Blood Sugar Average Calculator

Calculate your average blood glucose levels and estimated A1C. Monitor your blood sugar trends for better diabetes management.

mg/dL

Quick Facts

Normal Fasting
70-100 mg/dL
Healthy fasting range
Prediabetes
100-125 mg/dL
Fasting blood sugar
Diabetes Threshold
126+ mg/dL
Fasting blood sugar
Target A1C
Below 5.7%
Non-diabetic range

Your Results

Calculated
Average Blood Sugar
-- mg/dL
Mean glucose level
Estimated A1C
--%
3-month average indicator
Status
--
Based on fasting levels

Key Takeaways

  • Normal fasting blood sugar is between 70-100 mg/dL
  • A1C reflects your average blood sugar over the past 2-3 months
  • Prediabetes range is fasting glucose of 100-125 mg/dL or A1C of 5.7-6.4%
  • Regular monitoring helps identify trends before they become problems
  • Consult your healthcare provider for personalized targets

Understanding Blood Sugar Averages

Blood sugar average is a critical metric for anyone monitoring their glucose levels, whether for diabetes management, prediabetes prevention, or general health awareness. By calculating your mean blood glucose, you can better understand your metabolic health patterns over time.

This calculator takes your total blood sugar readings and divides by the number of measurements to give you an accurate average. It also estimates your A1C, which represents your blood sugar control over the past 2-3 months.

Blood Sugar Reference Ranges

Category Fasting (mg/dL) A1C (%) 2-Hour Post-Meal
Normal 70-99 Below 5.7% Below 140 mg/dL
Prediabetes 100-125 5.7-6.4% 140-199 mg/dL
Diabetes 126+ 6.5% or higher 200+ mg/dL

How A1C is Estimated

The A1C (also called HbA1c or glycated hemoglobin) is calculated using the formula:

A1C = (Average Blood Sugar + 46.7) / 28.7

This formula converts your average blood glucose in mg/dL to an estimated A1C percentage. The actual lab test measures the percentage of hemoglobin proteins in your blood that have glucose attached.

Pro Tip: Timing Matters

For the most accurate average, try to include readings from different times of day: fasting (morning), pre-meal, 2 hours post-meal, and bedtime. This gives a complete picture of your glucose patterns.

Why Monitor Blood Sugar?

  • Early Detection: Catch prediabetes before it progresses to type 2 diabetes
  • Medication Adjustment: Help your doctor fine-tune your diabetes treatment
  • Lifestyle Impact: See how diet, exercise, and sleep affect your glucose
  • Complication Prevention: Maintain control to reduce risk of heart, kidney, and nerve damage

Important Medical Disclaimer

This calculator provides estimates for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider for personalized blood sugar targets and medical decisions.

Tips for Better Blood Sugar Control

  • Eat balanced meals with fiber, protein, and healthy fats
  • Limit refined carbohydrates and added sugars
  • Exercise regularly - even a 15-minute walk after meals helps
  • Stay hydrated and get adequate sleep
  • Manage stress through relaxation techniques
  • Take medications as prescribed by your doctor