Vitals, Labs & Longevity calculators
Kidney, electrolyte and screening calculators.
eGFR Kidney Function Calculator
Kidney filtration rate using CKD-EPI 2021.
Creatinine Clearance Calculator
Cockcroft-Gault estimate used for drug dosing.
Anion Gap Calculator
Serum anion gap, corrected for albumin.
Corrected Calcium Calculator
Calcium adjusted for low albumin.
Corrected Sodium Calculator
Sodium adjusted for high blood glucose.
BUN-to-Creatinine Ratio Calculator
Helps tell dehydration from kidney problems.
Serum Osmolality Calculator
Blood concentration from sodium, glucose and BUN.
Body Temperature & Fever Checker
Convert °C and °F and see if it counts as a fever.
Age Calculator
Exact age in years, months and days, plus next birthday.
Pack-Years Calculator
Smoking history and lung cancer screening eligibility.
Free Water Deficit Calculator
Estimate the water deficit in high sodium (hypernatraemia) using body water fraction.
Fractional Excretion of Sodium (FENa) Calculator
Estimate how the kidneys handle sodium from urine and serum values.
Osmolal Gap Calculator
Difference between measured and calculated serum osmolality.
Delta Ratio (Delta-Delta) Calculator
Compare the anion gap rise with the bicarbonate fall in metabolic acidosis.
Winter’s Formula Calculator
Expected CO₂ compensation for metabolic acidosis.
MELD Score Calculator
Liver disease severity score from bilirubin, INR and creatinine (original MELD).
MCV and MCH Calculator
Red cell size and haemoglobin content from a full blood count.
Corrected Reticulocyte Count Calculator
Adjust the reticulocyte percentage for the degree of anaemia.
Transferrin Saturation Calculator
Iron saturation of transferrin from serum iron and TIBC.
Albumin-to-Globulin Ratio Calculator
Ratio of albumin to globulin from total protein and albumin.
Albumin-Corrected Anion Gap Calculator
Anion gap adjusted for low albumin.
De Ritis Ratio (AST/ALT) Calculator
Compare AST and ALT liver enzymes.
Neutrophil-to-Lymphocyte Ratio (NLR) Calculator
Ratio of neutrophils to lymphocytes from a blood count.
Creatinine Unit Converter
Convert serum creatinine between µmol/L and mg/dL.
Haemoglobin to Hematocrit Estimate
Estimate hematocrit from haemoglobin using the rule of three.
Related guides
Kidney Function and eGFR
Understand eGFR, creatinine and when kidney disease is diagnosed.
Lifestyle & PreventionElectrolytes and Common Lab Tests Explained
Sodium, calcium and anion gap in plain language.
Lifestyle & PreventionFever in Adults and Children: When to Worry
Fever is a symptom, not a disease. Know the red flags.