Calculators

Converts a decimal inch measurement into its equivalent fractional representation (inches and fractions of an inch).

Finds the Z-score corresponding to a given cumulative probability (percentile) on a normal distribution.

Estimates the total surface area of a human body using various formulas. Body surface area (BSA) is the measured or calculated surface of a human body. For many clinical purposes, BSA is a better indicator of metabolic mass than body weight because it is less affected by abnormal body fat. BSA is an important factor in many physiological and clinical situations.

Calculates the expected project duration and variance using optimistic, pessimistic, and most likely time estimates.

Estimates the strength of a password based on its length and character set diversity, measured in bits of entropy. Higher entropy values indicate stronger, more secure passwords.

Calculates the average where some data points contribute more weight than others.

Performs a t-test (one-sample, two-sample, or paired) to compare means and determine statistical significance.

Compares the unit price of two items to determine the better deal.

Calculates the effectiveness of a treatment in reducing the number of microorganisms by measuring the log reduction value.

Analyzes forces and distances in a lever system based on the fulcrum position.