How do I convert blood sugar from mg/dL to mmol/L?

To convert blood sugar from mg/dL to mmol/L, divide by 18 (or multiply by 0.0555). For example, 126 mg/dL divided by 18 equals 7.0 mmol/L. To convert from mmol/L to mg/dL, multiply by 18. For example, 5.5 mmol/L multiplied by 18 equals 99 mg/dL.

What blood sugar level mg/dL indicates prediabetes?

Prediabetes is indicated by a fasting blood sugar of 100–125 mg/dL (5.6–6.9 mmol/L), or a post-meal blood sugar of 140–199 mg/dL (7.8–11.0 mmol/L) two hours after eating. These ranges indicate impaired glucose regulation and a significantly elevated risk of developing type 2 diabetes if lifestyle changes are not made.

Why are mg/dL and mmol/L both used for blood sugar?

mg/dL (milligrams per deciliter) is used in the United States, India, and many other countries. mmol/L (millimoles per litre) is the international standard used in the UK, Canada, Australia, and Europe. Both measure blood glucose concentration but use different units. This converter instantly switches between both so you can compare readings from different countries or devices.

Blood Sugar Converter – mg/dL to mmol/L Calculator | DietDekho

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Convert blood sugar between mg/dL and mmol/L in seconds. Check if your blood glucose reading is normal, prediabetic or diabetic — with expert Indian diet advice, completely free.

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Blood Sugar (mg/dL)* mg/dL

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Value ÷ 18

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What Is Blood Sugar?

Understanding Blood Sugar mg/dL

Blood sugar (blood glucose) is the amount of glucose present in your blood at any given time. Glucose is your body's primary energy source, derived from the carbohydrates you eat. Your pancreas regulates blood glucose levels by releasing insulin (to lower glucose) and glucagon (to raise glucose), keeping levels within a narrow, healthy range throughout the day.

Two units are used globally to report blood sugar — mg/dL (milligrams per decilitre), used in India, the USA, Germany and several other countries, and mmol/L (millimoles per litre), the international standard used in the UK, Canada, Australia and Europe. The same blood glucose reading expressed in one unit simply needs to be divided or multiplied by 18 to convert to the other.

The Formula

Conversion Formula

How to Convert mg/dL to mmol/L

Blood Sugar Conversion Formulas

mg/dL → mmol/L

mmol/L = mg/dL ÷ 18 (or × 0.0555)
Example: 126 mg/dL ÷ 18 = 7.0 mmol/L

mmol/L → mg/dL

mg/dL = mmol/L × 18
Example: 5.5 mmol/L × 18 = 99 mg/dL

Normal Ranges

Blood Sugar Chart

Blood Sugar mg/dL Normal Range Chart

The following table shows the clinically accepted blood sugar ranges for non-diabetic adults, prediabetes, and diabetes — in both mg/dL and mmol/L — across the three main test types.

Fasting Blood Sugar (after 8+ hours without food)

Status	mg/dL	mmol/L	Classification
Below 70	Below 70 mg/dL	Below 3.9	Low (Hypoglycaemia)
Normal	70 – 100 mg/dL	3.9 – 5.6	Normal ✓
Prediabetes	100 – 125 mg/dL	5.6 – 6.9	Prediabetes
Diabetes	126 mg/dL or above	7.0 or above	Diabetes

Post-Meal Blood Sugar (2 hours after eating)

Status	mg/dL	mmol/L	Classification
Normal	Below 140 mg/dL	Below 7.8	Normal ✓
Prediabetes	140 – 199 mg/dL	7.8 – 11.0	Prediabetes
Diabetes	200 mg/dL or above	11.1 or above	Diabetes

Random Blood Sugar (any time of day)

Status	mg/dL	mmol/L	Classification
Normal	Below 140 mg/dL	Below 7.8	Normal ✓
Concern	140 – 199 mg/dL	7.8 – 11.0	Monitor Closely
Diabetes (with symptoms)	200 mg/dL or above	11.1 or above	Diabetes

Quick Reference

Conversion Chart

Blood Sugar mg/dL to mmol/L Conversion Chart

Use this quick reference chart to look up common blood glucose values in both units without a calculator.

mg/dL	mmol/L	Status (Fasting)	Status (Post-Meal)
54	3.0	Very Low	Very Low
72	4.0	Normal	Normal
90	5.0	Normal	Normal
99	5.5	Normal	Normal
108	6.0	Prediabetes	Normal
126	7.0	Diabetes	Normal
140	7.8	Diabetes	Prediabetes
180	10.0	Diabetes	Prediabetes
200	11.1	Diabetes	Diabetes
270	15.0	Diabetes (High)	Diabetes (High)

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mg/dL — Used in India

India, the USA, Germany, Japan, and several other countries use mg/dL for blood glucose reporting. Most glucometers sold in India display values in mg/dL by default.

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mmol/L — International Standard

The UK, Canada, Australia, and most of Europe use mmol/L as the official unit. If you receive a report from an international lab, this converter helps you interpret the value in mg/dL.

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HbA1c & Average Glucose

HbA1c measures average blood glucose over 3 months. An HbA1c of 5.7% = ~117 mg/dL, 6.0% = ~126 mg/dL, 6.5% = ~140 mg/dL, 7.0% = ~154 mg/dL, and 8.0% = ~183 mg/dL.

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Prediabetes — Act Now

Prediabetes (fasting 100–125 mg/dL) is fully reversible with lifestyle changes. Research shows that losing 5–7% body weight and walking 150 min/week reduces progression to type 2 diabetes by up to 58%.

