Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Anion Gap Calculator

Calculates the anion gap from serum sodium, chloride, and bicarbonate to help identify the cause of metabolic acidosis. Clinicians use it whenever a patient presents with unexplained acidosis or altered mental status.

Sodium (mEq/L)

Chloride (mEq/L)

Bicarbonate (mEq/L)

Fill in the required fields to see your result.

Medicine

Kidney Function Calculator (eGFR)

Estimates your glomerular filtration rate (eGFR) using the CKD-EPI equation from serum creatinine, age, sex, and race. Clinicians and patients use it to stage chronic kidney disease and track how well the kidneys are filtering blood.

Serum Creatinine (mg/dL)

Age (years)

Gender

Race

Fill in the required fields to see your result.

Key differences

	Anion Gap Calculator	Kidney Function Calculator (eGFR)
Category	Medicine	Medicine
Inputs required	3	4
Result	Anion Gap (mEq/L)	eGFR (Kidney Function) (mL/min/1.73m²)
What it does	Calculates the anion gap from serum sodium, chloride, and bicarbonate to help identify the cause of metabolic acidosis. Clinicians use it whenever a patient presents with unexplained acidosis or altered mental status.	Estimates your glomerular filtration rate (eGFR) using the CKD-EPI equation from serum creatinine, age, sex, and race. Clinicians and patients use it to stage chronic kidney disease and track how well the kidneys are filtering blood.