Blood Sugar Converter (mg/dL ↔ mmol/L)
Convert glucose readings and see which range they fall in — test by test.
Ranges for this test
| Range | mg/dL | mmol/L |
|---|
Your values against the thresholds
| Time | Your value | Threshold | Result |
|---|
Converted readings
| # | mg/dL | mmol/L | Note |
|---|
For general information only, not medical advice. Consult a qualified health professional for advice about your situation.
About the Blood Sugar Converter (mg/dL ↔ mmol/L)
Glucose meters and labs report blood sugar in mg/dL (for example the US and India) or mmol/L (for example the UK, Canada and Australia). This converter switches between them for one reading or a whole pasted list, and tells you what a reading means for the test it came from: a fasting test, the 2-hour glucose tolerance test (OGTT), a random test, the pre- and after-meal goals for people with diabetes, and the hypoglycaemia levels — all from the American Diabetes Association’s 2026 Standards of Care.
A separate tab checks pregnancy glucose tests against the criteria clinics actually use: the IADPSG/WHO 2013 one-step 75 g test, the two-step 50 g screen followed by a 100 g test (Carpenter–Coustan or NDDG cut-offs), and India’s MoHFW single-step test (2-hour value ≥ 140 mg/dL). Everything runs in your browser.
How to use it
- Pick Convert a reading, Pregnancy test or Convert a list.
- For one reading: type the number, choose its unit and the kind of test. The conversion appears at once with the matching range and the rule behind it.
- For a pregnancy test: choose the criteria on your report and type each value (fasting, 1 hour, 2 hours, 3 hours). You see which values meet their thresholds and whether the criteria are met.
- For a list: paste readings from a meter, an app or a spreadsheet — one per line or separated by spaces. Times, dates and words are skipped. Copy the converted list or download it as CSV.
Examples
110 mg/dL · prediabetes range (impaired fasting glucose, 100–125 mg/dL)
11.7 mmol/L · diabetes range (200 mg/dL / 11.1 mmol/L or more), to be confirmed by a second test
58 mg/dL · level 1 hypoglycaemia (below 70 mg/dL, not below 54)
IADPSG: the 2-hour value meets 153 mg/dL → criteria for gestational diabetes met
137 mg/dL · below 140 mg/dL → test negative; repeat at 24–28 weeks if this was earlier
How the conversion works
Glucose has a molar mass of 180.156 g/mol, so 1 mmol/L = 18.0156 mg/dL. To go from mmol/L to mg/dL multiply by 18.0156; to go back, divide. mg/dL is shown without decimals and mmol/L with one, as meters and labs report them. With this factor the results match the paired values the ADA prints (126 mg/dL = 7.0 mmol/L, 200 = 11.1, 70 = 3.9). A threshold is always compared in the unit you entered, using the figure the guideline gives for that unit.
Checking the unit: a number below 35 entered as mg/dL, or 35 or more entered as mmol/L, almost always belongs to the other unit — 11.2 is a common mmol/L reading but would be a dangerous low in mg/dL. The converter then shows what the number means in both units and asks you to pick the unit on your meter or report; in the pregnancy tab it asks you to switch the unit before comparing. Switching the unit converts what you typed only when it looks like a reading in the previous unit, so correcting the unit never changes your number.
Ranges by test (ADA Standards of Care 2026)
- Fasting plasma glucose (no calories for at least 8 hours): normal below 100 mg/dL (5.6 mmol/L); prediabetes — impaired fasting glucose — 100–125 (5.6–6.9); diabetes 126 (7.0) or more.
- 2 hours after 75 g of glucose (OGTT): normal below 140 (7.8); prediabetes — impaired glucose tolerance — 140–199 (7.8–11.0); diabetes 200 (11.1) or more.
- Random: 200 mg/dL (11.1 mmol/L) or more with classic symptoms (thirst, passing a lot of urine, weight loss) meets a criterion for diabetes. Without symptoms, a random value is not diagnostic.
- Confirming diabetes: without unmistakably high glucose, a diagnosis needs two abnormal results — the same test twice or two different tests.
- Goals for many nonpregnant adults with diabetes: 80–130 mg/dL (4.4–7.2 mmol/L) before meals and a peak below 180 (10.0) 1–2 hours after the start of a meal. Your own goals may be different.
- Very high readings: people at risk of ketoacidosis (for example with type 1 diabetes) should check ketones when they are ill, have missed insulin or have symptoms, particularly above 200 mg/dL (11.1 mmol/L); vomiting, dehydration, drowsiness or confusion need urgent care. The converter adds this note to readings of 200 mg/dL or more for people with diabetes.
