mg/dL to mmol/L Blood Sugar Converter + Full Chart

Readings people look up most

These are common mg/dL values converted to mmol/L, with what each one means for an adult.

mg/dL	mmol/L	What it means
70	3.9	Normal fasting range (CDC)
90	5.0	Normal fasting range (CDC)
100	5.6	Prediabetes range if fasting (CDC)
110	6.1	Prediabetes range if fasting (CDC)
126	7.0	Diabetes range if fasting (CDC); within the ADA before-meal target
140	7.8	Above the ADA before-meal target, within the after-meal target
160	8.9	Above the ADA before-meal target, within the after-meal target
180	10.0	High: above the ADA after-meal target
200	11.1	High: above the ADA after-meal target
250	13.9	Very high

mg/dL to mmol/L chart for every value

Find the tens on the left and the last digit along the top. Example: 126 mg/dL is row 120, column 6, which gives 7.0 mmol/L. Print this page to keep the chart next to your meter.

mg/dL to mmol/L, every value (row = tens, column = last digit)
mg/dL	0	1	2	3	4	5	6	7	8	9
20	1.1	1.2	1.2	1.3	1.3	1.4	1.4	1.5	1.6	1.6
30	1.7	1.7	1.8	1.8	1.9	1.9	2.0	2.1	2.1	2.2
40	2.2	2.3	2.3	2.4	2.4	2.5	2.6	2.6	2.7	2.7
50	2.8	2.8	2.9	2.9	3.0	3.1	3.1	3.2	3.2	3.3
60	3.3	3.4	3.4	3.5	3.6	3.6	3.7	3.7	3.8	3.8
70	3.9	3.9	4.0	4.1	4.1	4.2	4.2	4.3	4.3	4.4
80	4.4	4.5	4.6	4.6	4.7	4.7	4.8	4.8	4.9	4.9
90	5.0	5.1	5.1	5.2	5.2	5.3	5.3	5.4	5.4	5.5
100	5.6	5.6	5.7	5.7	5.8	5.8	5.9	5.9	6.0	6.1
110	6.1	6.2	6.2	6.3	6.3	6.4	6.4	6.5	6.6	6.6
120	6.7	6.7	6.8	6.8	6.9	6.9	7.0	7.1	7.1	7.2
130	7.2	7.3	7.3	7.4	7.4	7.5	7.6	7.6	7.7	7.7
140	7.8	7.8	7.9	7.9	8.0	8.1	8.1	8.2	8.2	8.3
150	8.3	8.4	8.4	8.5	8.6	8.6	8.7	8.7	8.8	8.8
160	8.9	8.9	9.0	9.1	9.1	9.2	9.2	9.3	9.3	9.4
170	9.4	9.5	9.6	9.6	9.7	9.7	9.8	9.8	9.9	9.9
180	10.0	10.1	10.1	10.2	10.2	10.3	10.3	10.4	10.4	10.5
190	10.6	10.6	10.7	10.7	10.8	10.8	10.9	10.9	11.0	11.1
200	11.1	11.2	11.2	11.3	11.3	11.4	11.4	11.5	11.6	11.6
210	11.7	11.7	11.8	11.8	11.9	11.9	12.0	12.1	12.1	12.2
220	12.2	12.3	12.3	12.4	12.4	12.5	12.6	12.6	12.7	12.7
230	12.8	12.8	12.9	12.9	13.0	13.1	13.1	13.2	13.2	13.3
240	13.3	13.4	13.4	13.5	13.6	13.6	13.7	13.7	13.8	13.8
250	13.9	13.9	14.0	14.1	14.1	14.2	14.2	14.3	14.3	14.4
260	14.4	14.5	14.6	14.6	14.7	14.7	14.8	14.8	14.9	14.9
270	15.0	15.1	15.1	15.2	15.2	15.3	15.3	15.4	15.4	15.5
280	15.6	15.6	15.7	15.7	15.8	15.8	15.9	15.9	16.0	16.1
290	16.1	16.2	16.2	16.3	16.3	16.4	16.4	16.5	16.6	16.6
300	16.7	16.7	16.8	16.8	16.9	16.9	17.0	17.1	17.1	17.2
310	17.2	17.3	17.3	17.4	17.4	17.5	17.6	17.6	17.7	17.7
320	17.8	17.8	17.9	17.9	18.0	18.1	18.1	18.2	18.2	18.3
330	18.3	18.4	18.4	18.5	18.6	18.6	18.7	18.7	18.8	18.8
340	18.9	18.9	19.0	19.1	19.1	19.2	19.2	19.3	19.3	19.4
350	19.4	19.5	19.6	19.6	19.7	19.7	19.8	19.8	19.9	19.9
360	20.0	20.1	20.1	20.2	20.2	20.3	20.3	20.4	20.4	20.5
370	20.6	20.6	20.7	20.7	20.8	20.8	20.9	20.9	21.0	21.1
380	21.1	21.2	21.2	21.3	21.3	21.4	21.4	21.5	21.6	21.6
390	21.7	21.7	21.8	21.8	21.9	21.9	22.0	22.1	22.1	22.2

