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Opens on Chapter 7’s example: one a second, turned into every other unit.
Enter your numbers, then press Calculate.
From the book, Chapter 7. Anchors from the book: 8,760 hours in a year; about 2,000 working hours; 86,400 seconds in a day and 604,800 in a week; 31,536,000 seconds in a year, 0.4% away from π × 10⁷ = 31,415,927. Light from the Sun takes about 500 seconds. A million seconds is 11.6 days. $25 an hour is about $50,000 a working year.
Rounding is half up, the way the book rounds. Numbers can be typed as 1,450, $38, 12%, 1/20, 2.5 million or 3 × 10⁷. Everything stays in your browser: no sign-up, nothing stored or sent.