- Hypoglycaemia: level 1 below 70 mg/dL (3.9 mmol/L) down to 54 (3.0); level 2 below 54 (3.0); level 3 is any low that needs someone else’s help, whatever the number. These levels are defined for people with diabetes.
Pregnancy glucose tests
- IADPSG / WHO 2013 one-step 75 g OGTT (fasting, usually at 24–28 weeks): gestational diabetes if any one value meets or exceeds fasting 92 mg/dL (5.1 mmol/L), 1 hour 180 (10.0) or 2 hours 153 (8.5). WHO classes fasting 126 (7.0) or more, or 2 hours 200 (11.1) or more, as diabetes in pregnancy rather than gestational diabetes.
- Two-step (ACOG 2018): a non-fasting 50 g screen; a 1-hour value at or above the clinic’s cut-off (130, 135 or 140 mg/dL) leads to a fasting 100 g 3-hour OGTT. Gestational diabetes if at least two values meet or exceed the Carpenter–Coustan cut-offs 95 / 180 / 155 / 140 mg/dL (5.3 / 10.0 / 8.6 / 7.8 mmol/L), or the NDDG cut-offs 105 / 190 / 165 / 145 mg/dL.
- India — MoHFW 2018 (single step, DIPSI): 75 g of glucose dissolved in about 300 ml of water, fasting or not, whatever the time of the last meal; a plasma glucose of 140 mg/dL or more at 2 hours is gestational diabetes. The first test is at the first antenatal visit and, if negative, a second at 24–28 weeks, at least 4 weeks apart. MoHFW gives this cut-off in mg/dL only, so a mmol/L entry is converted before comparing.
Sources
- American Diabetes Association. 2. Diagnosis and Classification of Diabetes and 6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes—2026. Diabetes Care 49(Suppl 1)
- International Association of Diabetes and Pregnancy Study Groups. Recommendations on the diagnosis and classification of hyperglycemia in pregnancy. Diabetes Care 33(3):676-82 (Table 1)
- WHO. Recommendations on antenatal care for a positive pregnancy experience, recommendation B.1.4 (WHO 2013 criteria)
- ACOG Practice Bulletin 190, Gestational Diabetes Mellitus (2018), as summarised in Kaymak D, Ozgu-Erdinc AS. World J Diabetes 2025;16(10):111309; NDDG and Carpenter–Coustan cut-offs as tabulated in Bakshi RK et al. Indian J Community Med 2023;48(6):828-34
- Ministry of Health & Family Welfare, Government of India. Diagnosis & Management of Gestational Diabetes Mellitus: Technical and Operational Guidelines, sections 3 and 4.4–4.5
Limitations
- Diagnostic thresholds apply to laboratory plasma glucose. Home meters are fine for day-to-day checks, but a diagnosis of diabetes is made on lab tests.
- The interpretation is for adults who are not pregnant, except in the pregnancy tab. Children and people with other conditions may have different targets.
- Readings must be 10–1,500 mg/dL (0.6–83.3 mmol/L); lists of up to 2,000 values are converted.
- It cannot know which unit your meter uses. Numbers that fit both units are flagged, but always choose the unit printed on your meter or report.
- It cannot tell whether a test was done properly (true fasting, the right glucose load, the right timing) — that changes what a number means.
Privacy
Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot.
Frequently asked questions
How do I convert mmol/L to mg/dL?
Multiply by 18 (exactly 18.0156). For example 7.0 mmol/L × 18.0156 = 126 mg/dL. To convert mg/dL to mmol/L, divide by 18.0156: 100 mg/dL ÷ 18.0156 = 5.6 mmol/L.
What is a normal fasting blood sugar?
Below 100 mg/dL (5.6 mmol/L), according to the ADA. 100–125 mg/dL (5.6–6.9 mmol/L) is prediabetes and 126 mg/dL (7.0 mmol/L) or more is in the diabetes range, which needs confirming with a second test.
What blood sugar level is too low?
The ADA calls a reading below 70 mg/dL (3.9 mmol/L) level 1 hypoglycaemia and below 54 mg/dL (3.0 mmol/L) level 2, which needs immediate treatment. Anyone who is confused or cannot swallow needs urgent help.
What 2-hour value means gestational diabetes in India?
Under the MoHFW 2018 guideline, a plasma glucose of 140 mg/dL or more two hours after drinking 75 g of glucose — fasting or not — means gestational diabetes. The test is done at the first antenatal visit and again at 24–28 weeks if the first is negative.
Why do two converters give slightly different results?
Some use 18 and others 18.0156 (the molar-mass value used here), and they round differently. The difference is under 0.1% — for example 7.8 mmol/L is 140.4 or 140.5 mg/dL — so for anything a meter can show (up to 600 mg/dL or 33.3 mmol/L) a whole-number result differs by 1 at most.