Free Laboratory Calculators & Clinical Lab Tools
Quick, browser-based calculators for common laboratory formulas — kidney function, urine ratios, diabetes, electrolytes and lipids. Each tool shows the exact formula, unit conversions, a worked example and its limitations. These calculators are educational and do not replace laboratory interpretation or medical judgment.
Kidney / Renal Tools
Diabetes Tools
Clinical Chemistry Tools
Lipid Tools
How to use these laboratory calculators
Every calculator runs entirely in your browser — the values you type are not stored or sent to our servers. Enter results exactly as they appear on the laboratory report and choose the matching unit (for example mg/dL or µmol/L for creatinine). The tool converts units internally before applying the published formula, then shows the result, the formula used and the calculation steps so the number can be checked.
Why calculated values need context
Most laboratory formulas were developed in specific adult populations and assume a steady state. Results can be less reliable at extremes of age or body size, in pregnancy, during acute illness, or when kidney function is changing quickly. Laboratory methods and reference intervals also differ between labs, so a calculated value should always be read alongside the original report and interpreted by a qualified healthcare professional.
For laboratories and hospitals
Doxcels Lab Management Software (LIS) can calculate values like eGFR automatically on patient reports, alongside analyzer interfacing, delta checks and digital sign-off.