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Clinical calculators and reference utilities.

Quick calculators for doctors, with formula notes and references. Use them for orientation and verify final decisions with patient context and local protocol.

BMI eGFR CrCl Calcium HbA1c Anion Gap
These tools are for healthcare-professional education and quick reference. They do not replace clinical judgment, laboratory validation, prescribing information, or local hospital protocol.

What Makes This Useful

Not just a number Each tool adds interpretation, common pitfalls, and what to check next, so the result is useful at the bedside or clinic desk.
Doctor-first cautions Results highlight when formulas can mislead, such as AKI, pregnancy, altered muscle mass, anemia, CKD, edema, or low albumin.

Calculators

Anthropometry

BMI Calculator

Body mass index using weight in kg and height in cm.

Do not missIn Indian and South Asian patients, cardiometabolic risk may appear at lower BMI. Add waist circumference and metabolic risk review.
Can misleadEdema, pregnancy, sarcopenia, athletic body composition, and fluid overload can make BMI less useful.
Kidney

eGFR CKD-EPI 2021

Estimated GFR from age, sex, and serum creatinine.

Next checksAdd urine ACR, repeat kidney function, BP, diabetes status, nephrotoxic medicines, and trend over at least 3 months before labeling CKD.
Can misleadAcute kidney injury, very low muscle mass, amputations, bodybuilders, pregnancy, and rapidly changing creatinine reduce reliability.
Dosing

Creatinine Clearance

Cockcroft-Gault estimate for drug-dosing orientation.

Drug dosing noteCockcroft-Gault is often used for drug labels. Choose actual, ideal, or adjusted weight carefully, especially in obesity or frailty.
Not the sameCreatinine clearance and eGFR are not interchangeable. For dosing, check the medicine label and local formulary guidance.
Electrolytes

Corrected Calcium

Albumin-corrected calcium in mg/dL.

Next checksIf abnormal, review symptoms, ECG risk, phosphate, magnesium, PTH, vitamin D, renal function, albumin trend, and causative medicines.
Can misleadIn critical illness, CKD, acid-base disturbance, or major protein abnormalities, ionized calcium is often more clinically useful.
Diabetes

HbA1c to eAG

Estimated average glucose from HbA1c.

Clinic useUse eAG to explain HbA1c to patients in everyday glucose language. Pair with fasting/PP readings or CGM when available.
Can misleadAnemia, CKD, hemoglobinopathy, transfusion, pregnancy, and altered RBC turnover can make HbA1c discordant with true glucose.
Acid Base

Anion Gap

Serum anion gap with optional albumin correction.

Pattern thinkingIf high, consider lactate, ketones/DKA, renal failure, salicylates, toxic alcohols, sepsis, shock, and medication/toxin history.
Albumin mattersLow albumin can hide a high-gap acidosis. Correcting for albumin may reveal clinically important risk.

References

CKD-EPI 2021 eGFR equation Race-free creatinine equation for estimated GFR. Use with clinical context and local laboratory reporting practices. National Kidney Foundation reference
Cockcroft-Gault creatinine clearance Common drug-dosing estimate. Consider actual, ideal, or adjusted body weight according to prescribing context. Original PubMed record
HbA1c and estimated average glucose ADAG-derived relationship: eAG mg/dL = 28.7 x HbA1c - 46.7. Diabetes Care reference
BMI classification BMI is a screening measure. Clinical interpretation varies by ethnicity, sarcopenia, edema, pregnancy, and body composition. WHO reference
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