Compare calculators

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

Pack Years Calculator

Calculates cumulative smoking exposure in pack-years by multiplying daily cigarette packs by years smoked. Used by physicians to quantify lung cancer risk, COPD staging, and eligibility for lung cancer screening programs.

Packs per Day (packs)

Years Smoked (years)

Fill in the required fields to see your result.

Medicine

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.

Key differences

	Pack Years Calculator	Anion Gap Calculator
Category	Medicine	Medicine
Inputs required	2	3
Result	Pack Years (pack-years)	Anion Gap (mEq/L)
What it does	Calculates cumulative smoking exposure in pack-years by multiplying daily cigarette packs by years smoked. Used by physicians to quantify lung cancer risk, COPD staging, and eligibility for lung cancer screening programs.	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.