Blood test calculators
Some results only make sense as a ratio or a formula. Enter two or three numbers from your lab report and see the result, where it falls and what it means, in plain language. Free, no account, and nothing you type leaves your browser.
Upload your report and get all of them at onceDrop your lab report (a PDF or a photo) and HealthOS reads every marker, then works out every calculator your report allows, up to 20 of them side by side. Free, with no account.Blood sugar and insulinCholesterol and lipidsLiver and proteinsKidney and electrolytesBlood count and inflammationIronHormonesBiological age and units
Blood sugar and insulin
- HbA1c to average glucose calculator (eAG)Turn an HbA1c into the average blood sugar it stands for, or an average back into an HbA1c.You need: HbA1c, or an average glucoseOpen
- HOMA-IR calculatorInsulin resistance from fasting glucose and fasting insulin.You need: Fasting glucose and fasting insulinOpen
- TyG index calculator (triglyceride-glucose)Insulin resistance from fasting triglycerides and glucose, no insulin test needed.You need: Fasting triglycerides and fasting glucoseOpen
- QUICKI calculator (insulin sensitivity)Insulin sensitivity from fasting glucose and insulin; the other side of HOMA-IR.You need: Fasting glucose and fasting insulinOpen
Cholesterol and lipids
- LDL cholesterol calculator (Sampson, Martin-Hopkins, Friedewald)LDL from a standard lipid panel with the three common formulas, plus non-HDL and remnant cholesterol.You need: Total cholesterol, HDL and triglyceridesOpen
- TG/HDL ratio calculatorTriglycerides ÷ HDL: a simple pointer to insulin resistance, in mg/dL or mmol/L.You need: Triglycerides and HDLOpen
Liver and proteins
- FIB-4 calculator (liver fibrosis)A liver scarring score from age, AST, ALT and platelets.You need: Age, AST, ALT and plateletsOpen
- APRI calculator (AST to platelet ratio)A liver scarring score from AST and platelets.You need: AST and platelets (and your lab’s upper AST limit)Open
- De Ritis ratio calculator (AST/ALT)Which liver enzyme is leading, and what that pattern can point to.You need: AST and ALTOpen
- Albumin/globulin (A/G) ratio calculatorAlbumin ÷ globulin, from albumin and total protein or globulin.You need: Albumin, and total protein or globulinOpen
Kidney and electrolytes
- eGFR calculator (CKD-EPI 2021)Kidney filtering from creatinine, age and sex, with the race-free 2021 equation.You need: Creatinine, age and sexOpen
- BUN to creatinine ratio calculatorUrea nitrogen ÷ creatinine, from BUN or urea, in mg/dL or mmol/L.You need: BUN or urea, and creatinineOpen
- Corrected calcium calculatorCalcium adjusted for a low albumin, in mg/dL or mmol/L.You need: Calcium and albuminOpen
- Anion gap calculatorSodium − (chloride + bicarbonate), with an albumin correction.You need: Sodium, chloride and bicarbonateOpen
Blood count and inflammation
- NLR calculatorNeutrophil-to-lymphocyte ratio: a simple sign of stress and inflammation.You need: Neutrophils and lymphocytesOpen
- ANC calculatorAbsolute neutrophil count from your white cell count and neutrophil %.You need: White cell count and neutrophil %Open
- Mentzer index calculatorSmall red cells: does it look more like thalassaemia trait or iron deficiency?You need: MCV and red cell countOpen
- Sehgal index calculatorA second check on small red cells, read alongside the Mentzer index.You need: MCV and red cell countOpen
- PLR calculator (platelet-to-lymphocyte ratio)Platelets ÷ lymphocytes: an inflammation marker from a full blood count.You need: Platelets and absolute lymphocytesOpen
- SII calculator (systemic immune-inflammation index)Platelets × neutrophils ÷ lymphocytes: a combined inflammation marker from a full blood count.You need: Platelets, absolute neutrophils and absolute lymphocytesOpen
Iron
Hormones
Biological age and units
A pointer, not a diagnosis. Talk to a doctor about your result, and sooner if you feel unwell. Reference ranges are general-population guidance compiled from common clinical laboratories, not a diagnosis. Lab-to-lab ranges differ. Always read your results with your doctor.