Printable Blood Sugar Journal
Manage diabetes with precise glucose tracking
Log blood sugar levels, insulin doses, meals, and notes to maintain tight glucose control. An essential tool for diabetics and pre-diabetics managing their condition.
Customize fields
Toggle fields on or off. Click the pencil to rename, or add your own fields.
Benefits
How to Use
What is this journal?
A blood sugar journal is an essential tool for anyone managing diabetes or pre-diabetes. By recording your glucose levels throughout the day alongside insulin doses, carbohydrate intake, meals, and medications, you build a comprehensive picture of how your body responds to food, activity, and treatment. This journal is designed to make daily tracking simple and consistent.
Understanding blood sugar patterns is the foundation of effective diabetes management. A written log allows you and your healthcare team to identify trends — such as post-meal spikes, dawn phenomenon, or the impact of exercise — that fingerstick readings alone cannot reveal. With consistent entries, you gain the ability to make proactive adjustments to diet, medication timing, and lifestyle habits.
Whether you are newly diagnosed and learning how your body reacts, or a long-term diabetic fine-tuning your regimen, this journal transforms scattered data into actionable knowledge. Bring it to your endocrinologist appointments and watch the quality of your consultations improve dramatically.
Filled example
Here's what a typical entry looks like when filled in:
| Date | Time | Period | Blood sugar | Insulin | Medication | Carbs (g) | Meal | Notes |
|---|---|---|---|---|---|---|---|---|
| 2026-03-01 | 07:00 | Fasting | 105 | 8 | Metformin 500mg | 0 | — | Fasting reading upon waking |
| 2026-03-01 | 09:30 | After breakfast | 148 | 0 | — | 45 | Oatmeal with berries | Slightly higher than target |
| 2026-03-01 | 12:00 | Before lunch | 112 | 6 | — | 0 | — | Returned to normal range |
| 2026-03-01 | 14:30 | After lunch | 156 | 0 | Metformin 500mg | 55 | Grilled chicken sandwich | Need to reduce bread portion |
| 2026-03-01 | 22:00 | Bedtime | 118 | 10 | — | 30 | Light salad | Good evening number |
How to fill in each field
Each page is a table with columns. Fill in one row per entry. Here's what each column is for:
Date
Write today's date. This anchors your entry in time and helps when reviewing entries later.
Time
Record the time of the measurement or event. Consistent timing makes data comparable and reveals time-of-day patterns.
Period
Blood sugar
Record your blood sugar reading. Tracking alongside meals and activity reveals what raises or lowers your levels.
Insulin
Record insulin units administered. Accurate insulin tracking is essential for managing blood sugar and adjusting dosages.
Medication
Record medications taken, including name and dosage. Consistent tracking helps you and your doctor evaluate treatment effectiveness.
Carbs (g)
Meal
Describe the meal associated with this entry. Context around meals (before, after, what you ate) helps identify correlations with your readings.
Notes
Add any additional context or thoughts. This catch-all column is for anything that doesn't fit elsewhere but might be useful later.
Tips for success
When and how often to write
Test and log at the times your doctor recommends — typically fasting (morning before eating), before meals, and 2 hours after meals. Record every reading with time, meal context, and any relevant notes (exercise, stress, illness). Weekly, review your patterns: Which meals cause the biggest spikes? Which time of day are readings highest? Monthly, calculate your average fasting and post-meal values to share with your healthcare team. Consistent logging is what transforms raw numbers into actionable treatment guidance.
Frequently Asked Questions
What blood sugar targets should I aim for?
Per ADA Standards of Care (2024, Diabetes Care, 47 Suppl 1): fasting 80–130 mg/dL (4.4–7.2 mmol/L); 1–2 hours postprandial <180 mg/dL (<10.0 mmol/L); HbA1c <7% for most adults. Targets vary by age, pregnancy, hypoglycemia risk, and comorbidities. Pediatric and pregnancy targets are tighter per ACOG. Always follow your endocrinologist's individualized goals — these journal entries are documentation, not diagnosis.
When should I test blood sugar throughout the day?
ADA recommends testing at consistent times: fasting (on waking), pre-meal, 1–2 hours post-meal, bedtime, and during symptoms. Type 1 patients on intensive insulin typically test 4–8 times daily; type 2 patients on oral medications may test 1–2 times. The period column (fasting/pre-meal/post-meal/bedtime) makes patterns clear. Discuss the right frequency with your endocrinologist or diabetes educator.
How do I correlate carbs with blood sugar response?
Per ADA, a postprandial glucose rise of >50 mg/dL above pre-meal levels indicates insufficient insulin or excess carbs for the dose. The carbs (g) and blood sugar columns paired across 2 weeks reveal personal carb-to-glucose ratios and insulin sensitivity. Bring this to your endocrinologist for dose adjustment — Diabetes Care (2020, 43(7)) shows continuous review of these patterns reduces HbA1c by 0.5–1%.
What is hypoglycemia and how do I respond?
ADA defines hypoglycemia as blood sugar <70 mg/dL (<3.9 mmol/L), severe when <54 mg/dL. Symptoms include shakiness, sweating, confusion, hunger. Treat with 15 g fast-acting carbs (juice, glucose tabs), recheck in 15 minutes, repeat if still low. Severe hypoglycemia with altered consciousness requires glucagon or emergency care. Log all events — frequent lows indicate need for medication adjustment.
How does this differ from a continuous glucose monitor (CGM)?
CGMs (Dexcom, Libre, Medtronic) provide 288 readings/day with trend arrows. Diabetes Care (2021, 44(1)) shows CGMs improve HbA1c more than fingersticks alone. But the journal captures context — meal composition, exercise, illness, stress — that CGMs miss. Use both: CGM for granular data, journal for the explanatory narrative. ADA increasingly recommends CGM for type 1 and intensively-managed type 2.
What insulin types should I record in the medication column?
ADA categorizes: rapid-acting (lispro, aspart, glulisine) given before meals; long-acting (glargine, detemir, degludec) once or twice daily for basal coverage; premixed combinations. Record name, units, and timing in medication. Bring 2+ weeks of journal pages to your endocrinologist — basal/bolus adjustments depend on patterns invisible to single-point HbA1c.
How do exercise and illness affect blood sugar?
Per ADA: aerobic exercise typically lowers glucose during and 24+ hours post-exercise; resistance training may raise it acutely. Illness, infection, and steroid use raise glucose substantially. Note these in the notes column — they explain readings that would otherwise look erratic. Sick-day protocols (test every 2–4 hours, maintain hydration, check ketones if type 1) should be reviewed with your diabetes team.
When do glucose readings warrant urgent medical attention?
ADA red flags: blood sugar >300 mg/dL (>16.7 mmol/L) with symptoms (vomiting, abdominal pain, fruity breath, rapid breathing) suggests DKA — an emergency. Persistent readings >250 with positive ketones (type 1) also require ER evaluation. Severe hypoglycemia with confusion needs glucagon and emergency care. Document all events — frequent extremes signal the need for treatment intensification.
