Math & science

Calculate the arithmetic mean of a list of numbers.

Find the median (middle value) from a list of numbers.

Calculate probabilities for single events.

Instantly convert numbers to and from millions. Enter 1 and get 1,000,000 — no need to count zeros. Fast, simple million number converter.

Instantly convert numbers to and from billions. Enter 1 and get 1,000,000,000 — no need to count zeros. Fast, simple billion number converter.

Instantly convert numbers to and from trillions. Enter 1 and get 1,000,000,000,000 — no need to count zeros. Fast, simple trillion number converter.

Instantly convert numbers to and from quadrillions. Enter 1 and get a number with 15 zeros — no need to count zeros. Fast, simple quadrillion number converter.

Instantly convert numbers to and from quintillions. Enter 1 and get a number with 18 zeros — no need to count zeros. Fast, simple quintillion number converter.

Instantly convert numbers to and from sextillions. Enter 1 and get a number with 21 zeros — no need to count zeros. Fast, simple sextillion number converter.

Instantly convert numbers to and from septillions. Enter 1 and get a number with 24 zeros — no need to count zeros. Fast, simple septillion number converter.

Instantly convert numbers to and from octillions. Enter 1 and get a number with 27 zeros — no need to count zeros. Fast, simple octillion number converter.

Instantly convert numbers to and from nonillions. Enter 1 and get a number with 30 zeros — no need to count zeros. Fast, simple nonillion number converter.

Instantly convert numbers to and from decillions. Enter 1 and get a number with 33 zeros — no need to count zeros. Fast, simple decillion number converter.

Convert dog age to an equivalent human age using a life-stage based formula.

Convert human years to cat years using a life-stage based formula.