The best replacement for lb is kg.

The best alternatives to lb are rated as following:
★★★★★  kg
★★★★★  oz
★★★★  lbs
★★  lbf
★  lbm
★  kilo
  kass
  lb
  stone
  2yt
  lb ft
  ounce
  tb
  20 lb propane cylinder
  280 lb
  sb
  ft lb
  gc-lb
  kilos
  ft-lb
  8 lb carpet pad
  gc lb
  kilogram

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Other search terms related to lb and their ratings are:
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