Endocrinology Calculators
35 calculators & risk scores
Browse 35 Endocrinology clinical calculators and risk scores used in everyday UK practice. Every tool runs entirely in your browser — enter the values and get instant scoring, colour-coded interpretation bands and a link to the underlying guideline or publication. ClinCalc Pro is free, needs no sign-up, and is built for working clinicians.
These endocrinology tools span Diabetes, Medications, Electrolytes, Obesity, Thyroid, Prognosis and more.
- HbA1c Interpretation (mmol/mol)Interprets HbA1c in IFCC mmol/mol: diagnostic thresholds and NICE treatment targets. To convert to DCCT %: % ≈ 0.0915 × mmol/mol + 2.15.
- DKA Severity ClassificationClassifies diabetic ketoacidosis severity in adults by pH, bicarbonate and blood ketones (ADA/EASD/JBDS consensus 2024): the worst variable sets the grade.
- Steroid Dose EquivalenceConverts corticosteroid doses to prednisolone equivalent. Useful for switching steroids or assessing adrenal suppression risk.
- Corrected Sodium (Hyperglycaemia)Corrects serum sodium for the dilutional effect of hyperglycaemia to reveal true sodium status.
- Waist-to-Height Ratio (Central Adiposity)NICE measure of central adiposity for adults with a BMI below 35 kg/m², of both sexes and all ethnicities: waist circumference ÷ height. For BMI itself use the BMI calculator.
- Insulin TDD EstimatorEstimates total daily dose (TDD) of insulin for new insulin starts. 50% basal, 50% bolus split. Adults: starting dose for a basal-bolus regimen (0.3 units/kg if frail, elderly or with renal impairment; 0.5 units/kg otherwise). Children: use a children's formulary and the paediatric diabetes team.
- Thyroid Function InterpreterInterprets TSH and free T4 pattern to classify thyroid function status.
- FINDRISC — Diabetes Risk ScoreFinnish Diabetes Risk Score for predicting 10-year risk of developing type 2 diabetes.
- HOMA-IR — Insulin ResistanceHomeostatic Model Assessment of Insulin Resistance. HOMA-IR = (Fasting Glucose × Fasting Insulin) / 22.5.
- Metabolic Syndrome Criteria (IDF 2006)IDF 2006 criteria for metabolic syndrome. Central obesity is required plus ≥2 of 4 additional criteria.
- Rotterdam PCOS CriteriaRotterdam 2003 diagnostic criteria for Polycystic Ovary Syndrome. Requires 2 of 3 criteria after exclusion of other aetiologies.
- UK Prospective Diabetes Study (UKPDS) Risk EngineThe UKPDS Risk Engine estimates 10-year coronary risk in type 2 diabetes from continuous values (Stevens 2001, UKPDS 56). The points tally this page showed was not a published score.
- Burch-Wartofsky Point Scale for ThyrotoxicosisScoring system for diagnosing thyroid storm (thyrotoxic crisis) and guiding treatment urgency. Score ≥ 45 is highly suggestive of thyroid storm.
- Ideal & Adjusted Body WeightCalculates Ideal Body Weight (Devine formula) and Adjusted Body Weight for use in drug dosing, ventilator settings, and nutrition.
- Adrenal Insufficiency AssessmentGuidance on when to test for adrenal insufficiency (Addison's disease and secondary adrenal insufficiency) and how to treat a suspected adrenal crisis. There is no validated points score — the page's tally was not a published method.
- AUSDRISK — Australian Type 2 Diabetes Risk ToolAUSDRISK (Chen 2010; Australian Government form) estimates the 5-year risk of type 2 diabetes from 11 questions. A score of 12 or more is high risk and warrants a fasting glucose or HbA1c test. The score may overestimate risk in people younger than 25.
- Edmonton Obesity Staging System (EOSS)5-stage clinical staging system for obesity that incorporates comorbidities, functional limitations, and wellbeing — beyond BMI alone. Guides treatment intensity. Stage 0 = no complications; Stage 4 = end-stage complications.
- Relative Fat Mass (RFM) CalculatorSimple anthropometric formula estimating body fat percentage using height and waist circumference. More accurate than BMI for predicting body fat. Males: RFM = 64 − (20 × height/waist). Females: RFM = 76 − (20 × height/waist).
