Seven temperature scales - Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Rømer and Delisle - converted through one affine table so every round trip is exact. Includes the body and cooking temperatures you actually look up.
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Turn a distance and a finish time into pace per kilometre, pace per mile, speed in km/h and mph, and metres a second, plus the finish times that same pace holds to across six benchmark distances.
Days between any two dates, business days with weekends skipped, whole and exact weeks, and the gap in plain words.
Percent of a number, what percent one value is of another, percent increase and decrease, and the difference between two percentages, each with the formula shown.
Determinant, inverse, trace, rank and transpose for a matrix you type in, with clean messages for non-square and singular input.
Drag out a grid definition and get the CSS with media queries attached.
See how much mobile data streaming, gaming and video actually costs you per month.
Match a heading and body font with real Google Fonts pairings and scale steps.
Point at any node in a JSON document and get the exact path to reach it.