Indian Diet Tips

Manage Blood Sugar

How to Manage Blood Sugar mg/dL — Indian Diet Guide

1
Switch from white rice to millets or brown rice — millets like jowar, bajra, and ragi have a significantly lower glycaemic index than white rice or maida. A simple swap at one meal per day can meaningfully reduce post-meal blood sugar (mg/dL) over 4–8 weeks. Portion control of all grain foods is equally important regardless of type.
2
Eat dal at every meal — lentils (moong, masoor, chana, toor dal) are the most underrated blood sugar–controlling foods in Indian cuisine. Their combination of protein, fibre, and slow-digesting carbohydrates significantly blunts the post-meal glucose spike. Studies show eating dal before rice at a meal reduces post-meal mg/dL by 20–30%.
3
Walk 15–20 minutes after every main meal — post-meal walking is one of the most powerful, evidence-based tools for reducing post-meal blood sugar (mg/dL). Muscle contraction during walking uses glucose without requiring insulin. Even a slow 15-minute walk after lunch or dinner can reduce 2-hour post-meal glucose by 25–30 mg/dL in most people.
4
Include karela and methi seeds regularly — bitter gourd (karela) contains polypeptide-p, a plant insulin analogue, and charantin, which collectively lower blood glucose. Fenugreek seeds (methi) contain soluble fibre (galactomannan) that slows carbohydrate absorption. Soaking 1 tsp methi seeds overnight and eating them on an empty stomach is a validated Indian home remedy for fasting blood sugar reduction.
5
Avoid sugary drinks entirely — including fruit juices — cold drinks, packaged juices, sweetened chai, and even "natural" fruit juices cause rapid blood sugar spikes because they deliver large quantities of sugar without the fibre that slows absorption. Replace with plain water, buttermilk (chach), coconut water in moderation, or unsweetened green tea with ginger.
6
Eat your meals in the right order — fibre and protein first — eating a salad or dal first, followed by sabzi, and then rotis or rice last significantly reduces the glycaemic impact of the meal. This "food sequencing" technique can reduce post-meal blood sugar by 30–40 mg/dL without changing what you eat — only the order in which you eat it.
7
Sleep 7–8 hours consistently — sleep deprivation of even one night raises fasting blood glucose, increases cortisol, and worsens insulin resistance. Consistently poor sleep is a significant but often overlooked driver of elevated blood sugar mg/dL in Indians. Prioritise a fixed sleep schedule with lights out before 11 PM for measurable blood sugar improvement.

FAQs

Common Questions About Blood Sugar mg/dL

Answers from DietDekho's registered dietitians on the most frequently asked questions about blood sugar conversion, normal mg/dL ranges, and managing blood glucose through diet.

What is a normal blood sugar level in mg/dL? +

A normal fasting blood sugar (after 8+ hours without food) is 70–100 mg/dL (3.9–5.6 mmol/L). A normal post-meal blood sugar (2 hours after eating) is below 140 mg/dL (7.8 mmol/L). A random blood sugar (any time of day) below 140 mg/dL is generally considered normal for non-diabetic adults. Values consistently above these thresholds warrant consultation with a doctor and dietitian.

How do I convert mg/dL to mmol/L? +

To convert blood sugar from mg/dL to mmol/L, divide by 18 (or multiply by 0.0555). For example, 126 mg/dL ÷ 18 = 7.0 mmol/L. To convert from mmol/L to mg/dL, multiply by 18. For example, 5.5 mmol/L × 18 = 99 mg/dL. This converter handles the calculation instantly — just enter your value and select the direction.

What blood sugar mg/dL level indicates prediabetes? +

Prediabetes is indicated by a fasting blood sugar of 100–125 mg/dL (5.6–6.9 mmol/L), or a post-meal blood sugar of 140–199 mg/dL (7.8–11.0 mmol/L) two hours after eating. These readings indicate impaired glucose regulation and significantly elevated risk of developing type 2 diabetes. Importantly, prediabetes is fully reversible with lifestyle changes — losing 5–7% body weight and 150 minutes of weekly walking reduces progression to diabetes by up to 58%.

What blood sugar mg/dL level indicates diabetes? +

Diabetes is indicated by a fasting blood sugar of 126 mg/dL (7.0 mmol/L) or above, a post-meal blood sugar of 200 mg/dL (11.1 mmol/L) or above two hours after eating, or a random blood sugar of 200 mg/dL or above with diabetes symptoms such as excessive thirst, frequent urination, or unexplained weight loss. An HbA1c of 6.5% or above also confirms diabetes. A single elevated reading must be confirmed by repeat testing before diagnosis.

Why does India use mg/dL while other countries use mmol/L? +

mg/dL (milligrams per decilitre) is used in India, the USA, Germany, Japan, and several other countries — it represents the weight of glucose per volume of blood. mmol/L (millimoles per litre) is the WHO international standard used in the UK, Canada, Australia, and Europe — it represents the molecular concentration of glucose. Both measure exactly the same thing, just in different units. The conversion factor is always 18: mg/dL ÷ 18 = mmol/L.

What Indian foods help reduce fasting blood sugar mg/dL? +

Indian foods clinically shown to help manage blood sugar include karela (bitter gourd), methi seeds (fenugreek), amla (Indian gooseberry), all varieties of dal, millets (jowar, bajra, ragi), barley, cinnamon (dalchini), and green leafy vegetables. Avoiding refined carbohydrates (maida, white rice in excess), sugary drinks, and packaged snacks is equally critical. A 15–20 minute walk after meals is one of the most effective non-dietary interventions for post-meal blood sugar control.

Medical Disclaimer: Blood sugar conversion results and classification provided by DietDekho's Blood Sugar Converter are for general informational and educational purposes only. They do not constitute medical advice, diagnosis, or treatment. A single blood sugar reading is not sufficient for diagnosis — always consult a qualified doctor or registered dietitian for proper evaluation, diagnosis, and management of blood glucose levels and diabetes.