A weight-based daily estimate, not medical advice. Kidney or heart conditions change what is appropriate - follow your clinician's number, not this one.
millilitres a day

Difference between two Unix timestamps or dates, broken down into days, hours, weeks and years.

Draw a wheel of any size, spin it with a fair cryptographic pick and land the winner under the pointer.

Draw random whole numbers in any range, with unique and sorted modes and a cryptographic source.

Convert 1-3999 both ways, see how each numeral adds up and catch non-standard forms like IIII.

The barometric formula reading an altitude straight off a pressure, beside the hypsometric equation turning a known height change and temperature into the pressure you should expect to read there.

Water intake, urine volume, urinary calcium and urinary oxalate scored 0-100 with each factor's points and the arithmetic shown, so you can see which input moved the number. An educational estimate, not medical advice.

Convert between Mw, mb, Ms and ML with the published linear relations, then read the radiated energy in joules and in tonnes of TNT.

Size a rain tank from a monthly mass balance of catchment, rainfall, runoff coefficient and household demand, with days of autonomy.