Blood pressure, blood sugar, cholesterol, and spirometry calculators. Browse our free vitals & lab values tools below — all calculators are instant, accurate, and require no sign-up.
Blood Pressure Category Calculator — Classify your blood pressure reading using AHA guidelines. See color-coded risk levels from Normal to Hypertensive Crisis with lifestyle recommendations.
Blood Sugar Converter — Convert blood sugar levels between mg/dL and mmol/L. View normal, prediabetic, and diabetic ranges with color-coded classifications.
Cholesterol Ratio Calculator — Calculate your total cholesterol to HDL ratio and non-HDL cholesterol. Assess cardiovascular risk using AHA and ATP III guidelines.
HbA1c to Average Glucose Calculator — Convert HbA1c percentage to estimated average glucose (eAG) in mg/dL and mmol/L using the ADAG study formula. Classify your A1c level.
LDL/HDL Ratio Calculator — Calculate your LDL to HDL cholesterol ratio. Assess cardiovascular risk with gender-specific optimal ranges and AHA guidelines.
Peak Flow Percentage Calculator — Calculate your peak expiratory flow (PEF) percentage of predicted or personal best. Get asthma zone classification (Green/Yellow/Red) and action plan guidance.
Spirometry Predicted Value Calculator — Calculate predicted FEV1, FVC, and FEV1/FVC ratio based on age, sex, height, and ethnicity. Classify airway obstruction severity using GOLD and ATS/ERS criteria.
Triglyceride/HDL Ratio Calculator — Calculate your triglyceride to HDL cholesterol ratio. Assess insulin resistance risk and cardiovascular health with optimal range guidelines.