Fun

Convert your cat's age in years to human years using the standard AAHA feline life-stage conversion, with a worked breakdown of how the figure is reached.

Calculate the probability of flipping the same result on a streak of fair-coin flips, P(n) = (1/2)ⁿ, shown as a probability and as 1-in-X odds.

Convert your dog's age into human years with a size-aware calculator based on the AKC method.

Calculate a pitcher's Earned Run Average (ERA = earned runs × 9 / innings pitched) — the earned runs allowed per nine innings.

Score a fantasy football stat line under standard, half-PPR, or full-PPR rules, with a breakdown of passing, rushing, and receiving points.

Calculate your overthinking level and second date probability based on post-date anxiety indicators

Work out how many pizzas to order for a group: pizzas = round-up of (people × slices per person) ÷ slices per pizza, so nobody at your party goes hungry.

Calculate baseball slugging percentage (SLG) from at-bats and each kind of hit, weighting singles, doubles, triples, and home runs — plus total bases and batting average.

See what smoking really costs per day, month, year, and decade from how many cigarettes you smoke a day, the pack size, and the price per pack.

Convert a step count into distance in kilometres and miles using your average stride length — see how far 10,000 steps really is.

Calculate your typing speed in words per minute (WPM) and words per hour from the words you typed and the time it took.

Calculate win percentage from a win-loss-tie record, with ties counted as half a win, ignored, or counted as games — plus total games and win-loss ratio.