Normal Blood Sugar Levels: Chart and What the Numbers Mean
Chikitshalaya Medical Team•15 Feb 2026•3 min read
"Is my sugar normal?" is one of the most common questions people ask after a blood test — and the answer depends on when the sample was taken and which test was used. A single number out of context can cause needless worry or false reassurance. This guide lays out the normal ranges clearly, what counts as prediabetes or diabetes, and how targets shift by age and situation. It pairs with our complete diabetes guide.
How blood sugar is measured
Blood sugar (glucose) is usually measured in mg/dL in India. The common tests are:
Fasting blood sugar (FBS): after at least 8 hours without food
Post-meal / postprandial (PPBS): typically 2 hours after eating
Random blood sugar (RBS): at any time
HbA1c: reflects your average blood sugar over about 2-3 months, no fasting needed
Each answers a slightly different question, which is why doctors often use more than one.
Normal blood sugar levels chart
Measurement
Normal
Prediabetes
Diabetes
Fasting (mg/dL)
Below 100
100-125
126 or above
2-hr post-meal (mg/dL)
Below 140
140-199
200 or above
HbA1c (%)
Below 5.7
5.7-6.4
6.5 or above
Random (mg/dL)
Below 140
140-199
200+ with symptoms
A diagnosis of diabetes is usually confirmed with a repeat test rather than a single reading, unless sugar is very high with clear symptoms.
Targets by age and situation
The diagnostic cut-offs above are broadly the same for all adults, but day-to-day targets for people who already have diabetes are individualised.
Adults
Most non-pregnant adults aim for fasting and pre-meal values in a healthy range with an HbA1c target their doctor sets (often around 7% for many people with diabetes, but it varies).
Older adults
Targets are often relaxed a little for older or frail adults, because the risk of dangerous low blood sugar (hypoglycaemia) can outweigh the benefit of very tight control.
Children
Children with diabetes have age-specific targets managed by paediatric specialists.
Pregnancy
Pregnancy has its own stricter targets to protect mother and baby — see our guide to gestational diabetes.
What the numbers mean
Normal: keep doing what you're doing; re-screen periodically if you have risk factors.
Prediabetes: a warning stage and a real opportunity — lifestyle change now can prevent diabetes. Read how to reverse prediabetes.
Diabetes: needs proper diagnosis and a management plan with your doctor.
When and how to test
If you have no symptoms but carry risk factors (family history, excess weight, high blood pressure, sedentary life, South Asian ancestry), periodic screening is wise even when you feel fine. If you have symptoms of high blood sugar — increased thirst, frequent urination, fatigue, blurred vision — test sooner. People who already have diabetes follow a testing schedule their doctor sets, often combining home glucometer checks with periodic HbA1c.
What can affect a single reading
A one-off number can be skewed by:
Recent food or drink (for a "fasting" test that wasn't truly fasting)
Illness, infection or stress
Certain medicines, including steroids
Poor glucometer technique or strips
Intense exercise just before testing
This is why HbA1c, which averages months of data, is so useful, and why doctors look at trends rather than a single value.
How to keep your levels in range
The fundamentals are the same whether you're preventing diabetes or managing it: balanced, fibre-rich meals with controlled carbs, regular movement (especially after meals), healthy weight, good sleep and stress management. Our guides on the diabetes diet chart and controlling blood sugar naturally go into the practical detail.
When to see a doctor
See a doctor to interpret any abnormal result, before changing diabetes medication, or urgently if you have very low readings with confusion/shakiness or very high readings with vomiting, drowsiness or breathlessness. Numbers guide treatment, but only a doctor can put them in the context of your overall health.
Conclusion
"Normal" blood sugar depends on the test and the timing: under 100 fasting, under 140 two hours after eating, and an HbA1c under 5.7%. Use the chart to understand where you stand, treat a prediabetes result as a chance to act, and let your doctor interpret anything abnormal rather than self-diagnosing from one reading.
This article is for general education and is not a substitute for professional medical advice. Please consult a qualified doctor for diagnosis and treatment tailored to you.
Frequently Asked Questions
What is a normal fasting blood sugar level?+
For most adults, a normal fasting blood sugar is below 100 mg/dL. A reading of 100-125 mg/dL suggests prediabetes, and 126 mg/dL or higher on repeat testing indicates diabetes. 'Fasting' means at least 8 hours without food.
What should blood sugar be 2 hours after eating?+
In people without diabetes, blood sugar 2 hours after a meal is usually below 140 mg/dL. A value of 140-199 mg/dL suggests prediabetes, and 200 mg/dL or higher points to diabetes. People with diabetes are often given individual post-meal targets by their doctor.
Does normal blood sugar change with age?+
The diagnostic cut-offs for diabetes are the same across adult ages, but targets are often relaxed slightly for older adults to reduce the risk of dangerous low blood sugar. Children and pregnant women have their own specific targets set by their doctors.
What is a dangerous blood sugar level?+
Very low blood sugar (below about 70 mg/dL) can cause shakiness, confusion and, if severe, loss of consciousness, and needs immediate sugar intake. Very high levels (e.g. above 250-300 mg/dL with symptoms) can be dangerous too. Seek medical help for severe or persistent extremes.