0…9|−|.
bksp|del
space
v|enter
tab
**=|`**
z
…
Help

Stopwatch: [ start,
\ lap, ] total |
set1
2
units × dates tz chars … currency |

• It's just one html page. With
good ol' table design and big see-me-from-afar letters. Well, digits.

• The digits, dot and minus keys enter the number to convert.

• The space clears the input.

• Backspace and Del remove the last digit/dot (backspace doesn't work if you have
a "previous" page in the browser history).

• Letters 'pntefdckTEFDCKri' modify the value. Try and see.

• No other editing means are available (except the evaluator). Z is undo!

• Control+V or just V or simply Enter paste the clipboard contents (if it's a number)
into the converter.

• The Tab key swithes between two sets of convertions/calculations.

• Keys ` and = ask for a math expression and evaluate it.

• The evaluator (aka calculator) is just the javascript eval function with some
syntactic sugar: pi, PI, e, E, LN2, LN10, SQRT2 are the constants,
s** q**rt,

• Factorization of big numbers may take long time. E.g. testing for primeness of 100000000000031 (that's 10^14+31) takes about 30 seconds or P-IV 1.8 GHz.

• The calendar is 'borrowed' from the Google applets.

• If the input number looks like a date (D, DD, MDD, MMDD, YMMDD, YYMMDD, YYYYMMDD), the week day and the distanse to that date are calculated. Years 0..39 are considered in the XXI century, 40..99 — in the XX-th.

• Stopwatch has clear-start ([), show-elapsed-time (]) and store-lap-time (\) functions.