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.

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 number of semitones between two musical notes.

Helps locate End Portals in Minecraft using triangulation from thrown Eyes of Ender.

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

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.

Convert between millions and billions easily.

Calculates the hit points (HP) for characters or monsters in Dungeons & Dragons 5th Edition, based on their Constitution modifier and Hit Dice.

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

Calculates the number of full stacks and remaining items for a given quantity of an item in Minecraft.