mmol/L to mg/dL, the other way

mmol/L to mg/dL
mmol/L	mg/dL
2.0	36
2.5	45
3.0	54
3.5	63
4.0	72
4.5	81
5.0	90
5.5	99
6.0	108
6.5	117
7.0	126
7.5	135
8.0	144
8.5	153
9.0	162
9.5	171
10.0	180
10.5	189
11.0	198
11.5	207
12.0	216
12.5	225
13.0	234
13.5	243
14.0	252
14.5	261
15.0	270
15.5	279
16.0	288
16.5	297
17.0	306
17.5	315
18.0	324
18.5	333
19.0	342
19.5	351
20.0	360
22.0	396
25.0	450
28.0	504
30.0	540
33.3	599

What the number means

The converter shows a short note under the result. It uses these published ranges for adults:

Reading	mg/dL	mmol/L
Very low (ADA level 2)	below 54	below 3.0
Low (ADA level 1)	54–69	3.0–3.8
Normal fasting (CDC)	99 or below	5.5 or below
Fasting, prediabetes range (CDC)	100–125	5.6–6.9
Fasting, diabetes range (CDC)	126 or above	7.0 or above
Before-meal target with diabetes (ADA)	80–130	4.4–7.2
1–2 hours after a meal, target with diabetes (ADA)	below 180	below 10.0

Fasting ranges only apply to a reading taken after at least 8 hours without food. A single meter reading cannot diagnose anything, and your own targets may differ. Ask your doctor what is right for you. More detail is in the blood sugar levels chart.

Using a different unit from your doctor?

Readings from a meter set to the wrong unit look very strange: 110 where you expect 6.1, or 6.1 where you expect 110. If you move countries, read a guide written for another country or get a new meter, check which unit it uses. On many meters the unit is fixed by the manufacturer for the country where it is sold.

Make a log in your unitChoose mmol/L or mg/dL and print a log that fits how you test.

Questions

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

Divide by 18. For example, 140 mg/dL ÷ 18 = 7.8 mmol/L.

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

Multiply by 18. For example, 6.5 mmol/L × 18 = 117 mg/dL. There is also a separate mmol/L to mg/dL converter.

What is 100 mg/dL in mmol/L?

100 mg/dL is 5.6 mmol/L. As a fasting reading, the CDC puts 100–125 mg/dL in the prediabetes range.

Why 18?

One mmol of glucose weighs about 180 mg, and mg/dL counts per tenth of a litre, so 1 mmol/L is about 18 mg/dL. The exact factor is 18.016; the difference is too small to matter for meter readings.

Which countries use mmol/L and which use mg/dL?

The United States and several other countries use mg/dL. The UK, most of Europe, Canada and Australia use mmol/L. Use the same unit your meter shows.

Does this work for HbA1c?

No. HbA1c is measured in % or mmol/mol and needs a different formula. Use the A1C calculator for that. This converter is for blood glucose readings only.

mg/dL to mmol/L converter and chart