Free, evidence-based calculators for everyday diabetes decisions. Each tool is built on the standard formulas used by NICE, the ADA, and major clinical guidelines, with clear interpretation alongside the result. No sign-up. No data stored — everything runs in your browser.
Main calculators
Quick-reference mini-calculators
How to use these tools well
Calculators are screening and estimation tools, not diagnoses or prescriptions. The HbA1c converter, BMI tool, glucose unit converter, eGFR calculator, and time-in-range estimator are safe to use on your own — they help you understand a number you’ve 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.
What’s coming next
- QRISK3 cardiovascular risk score (10-year)
- Diabetes UK Know Your Risk integrated walkthrough
- Insulin dose adjustment helper for endurance exercise
- FINDRISC (Finnish Diabetes Risk Score) calculator
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.