https://frinklang.org/frinkdata/units.txt is one of the things i find myself reading and using to complain about things. Frink is a conversion tool and calculator, like "how many grains of rice worth of calories is needed to boil 1 liter of water" and even more esoteric stuff. It also can correctly convert between most of the esoteric units (rods, hogsheads, furlongs).
Frink has phone apps, so you don't need a data connection as you would with wolfram alpha or google.
Naah. It's defined in terms of the second, nowadays, but it's based on the circumference of the Earth: The meter was originally defined as one ten-millionth of the distance between the equator and the poles.
Frink has phone apps, so you don't need a data connection as you would with wolfram alpha or google.