The best replacement for square feet is square meter.

The best alternatives to square feet are rated as following:
★★★★★  square meter
★★★★  square foot
★★★★  acre
★★★★  cubic feet
★★★★  feet
★★★  linear feet
★★★  square meters
★★★  square yards
★★  acres
★  square yard
★  yards
★  foot
★  usable square feet
★  board feet
★  btu
★  meters
★  meter
★  area
★  lot size
  acreage
  gaj
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  yard

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Speaking about square feet, one probably shouldn't forget about gallon of paint cover.

Other search terms related to square feet and their ratings are:
★★★★★ gallon of paint cover
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square feet
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