How many working days a month has (usually 20–23), why it changes, and how to count the exact business days in any month, free online.
Convert km/h to mph and back — the exact factor, a quick mental shortcut, common speed limits, and a free speed converter.
The "multiply by 7" rule is a myth. Here's how to really calculate your dog's age in human years, with a free dog age calculator.
Convert height between centimetres and feet/inches easily — the conversion, quick reference points, and a free height converter.
Why February sometimes has 29 days, the exact divisible-by-4-except-100-but-yes-400 rule, and how to check any year — with a free checker.
Make balanced, unbiased teams for class, sports or game night in seconds — paste names and let a free random team generator do the shuffling.
Run a fair giveaway draw your audience will trust — how to pick a random winner, avoid bias, and handle ties, with a free random picker.
Why your calendar week number sometimes surprises you, how ISO-8601 defines week 1, and how to find the week number for any date.
Beat decision fatigue with chance — when to use a coin flip, a yes/no wheel, a random picker or dice, and why randomness is sometimes the smart choice.
Know what a road trip will cost in fuel before you leave — the simple formula, how mileage and price change it, and a free fuel cost calculator.
That "Lorem ipsum dolor sit amet" placeholder text has a 500-year history and a real purpose. What it is, why it beats real text, and a free generator.
Find your exact age from your date of birth — in years, months, days, even hours — and your age on any specific date, free.