So this article "Quantum leap for mass as science redefines the kilogramme" said that there is a new definition of the kilogram coming. But they neglected to mention what that new definition is exactly. All they said was that it's now based on Planck's Constant. So I worked my way backwards trying to figure out what that is. First I divided the Planck by the kilogram, and came up with this: h / 1 kg = 6.62607×10^-34 m^2/s So that unit (m^2/s) looks like I can use the standard constants the speed of light and the metre. h / (1 kg * 1 m * c) = 6.62607×10^-34 m^2/s / (1 m * c) = 2.2102191×10^-42 Consequently after rearranging, we get: 1 kg = h / (2.2102191×10^-42 m * c) ~ 4.5244383E+41 h / (c * 1 m) Is that all there is to it? Just some weird huge number multiplied by the Planck divided by the speed of light and the meter? Do I need to throw some Pi's or Euler's numbers in there too?