Free, evidence-based calculators for everyday diabetes decisions. Each tool below is built on the standard formulas used by NICE, the ADA, and major clinical guidelines, and includes a clear interpretation alongside the result. No sign-up, no data stored.
Available calculators
How to use these tools well
Calculators are screening and estimation tools, not diagnoses or prescriptions. The HbA1c → eAG converter and the BMI tool are safe to use on your own — they help you understand a number you’ve already been given. The carb & bolus calculator is intended as a learning aid: never use it to set or change insulin doses without your diabetes team’s input.
None of these tools store any of your data. Everything runs in your browser.
What’s coming next
We’re building a wider toolkit:
- Time-in-range / GMI estimator from CGM averages
- eGFR (kidney function) from creatinine
- Diabetes UK Know Your Risk integrated walkthrough
- Glucose unit converter (mmol/L ↔ mg/dL) — quick standalone
- Carb counter mobile-friendly meal planner
If there’s a calculator you’d find useful, let us know via the contact form on our About page.
Pillar guides
- Type 2 Diabetes: Symptoms, Diagnosis, and Management
- Insulin Resistance: Causes, Tests, and How to Reverse It
- Diabetes Diet: Mediterranean, Low-Carb, Keto and Plant-Based
- Diabetes Medications: a complete guide
- Diabetes Complications: Heart, Kidney, Eye, and Foot Health
All calculators are reviewed against current NICE guidance and the ADA Standards of Care 2026. Last reviewed: May 2026.
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