Free tools
Diabetes Calculators
Use these browser-based tools to convert HbA1c, estimate average glucose, check BMI-related diabetes risk, count meal carbohydrates, estimate eGFR, convert glucose units, and review CGM time-in-range numbers.
No sign-up is needed, and the values you enter stay in your browser.
HbA1c to average glucoseConvert HbA1c percent, IFCC mmol/mol, eAG mg/dL and eAG mmol/L.Open calculator
Glucose unit converterSwitch between mmol/L and mg/dL, with plain-language context for common ranges.Open converter
BMI diabetes riskCheck BMI, waist and ethnicity-aware risk signals using NICE-aligned thresholds.Check risk
Carb counter and bolus estimateBuild a meal, total carbs and fibre, and estimate bolus using your prescribed settings.Count carbs
eGFR kidney functionEstimate eGFR from creatinine, age and sex using the CKD-EPI 2021 race-free equation.Estimate eGFR
Time in range and GMIEstimate GMI from CGM average glucose and compare TIR with international targets.Review CGM
Glucose unit converterSwitch between mmol/L and mg/dL, with plain-language context for common ranges.Open converter
BMI diabetes riskCheck BMI, waist and ethnicity-aware risk signals using NICE-aligned thresholds.Check risk
Carb counter and bolus estimateBuild a meal, total carbs and fibre, and estimate bolus using your prescribed settings.Count carbs
eGFR kidney functionEstimate eGFR from creatinine, age and sex using the CKD-EPI 2021 race-free equation.Estimate eGFR
Time in range and GMIEstimate GMI from CGM average glucose and compare TIR with international targets.Review CGM
Important: these calculators are educational and cannot replace medical advice. If a result is unexpected, very high, very low, or linked with symptoms, use your care plan and contact your diabetes team.