Calculators

Estimates a child's skeletal maturity (bone age) based on the Greulich & Pyle atlas, which compares an X-ray of the left hand and wrist to standard images for different ages. This calculator provides an approximation and should be used in conjunction with professional medical evaluation.

Calculates the number of semitones between two musical notes.

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.

Estimates the storage size of an image file based on dimensions, color depth, and compression.

Calculates points for each event in a heptathlon based on performance marks.

This calculator converts grams to tablespoons for various ingredients, taking into account their specific densities for precise measurement.

Calculates the number of light bulbs needed to adequately illuminate a room based on its dimensions, desired light level, and bulb specifications.

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

Calculates Dungeons & Dragons 5e ability scores based on the point buy allocation method. Allows you to distribute points to determine your character's starting stats.

Calculates the volume or number of moles of a gas at Standard Temperature and Pressure (STP). STP is defined as 0°C (273.15 K) and 1 atm pressure. This calculator uses the ideal gas law to perform these calculations.