Calculators

Calculates the pH of a solution based on hydrogen ion concentration ([H+]), or the acid dissociation constant (Ka) and solution concentration.

Calculates the pH, pKa, or the ratio of acid and conjugate base concentrations using the Henderson-Hasselbalch equation. This equation is commonly used in chemistry, biology, and medicine to estimate the pH of a buffer solution.

Calculates the percentage by mass of each element in a chemical compound.

Calculates the molality of a solution given the moles of solute and the mass of the solvent.

Determines the electron configuration and number of valence electrons for a given element based on its atomic number.

Calculates the molar mass (molecular weight) of a chemical compound or element. Enter the chemical formula to calculate its molar mass.

Calculates the probability of having a condition after receiving a diagnostic test result (using Bayes' Theorem).

Calculates measures of diagnostic test accuracy, including sensitivity (True Positive Rate) and specificity (True Negative Rate).

Converts a number of steps into an approximate distance in miles.

Estimates the time or calorie deficit needed to reach a specific weight loss goal.