Practical guides, how-tos and comparisons to get the most out of our free online tools.
Four different cups are in legal use, and the Australian tablespoon is a third bigger than everyone else's. But the error that actually ruins a bake is smaller than a border: the same cup of flour weighs 120 g or 160 g depending on how you filled it.
Marco Bianchi · 12 min read
Understand cost per mille, cost per click and cost per acquisition — how each is calculated, how they relate, and which one to optimize for at each stage of a campaign.
Daniel Okonkwo · 4 min read
Boomer, Gen X, Millennial, Gen Z or Alpha? Learn the commonly used birth-year ranges, why the boundaries are fuzzy, and how to place yourself if you were born near a cutoff.
Lena Hoffmann · 4 min read
Break any whole number into its prime building blocks with a factor tree or repeated division — and write the result as a clean prime factorization with exponents.
Lena Hoffmann · 4 min read
Median net worth by age band, how to calculate assets minus liabilities, and why the median — not the average — is the fair yardstick to compare yourself to.
Camille Laurent · 3 min read
Speed equals distance divided by time. Learn how to compute your running speed in mph, tell speed apart from pace and convert between the two.
Aisha Karim · 4 min read
Health bodies suggest losing about 1-2 lb (0.5-1 kg) per week. Learn the ~500-1000 kcal/day deficit behind that and why slow-and-steady lasts.
Sofia Nunes · 3 min read
Learn the break-even formula — fixed costs divided by contribution margin — and work out exactly how many units you must sell before you start making a profit.
Daniel Okonkwo · 4 min read
Turn wall and ceiling area into a sheet count using standard panel sizes and a waste allowance, so you order the right number of drywall sheets in one go.
Marco Bianchi · 3 min read
Work out how much grass seed to buy from your lawn area and the seed rate — with different rates for a new lawn versus overseeding.
Marco Bianchi · 3 min read
Estimate how many photos, songs, or hours of video fit on a card by dividing its capacity by the average file size.
Daniel Okonkwo · 4 min read
Understand marginal vs. effective tax rates, how progressive brackets work, and why a raise never gets fully taxed away — with a clear worked example.
Camille Laurent · 2 min read