Blood Glucose Levels Calculator

Easily convert and check your blood glucose levels with our online Blood Glucose Levels Calculator. Get instant results in mg/dL, mmol/L, and A1C.

Ever wondered what your blood sugar levels really mean? Keeping track of them i key, whether you have diabetes or just want to stay healthy. Our Blood Glucose Levels Calculator helps you convert and understand your blood sugar in seconds. No complicated math just quick and accurate results.

What Are Blood Glucose Levels?

Blood glucose (or blood sugar) is the amount of sugar in your bloodstream. Your body uses glucose for energy, but too much or too little can cause problems.

There are two common units to measure blood sugar:

mg/dL (milligrams per deciliter) – Used mostly in the U.S.
mmol/L (millimoles per liter) – Common in the U.K., Canada, and Australia.

Your A1C (HbA1c) level is different. It shows your average blood sugar over the past 2-3 months and is measured as a percentage.

A1C Estimation from Average Blood Glucose

How to Convert Blood Sugar Readings

If you need to switch between mg/dL and mmol/L, here’s how:

To convert mg/dL to mmol/L: $\text{mmol/L} = \frac{\text{mg/dL}}{18}$
To convert mmol/L to mg/dL: $mg/dL = mmol/L \times 18$

For A1C estimation, use this:

$A 1 C (%) = \frac{Average Blood Glucose (mg/dL) + 46.7}{28.7}$

If you measure in mmol/L:

$A 1 C (%) = \frac{Average Blood Glucose (mmol/L) \times 18 + 46.7}{28.7}$

Blood Sugar Conversion Table

Blood Sugar (mg/dL)	Blood Sugar (mmol/L)	Estimated A1C (%)
70	3.9	4.6%
90	5.0	5.1%
114	6.3	5.7%
126	7.0	6.0%
140	7.8	6.4%
170	9.4	7.5%
200	11.1	8.5%
250	13.9	10.1%
300	16.7	11.9%

How to Use the Blood Glucose Levels Calculator

It’s simple just follow these steps:

Enter your blood sugar in mg/dL or mmol/L.
Pick the unit you want to convert to.
Click “Calculate” and get instant results.
See your estimated A1C for long-term tracking.

What’s a Normal Blood Sugar Level?

Normal blood sugar depends on whether you’ve eaten recently.

Condition	Normal (mg/dL)	Normal (mmol/L)
Fasting (no food for 8+ hrs)	70 – 99	3.9 – 5.5
After meals (2 hrs)	Less than 140	Less than 7.8
Prediabetes (Fasting)	100 – 125	5.6 – 6.9
Diabetes (Fasting)	126+	7.0+

If your numbers are too high or too low, talk to a doctor.

Final Thoughts

Managing blood sugar doesn’t have to be confusing. With this Blood Glucose Levels Calculator, you can easily check where you stand. Whether you're tracking for diabetes or just curious about your health, knowing your numbers helps you stay in control.

FAQs

What’s the A1C for a blood sugar of 170?

A blood sugar level of 170 mg/dL is about 7.5% A1C.

What’s my A1C if my blood sugar is 114?

If your glucose is 114 mg/dL, your A1C is around 5.7%.

Can I calculate my A1C at home?

Yes! You can estimate it using our calculator or use an at-home A1C test kit.

How do I convert mmol/L to mg/dL?

Multiply your mmol/L value by 18.

What’s the normal fasting blood sugar level?

A normal fasting level is 70-99 mg/dL (3.9-5.5 mmol/L).

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