Blood glucose (BG)
An estimate of sugar in your blood, usually shown in mg/dL. GlucoseCurve shows how BG might rise and fall after meals and insulin.
Free • Educational • No login required
See how meals, insulin, and daily life might shape your glucose curve.
GlucoseCurve lets you explore simple, visual examples of blood glucose patterns — using sample curves, your own readings, or CGM/CSV data — all on your device.
- Learn how different carb types and insulin timing might change a curve.
- Use your own BG readings to explore how a specific meal behaved.
- Upload CGM or logbook data to look for possible patterns over time.
GlucoseCurve is for learning only and not for real-world dosing decisions. Always follow your healthcare team’s guidance.
Not sure where to start?
Pick what you have right now. Then I’ll ask one quick follow‑up and send you to the best page. No sign‑ups. No uploads. Just a starting point.
Step 1: What do you have today?
Step 2: One quick detail
Tap an option above to get a recommended page.
Tip: If you’re just exploring, start with Simulator. If you want patterns over days, start with the Log Book.
How the site is organized
The menu is grouped into clear sections so you can start simple and grow from there. You can move through them in order, or jump to what fits today.
1. Simple learning curves (sample data)
These pages use only example numbers. They’re meant to answer “what might happen if…” without using any of your actual data.
Good starting point
Meal & Insulin Simulator
Choose a starting BG, carb type and amount, and when rapid-acting insulin is taken. The page shows possible curves for different insulin-timing choices.
Sample data • Visual only Already ate?“From Now” Curve
Imagine you’ve already eaten a meal and insulin is given. This page starts the curve from “now” and shows a possible pattern for the next few hours.
Sample data • Future curve2. Get started with your numbers
These tools use your own BG readings from around a real meal. The model is still simplified, but the curves are based on numbers you enter.
One carb source
Carb Impact Curve
Enter several BG readings before and after one type of carb (for example, a fast-acting snack). See how that carb appears to affect your BG over time.
Your readings Two meals togetherCarb Impact Curve ×2
Start with readings from a first meal, then add a second meal you’re thinking about eating. The tool shows how a new carb load might stack on top of what’s already happening.
Your readings + new meal3. Illustrate your data
These tools work together to help you gently explore patterns in your own numbers. You don’t need perfect data — even a few days can be useful.
1
Basic Log Book
Log different data types in one place — blood glucose, carbs, sleep, activity, stress, insulin, and notes.
Simple entry • Your data 2Visualize Your Numbers
Turn your log book into graphs. See how BG changes alongside sleep, activity, stress, and meals over time.
Log book analysis 3Your Dashboard
View simple comparisons and summaries from your log book, like shorter vs longer sleep days or higher vs lower stress days.
Patterns & summaries4. Dexcom data
If you use a CGM, you can also explore longer-term glucose patterns by uploading a Dexcom CSV file.
Key terms used around the site
These are simplified, educational explanations. Actual values and timing are individual — always follow your healthcare team’s advice.
Carbohydrates (carbs)
The part of food that turns into glucose. Many tools ask for the grams of carbs in a meal or snack.
Carb type
A rough idea of how quickly carbs might hit: fast, moderate, or slow. Fast carbs may raise BG quickly; slow carbs may raise BG more gradually.
Insulin-to-carb ratio
How many grams of carbs are covered by 1 unit of rapid-acting insulin (for example, 1 unit for every 10 g of carbs). This is usually set with your care team.
Insulin sensitivity factor
About how many mg/dL your BG might drop from 1 unit of rapid-acting insulin. This is sometimes called a correction factor.
Carb sensitivity
A simplified idea of how much your BG might rise per gram of carbs if there is no extra insulin given. Some sample models here use this to shape the curve.
Time on the graph
Most graphs focus on the few hours after a meal. That’s often when rapid-acting insulin is most active and then fades.
Sample vs. real data
Some pages use example numbers only (learning curves). Others use BG readings or CGM/CSV data you provide. None of these are meant to replace your actual care plan.
Safety and limitations
GlucoseCurve is an educational tool. It uses simplified models and example numbers that do not reflect your personal insulin needs, digestion, or medical history.
Do not use this site to choose insulin doses, treat lows or highs, or make changes to your diabetes care. Always talk with your healthcare team before changing anything about your treatment or routine.