Practical guides, how-tos and comparisons to get the most out of our free online tools.
The 18.5 cut-off is a population screening line, not a diagnosis. Here is where it comes from, what the mortality data below it actually show, and the three things it cannot see: body composition, recent change — which is far more informative than the level — and the fact that the same line does not fit every age or every population.
Sofia Nunes · 11 min read
How much dry pasta to cook per person — about 2 oz (100 g) — plus how to scale for a main course, kids and a crowd.
Marco Bianchi · 4 min read
Blood pressure has two numbers: systolic and diastolic, measured in mmHg. Learn the ACC/AHA categories from normal to hypertensive crisis and what they mean.
Sofia Nunes · 3 min read
Milk production has a computable cost: volume times energy density divided by the efficiency of conversion. Do the sum and you get about 675 kcal a day, not the 500 that gets quoted. Here is the derivation, why the published increment is deliberately lower, how much the real spread is between mothers, what the water requirement actually rests on, and why cutting calories while feeding is a clinical question.
Sofia Nunes · 12 min read
Fuel is only part of what a mile costs. Add depreciation, insurance and maintenance to find your true cost per mile — and why it is higher than the pump suggests.
Marco Bianchi · 5 min read
Size a sand order from area and depth: get the volume in cubic yards and the weight in tons for a bedding layer, sandbox or base course.
Marco Bianchi · 4 min read
A plain-language guide to closing costs: notary and legal fees, transfer taxes and lender charges, and why they typically add several percent to the purchase price.
Camille Laurent · 3 min read
The extra energy a pregnancy costs is far smaller than the phrase suggests, and it arrives on a schedule: near zero in the first trimester, modest in the second, real in the third. Here are the published increments from EFSA, FAO/WHO/UNU and the 2023 US reference intakes, what they look like as food, and why protein and folate rise proportionally faster than calories do.
Sofia Nunes · 13 min read
Convert oven temperatures between Fahrenheit, Celsius and gas mark, and learn why a fan (convection) oven runs 20 °C cooler.
Marco Bianchi · 3 min read
Turn a marathon goal time into a pace per mile and hold even splits. Learn the math, the pacing strategy, and how to check your target is realistic.
Aisha Karim · 3 min read
Dividend yield sounds simple — dividend divided by price — but a high number can be a warning sign. Here is how to read it and why total return matters more.
Camille Laurent · 4 min read
Larger deposit, shorter term, higher rate, and a balloon at year five. On the same $120,000 plot, the land loan costs $768.10 a month against a mortgage's $606.79 — and demands $18,000 more at closing.
Camille Laurent · 15 min read