Blood Sugar Log: Free Online and Printable
Write each reading down with the time and what was happening, then print the page or export a CSV for your appointment. Your log is saved only in this browser. Nothing is sent to us.
Add a reading
This browser is blocking local storage, so your entries will be lost when you leave. Export a CSV before you go.
Your log
No entries yet. Add one above, or print the blank sheet below.
| When | Reading | Situation | Note | Delete |
|---|
How it works
- Add a reading. Type the number in the unit your meter shows. We store it in mg/dL and show it in the unit you pick.
- Review. The summary shows the average, lowest, highest and how many readings were under 70 mg/dL.
- Share on paper or in a file. Print your log, print a blank sheet, or export a CSV that opens in any spreadsheet.
What to record
A reading alone says little. The time and the situation make it useful. The ADA describes checking before meals and one to two hours after a meal starts, and many people also check on waking and at bedtime. Which checks you make, and how often, is a decision for you and your care team. The situation menu above covers the common ones.
- Fasting or wake-up: a morning pattern is what a care team often asks about. See fasting blood sugar and the dawn phenomenon.
- Before and after meals: compare with the targets on the blood sugar chart, and see blood sugar after eating.
- Symptoms: write them next to the number. If a reading is low, follow the rule of 15.
Privacy
This page works entirely in your browser. There is no account, and no reading is uploaded. The one exception is anonymous page analytics, and only if you accept the cookie choice. Those count a visit and, for the log, that an entry was added or printed, never the values. See our privacy policy.
Frequently asked questions
Where is my blood sugar log stored?
Only in this browser, on this device, using local storage. We never receive it. That also means clearing site data, switching browsers or using a private window will not show the same log, so export a CSV now and then.
How do I back up or move my log?
Use Export CSV. The file opens in Excel, Numbers and Google Sheets and includes each reading in both mg/dL and mmol/L. There is no import yet, so keep the CSV as your copy.
Can I print a blank log book page?
Yes. Print blank sheet makes a one-page table with 28 rows, space for your care team’s target range, and a column for notes. Print it as many times as you like.
What should I write in the notes?
Anything that helps explain a number: food, activity, illness, stress, a late meal or a missed one. Do not write passwords or other private details. Your care team can use the notes to spot patterns.
Does the log tell me what to do about a number?
No. It only records and summarizes. For readings below 70 mg/dL, see the rule of 15. For very high readings or symptoms, follow your care team’s plan and the emergency box on the highs and lows pages.
Information only, not medical advice. Your care team may set different targets for you, and only a lab test ordered by a clinician can diagnose diabetes or prediabetes. See our medical disclaimer.
Sources
- ADA Standards of Care in Diabetes—2026, Section 6: Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises
- NIDDK: Diagnosis of Diabetes and Prediabetes
Last reviewed: by the Diabetes Blogs editorial team. Information only, not medical advice.
