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12 calculators
Endocrine calculators turn routine laboratory results into dosing and screening decisions in diabetes and thyroid clinics: estimating insulin resistance, translating HbA1c into an average glucose figure, matching glucocorticoid doses across different preparations, and working out starting levothyroxine requirements. They are revisited as treatment is titrated, so results are read against the patient's current regimen, comorbidities, and the most recent measurements rather than in isolation.
This page groups by clinical area, so the tools below are the ones this setting reaches for — the subject-focused view of the same calculators lives on the categories pages, the full alphabetical list collects everything in one place, and the comparison tool lines up three tools side by side when two of them look interchangeable.
Estimates insulin resistance from fasting plasma glucose and fasting serum insulin using the Homeostasis Model Assessment (HOMA) equation.
EndocrinologyEstimates pancreatic beta-cell function from fasting plasma glucose and fasting serum insulin using the HOMA equation.
EndocrinologyProvides a simple estimate of insulin sensitivity as the reciprocal of HOMA-IR.
EndocrinologyEstimates mean plasma glucose from HbA1c using the ADAG formula validated by the American Diabetes Association.
EndocrinologyCalculates the triglyceride-glucose (TyG) index, a surrogate marker of insulin resistance derived from fasting triglycerides and fasting plasma glucose: TyG = ln(TG × FPG / 2) with units in mg/dL. Elevated values indicate greater insulin resistance and higher cardiometabolic risk.
EndocrinologyCalculates the ratio of fasting triglycerides to HDL cholesterol. A ratio ≥ 3.0 (mg/dL units) has been used as a marker of insulin resistance in overweight non-diabetic adults. The predictive value is ethnicity-dependent and is not reliable in African American populations.
EndocrinologyCalculates QUICKI, an index of insulin sensitivity derived from fasting insulin and fasting glucose: QUICKI = 1 / (log10 fasting insulin [µU/mL] + log10 fasting glucose [mg/dL]). Lower values indicate greater insulin resistance; the index is primarily a research and screening tool.
EndocrinologyCorrects the QT interval for heart rate using the Bazett formula.
EndocrinologyEstimates the approximate full-replacement levothyroxine dose for adults using ~1.6 µg/kg/day (FDA levothyroxine labeling). It is NOT a universal prescribing dose calculator: the actual starting dose depends on age, duration and severity of hypothyroidism, cardiovascular status, pregnancy status, residual thyroid function, and clinical/laboratory findings.
EndocrinologyConverts between equivalent glucocorticoid and mineralocorticoid doses of commonly used adrenal steroids.
EndocrinologyCalculates the free thyroxine index (FTI or T7) from total T4 and the T3 resin uptake, an indirect estimate of free thyroid hormone used when direct free T4 assays are unavailable or when binding-protein status is in question.
EndocrinologyAssesses metabolic syndrome using the updated NCEP ATP III criteria, which require at least 3 of 5 components: elevated waist circumference, elevated triglycerides (or treatment), reduced HDL (or treatment), elevated blood pressure (or treatment), and elevated fasting glucose (or treatment).
Endocrinology