Glucose Units (mg/dL and mmol/L)

GlycemicGPT can show your glucose in either mg/dL or mmol/L. This is a personal display preference -- pick whichever your country and your care team use. Changing it updates the numbers you read everywhere in the app; it does not change anything about your data or how the app keeps you safe.

Switching units is a display choice, not a data change. Your glucose history, your alerts, and every safety check work exactly the same in either unit. You're only changing the numbers you read on the screen.

Picking your unit (mg/dL vs mmol/L)

Both units measure the same thing -- they're just two scales:

• mg/dL is used in the United States and a few other countries. Values are whole numbers (for example, 120).
• mmol/L is used in most of the rest of the world. Values have one decimal place (for example, 6.7).

Choose the one you and your healthcare provider already use. If you're not sure, match whatever your CGM or meter shows.

On the web dashboard

Go to Settings → Profile → Glucose Display Unit and pick mg/dL or mmol/L. The dashboard updates right away -- your current glucose, charts, alerts, and daily briefs all switch to the unit you chose.

Your glucose data is always stored in mg/dL; this only changes how it is displayed.

On the phone app

Open Settings → Glucose Units and choose mg/dL or mmol/L. The change applies across the app -- the home screen, history, and notifications all follow your choice. Your unit is tied to your account, so it stays the same when you sign in on another device.

On the watch

The watch face doesn't have its own unit setting -- it shows whatever your phone is set to. Change the unit on your phone (Settings → Glucose Units) and your watch follows automatically the next time it updates.

Switching units changes only what you see

Behind the scenes, GlycemicGPT always keeps your glucose in one consistent form, and every safety check -- range banding, alert thresholds, and the limits that keep impossible readings out -- runs on that same underlying value. Switching your unit only relabels the numbers you read.

The same reading is always classified the same way. A glucose value that's "low" on your phone is the same "low" on the web dashboard and the watch, no matter which unit you're viewing. The color and the alert never change just because the number on screen is written differently.

How mmol/L numbers are shown

mmol/L values are shown to one decimal place -- the same level of detail your CGM or meter uses. mg/dL values are whole numbers.

When you type in a threshold in mmol/L (for example, a low-glucose alert level), the app keeps it on a whole-number scale behind the scenes. You don't need to think about that: the threshold you save is shown back to you exactly as you entered it, and your alert fires at the level you chose. That same behind-the-scenes scale is what keeps every threshold inside the safe range.

What caregivers see

If you've linked a caregiver, they see your glucose in your unit -- not theirs. A caregiver who personally prefers mg/dL will still read your numbers in mmol/L if that's what you've chosen, so you're both looking at the same numbers when you talk.

Alerts and briefs from before you switched

Alerts and daily briefs that were already created keep the unit they were written in. Only new alerts and briefs use your new unit. So just after switching, your history may show a mix -- older entries in the old unit, newer ones in the new unit. This is expected and clears up as new entries come in.