Free reference

Blood sugar by number

Every glucose value from 40 to 400 mg/dL and 2.2 to 22.2 mmol/L, each on its own page against the CGM target range and the ADA goals, with the sources.

mg/dL (US)

Very low 40–53

Low 54–69

In range 70–180

High 181–250

Very high 251–400

mmol/L (UK, Canada, most of Europe)

Very low 2.2–2.9

Low 3.0–3.8

In range 3.9–10.0

3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
6.0
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
7.0
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
8.0
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
9.0
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
10.0

High 10.1–13.9

10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
11.0
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
12.0
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
12.9
13.0
13.1
13.2
13.3
13.4
13.5
13.6
13.7
13.8
13.9

Very high 14.0–22.2

Bands from the 2019 international consensus on time in range, which publishes them in both units; the mmol/L bands use its figures, so 181 mg/dL (10.05 mmol/L) and 10.1 mmol/L both read as high. To convert any value, use the mg/dL ↔ mmol/L converter.