5% or higher: Diabetes

A1C is useful because it gives a long-term view, not just a single reading. When paired with a blood sugar level chart, it helps you understand both daily numbers and longer-term trends.

Why Blood Sugar Levels Matter

Keeping blood sugar in a healthy range helps protect your body from both short-term and long-term problems.

High Blood Sugar Risks

High blood sugar can lead to:

• Increased thirst
• Frequent urination
• Fatigue
• Blurred vision
• Headaches
• Weight loss in some cases

If blood sugar stays high over time, it can damage blood vessels, nerves, kidneys, eyes, and the heart.

Low Blood Sugar Risks

Low blood sugar, also called hypoglycemia, can cause:

• Shaking
• Sweating
• Dizziness
• Hunger
• Confusion
• Fast heartbeat

Severe low blood sugar can be dangerous and may require immediate treatment. A blood sugar level chart is helpful, but symptoms matter too, especially when your numbers change quickly.

Common Questions About Blood Sugar Ranges

What Is a Normal Blood Sugar Level in the Morning?

For most adults without diabetes, a normal fasting morning blood sugar is 70 to 99 mg/dL.

For people with diabetes, morning fasting targets are often set higher, usually around 80 to 130 mg/dL, depending on the treatment plan.

What Is a Healthy Blood Sugar Level After a Meal?

A healthy blood sugar level 2 hours after eating is usually less than 140 mg/dL for people without diabetes. For people with diabetes, the common goal is less than 180 mg/dL.

What Blood Sugar Level Is Dangerous?

Blood sugar can become dangerous when it is very low or very high.

• Below 70 mg/dL: Low blood sugar
• Above 180 mg/dL after meals repeatedly: May suggest poor control in diabetes
• Above 200 mg/dL: Possible diabetes if confirmed
• Very high readings, especially with symptoms: Need prompt medical attention

If your blood sugar is extremely high and you feel very ill, confused, dehydrated, or short of breath, seek emergency care.

Can Blood Sugar Change Throughout the Day?

Yes. Blood sugar naturally changes based on:

• What you eat
• How active you are
• Stress levels
• Sleep
• Illness
• Medications

This is why a single reading does not always tell the full story. A blood sugar level chart helps you compare readings at different times of day and identify trends.

Factors That Affect Blood Sugar

Several everyday factors can cause blood sugar to rise or fall:

Food Choices

Carbohydrates have the biggest effect on blood sugar. Large portions of sugary or refined foods can cause spikes.

Physical Activity

Exercise helps muscles use glucose, which can lower blood sugar. Even a short walk after meals may help some people keep readings closer to their target range on a blood sugar level chart.

Stress

Stress hormones can raise blood sugar, even if you are not eating more.

Illness

When your body is fighting an infection or sickness, blood sugar may become harder to control.

Medications

Some medications, including insulin and certain diabetes drugs, can lower blood sugar. Others may raise it.

How to Check Blood Sugar

There are a few common ways to monitor blood sugar:

Fingerstick Glucose Meter

This is a small device that uses a drop of blood from your fingertip. It gives a quick reading and is often used at home.

Continuous Glucose Monitor (CGM)

A CGM tracks glucose levels throughout the day and night. It can help people with diabetes see patterns and trends.

Laboratory Tests

Doctors may order fasting glucose or A1C tests to evaluate long-term blood sugar control.

Some people compare home results with the ranges in a blood sugar level chart and then bring those notes to appointments for a clearer conversation with their healthcare team.

Tips for Keeping Blood Sugar in a Healthy Range

If you want to support healthy blood sugar levels, these habits can help:

• Eat balanced meals with protein, fiber, and healthy fats
• Limit sugary drinks and highly processed foods
• Choose whole grains, vegetables, and fruit in reasonable portions
• Stay physically active
• Drink enough water
• Get enough sleep
• Manage stress
• Take prescribed medication as directed
• Check blood sugar regularly if advised by your doctor

Small changes can make a big difference over time. If your numbers are trending upward, reviewing a blood sugar level chart can help you and your doctor decide what adjustment may be needed.

Blood Sugar Levels by Age

Blood sugar goals can vary by age and health status.

Children and Teens

Healthy ranges are similar, but doctors may adjust targets based on growth, activity, and medical needs.

Adults

Adults without diabetes generally follow the standard normal ranges in the chart above.

Older Adults

Older adults may have different goals to reduce the risk of low blood sugar and other complications.

Because individual needs vary, it is best to follow the target range recommended by a healthcare provider and use a blood sugar level chart as a general reference rather than a fixed rule.

When to Talk to a Doctor

You should speak with a doctor if:

• Your fasting blood sugar is repeatedly over 100 mg/dL
• Your blood sugar after meals is often high
• You have symptoms of high or low blood sugar
• You have a family history of diabetes
• You are overweight or have other risk factors
• Your A1C is in the prediabetes or diabetes range

Early testing and treatment can help prevent complications. If you need a broader look at the blood-pressure side of metabolic health, you may also find our Blood Pressure Chart helpful.

Blood Sugar Chart at a Glance

Here is a quick summary of the most common healthy blood sugar ranges:

• Fasting blood sugar: 70–99 mg/dL
• 2 hours after eating: Less than 140 mg/dL
• A1C: Below 5.7%
• Prediabetes fasting range: 100–125 mg/dL
• Diabetes fasting range: 126 mg/dL or higher

For people with diabetes, common treatment targets are:

• Before meals: 80–130 mg/dL
• 1–2 hours after meals: Less than 180 mg/dL

A blood sugar level chart makes these ranges easier to remember when you are checking numbers at home or reviewing lab results with your clinician.

Final Thoughts

A blood sugar level chart is a simple but powerful tool for understanding your health. Whether you are checking for normal blood sugar, prediabetes, or diabetes, the chart gives you a clear starting point. Fasting blood sugar, post-meal readings, and A1C tests all help paint a fuller picture of how your body handles glucose.

By knowing the healthy ranges and watching for warning signs, you can take better control of your blood sugar and support long-term health.

For more background on how people manage glucose over time, the blood sugar level chart remains one of the easiest ways to interpret results quickly and consistently.