The best replacement for percentage is percent.

The best alternatives to percentage are rated as following:
★★★★★  percent
★★★  percentile
★★  proportion
★★  ratio
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★  bmi
★  proof
★  points
★  probability
★  gpa
★  margin
★  percentage points
★  basis points
★  ppm
★  frequency
★  odds
  batting average
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Speaking about percentage, one probably shouldn't forget about calculator.

Other search terms related to percentage and their ratings are:
★★★★★ calculator
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percentage
percent
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