A1C Calculator & Blood Sugar Log

Convert average glucose to A1C with the A1C Calculator & Blood Sugar Log. GMI calculator and mmol/L to mg/dL converter in one panel.

A1C Calculator & Blood Sugar Log helps you understand an HbA1c lab result and keep a private glucose log in the browser side panel. Type the A1C from your lab report in % or mmol/mol and see the estimated average glucose (eAG) in mg/dL and mmol/L, plus the ADA range the value falls in. The a1c calculator & blood sugar log also includes a GMI calculator for CGM users, a mmol/L to mg/dL converter with g/L, and a blood sugar log with a one-page report for your doctor. No account, no ads, and your data stays on this device. 🔢 A1C CALCULATOR AND CONVERTER • HbA1c in % or IFCC mmol/mol to eAG in mg/dL and mmol/L, in four linked fields • Average glucose to A1C works both ways: as an eAG calculator, type the average to see the matching value • Plain-language result with ADA ranges: normal below 5.7 %, prediabetes 5.7–6.4 %, diabetes range 6.5 % and above • Save the lab result with its date and follow your trend over time 📊 GMI CALCULATOR FOR CGM DATA 1. Type the mean glucose from your CGM report (mg/dL or mmol/L), or a GMI value 2. Read the Glucose Management Indicator in % and mmol/mol, clearly labelled as an estimate 3. Add your lab result to see the GMI vs A1C difference in percentage points 4. The formula and its source are shown next to the result (Bergenstal et al., 2018) 📋 A1C CONVERSION CHART AND DAILY TARGETS • The Ref tab has an A1C conversion chart from 4 % to 14 % with eAG and ADA ranges • Tap it to see the formulas behind every value, from A1C to blood sugar in both units • A daily targets table lists common fasting, after-meal and bedtime ranges; your doctor may set different targets 🔄 MMOL/L TO MG/DL CONVERTER ▸ Convert a single meter reading between mg/dL, mmol/L and g/L ▸ mg/dL to mmol/L and back in one field, with no estimated A1C attached ▸ g/L is included for lab reports from France and other countries that use it 🩸 BLOOD SUGAR LOG - Your glucose log: add a reading in two taps with its context (fasting, before meal, after meal, bedtime or other) - Readings and lab results are kept apart, so a single reading is never shown as your HbA1c - Search, edit and delete entries, and switch between mg/dL and mmol/L at any time 📈 CHARTS AND TIME IN RANGE ✓ Glucose over time with your target band ✓ Time in range in five bands from very low to very high (consensus ranges, Battelino 2019) ✓ Averages by context and a time-of-day pattern ✓ Lab HbA1c trend, plus an a1c estimator from your log (GMI) after 14 days and 14 readings, always marked as an estimate 🩺 READY FOR YOUR APPOINTMENT • One-page PDF report for your doctor with the lab trend, averages and time in range • Printable blank log sheet for two weeks, in your unit • Export your blood glucose log as CSV or plain text, or as a JSON backup you can import on another computer ⏰ OPTIONAL REMINDERS The a1c calculator & blood sugar log can remind you to check your glucose at the times you choose, and when your next lab test is due. Chrome asks for the notifications permission only when you turn a reminder on. ❓ FAQ Q: How does the a1c calculator & blood sugar log convert A1C to average glucose? A: With the ADAG formula: eAG (mg/dL) = 28.7 × A1C − 46.7. IFCC (mmol/mol) = (A1C % − 2.15) × 10.929, and 1 mmol/L = 18.015 mg/dL. Q: What is the difference between GMI and a lab A1C? A: GMI is calculated from CGM glucose: GMI (%) = 3.31 + 0.02392 × mean glucose (mg/dL). The lab test measures glycated hemoglobin. The two often differ, so share both with your care team. Q: Is the A1C Calculator & Blood Sugar Log a diagnosis? A: No. It is for information and personal records only. It is not a medical device and does not diagnose or treat any condition. Q: I used an older version. What happens to my saved entries? A: They stay. Entries that version 1.4 saved with a Fasting, After meal or Before bed tag are listed for review, so you decide which were meter readings. 🔒 PRIVATE BY DESIGN Everything you enter stays in your browser storage on this device. There is no account and no server that receives your readings. A JSON backup is a file you keep. 🌍 LANGUAGES AND UNITS The store page of the A1C Calculator & Blood Sugar Log is in 52 languages. The app itself is in 13 languages; it follows your browser language, and you can pick another one in Settings. Units follow your region (% and mg/dL in the US, mmol/mol and mmol/L in the UK and much of Europe) and can be changed at any time. Open the A1C Calculator & Blood Sugar Log from the toolbar icon; it opens in the side panel. Pin it to keep the a1c calculator & blood sugar log one click away.