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 total cholesterol to HDL ratio and non-HDL cholesterol, then review those results as adjunct lipid markers alongside the rest of the panel.
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 and review it as a descriptive lipid-balance marker alongside the rest of the lipid panel.
Peak Flow Percentage Calculator — Calculate peak expiratory flow (PEF) as a percentage of predicted or personal-best values and place the result into the usual Green/Yellow/Red monitoring zones.
Spirometry Predicted Value Calculator — Calculate predicted FEV1, FVC, and FEV1/FVC values from reference equations and compare measured results against those predicted values.
Triglyceride/HDL Ratio Calculator — Calculate the triglyceride-to-HDL cholesterol ratio and use it as a rough lipid-pattern marker alongside the rest of the lipid panel.