- CANRISK — Canadian Diabetes Risk QuestionnaireCANRISK (Public Health Agency of Canada) screens adults for prediabetes and undiagnosed type 2 diabetes from 15 questions. It was developed in adults aged 40–74; the Canadian Task Force uses ≥ 33 (high) and ≥ 43 (very high) to guide HbA1c screening.
- Glucose Infusion Rate (GIR) CalculatorCalculates glucose infusion rate in mg/kg/min from IV infusion parameters. Critical for neonatal and paediatric care, and for insulin infusion management in adults. Confirms adequate glucose delivery.
- Harris-Benedict Equation — Resting Energy ExpenditureEstimates basal/resting energy expenditure (REE/BEE) in kcal/day using age, weight, height, and sex. Total Daily Energy Expenditure (TDEE) = REE × activity factor. Widely used for nutrition planning in clinical and outpatient settings.
- Insulin Correction Factor (ICF/ISF)Estimates how much 1 unit of rapid-acting insulin will lower blood glucose. Calculated using 'Rule of 1700' (mmol/L) or 'Rule of 1800' (mg/dL) divided by Total Daily Dose (TDD). Used for correction bolus dosing in type 1 and type 2 diabetes.
- Weight-Based Levothyroxine Dose CalculatorEstimates the starting levothyroxine dose for primary hypothyroidism (NICE NG145). Adults under 65 without cardiovascular disease: 1.6 micrograms/kg/day, rounded to the nearest 25 micrograms. Adults aged 65 and over or with cardiovascular disease: start 25–50 micrograms/day and titrate. Children: use a children's formulary.
- Random C-Peptide — Diabetes ClassificationFasting C-peptide to fasting glucose ratio helps distinguish type 1 from type 2 diabetes and assesses residual beta-cell function. Low ratio suggests type 1 or insulin deficiency; high ratio suggests type 2 or insulin resistance.
- Burch-Wartofsky Score (Thyroid Storm)Quantifies likelihood of thyroid storm (thyrotoxic crisis). Score >= 45 = thyroid storm; 25-44 = impending storm.
- Diabetes Sick Day Risk AssessmentSick-day rules for people with diabetes who are unwell. There is no validated points score — the page's tally was not a published method.
- Cushing Syndrome Probability ScoreGuidance on whom to test for Cushing's syndrome and which first-line tests to use. There is no validated points score — the page's tally was not a published method.
- Acromegaly Diagnosis Score (SAGIT)Acromegaly is confirmed by IGF-I above 1.3 × the age-adjusted upper limit with typical features (Acromegaly Consensus Conference, Pituitary 2024). SAGIT® (signs and symptoms, associated comorbidities, GH, IGF-I, tumour) is a clinician staging form with its own scoring — not the 5-item tally this page used.
- Adrenal Crisis Risk ScoreGuidance on adrenal-crisis risk and sick-day rules in people with adrenal insufficiency or on long-term glucocorticoids. There is no validated points score — the page's tally was not a published method.
- Pheochromocytoma Clinical Probability (10% Rule)Guidance on whom to test for phaeochromocytoma and paraganglioma (PPGL). There is no validated points score — the page's tally (and its "10% rule" name) was not a published method.
- Hypoglycaemia Severity ClassificationClassifies a hypoglycaemic episode in diabetes by the International Hypoglycaemia Study Group / ADA levels: level 1 alert value (< 3.9 mmol/L), level 2 clinically significant (< 3.0 mmol/L), level 3 severe (needs assistance).
- Thyroid Function Test InterpretationSystematically interprets TSH + free T4 patterns to identify hypothyroid, hyperthyroid, subclinical, and central thyroid disease. Guides management decisions.
- ACR TI-RADS — Thyroid Imaging Reporting & Data SystemAmerican College of Radiology TI-RADS (2017) for risk-stratifying thyroid nodules on ultrasound: points from 5 feature categories (echogenic foci are additive) → TR1–TR5 with FNA and follow-up size thresholds.
- Wagner-Meggitt Classification of Diabetic Foot UlcersClassic 6-grade classification of diabetic foot ulcers based on depth and ischaemia (Meggitt 1976; Wagner 1981). Drives debridement, antibiotic and amputation decisions. Complemented by University of Texas system (which also grades infection and ischaemia).
- SINBAD Score for Diabetic Foot UlcerSimple 6-domain diabetic-foot ulcer classification (Ince 2008) — recommended by IWGDF for international comparison. Each domain 0/1; total 0–6.