weight   floor   round    ceil  charged
  0.80     0.0     1.0     1.0      2 kg
  2.00     2.0     2.0     2.0      2 kg
  2.10     2.0     2.0     3.0      3 kg
  3.50     3.0     4.0     4.0      4 kg
  4.00     4.0     4.0     4.0      4 kg
  7.25     7.0     7.0     8.0      8 kg
sqrt(2) = 1.414214, pow(1.1, 12) = 3.1384
