Percentage Calculator
Calculate percentages, changes, differences, and original amounts.
Enter your values and select Calculate.
Choose the calculation based on what you know
Use Percentage increase or Percentage decrease when one number is the starting value. The change is measured against that starting amount. Use Percentage difference for a comparison based on the two amounts’ average.
To undo a discount, choose Reverse percentage. Enter 80 as the final amount and −20 as the signed change. The calculator divides 80 by 0.8 to find the original 100.