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Free, online percentage calculators

What Can You Calculate?

  • Have a '20% off' voucher? See what you'll actually pay at the till. — Apply My Voucher
  • Shopping the sale rail? Find out exactly how much you save. — See My Savings
  • Business purchase? Calculate the ex-VAT price from the total. — Remove VAT
  • Price excluding VAT? Add VAT to see the total. — Calculate Final Price
  • Got a pay rise? See how much your new pay will be. — See My New Pay
  • Closing a deal? Calculate the exact commission you'll take home. — See My Commission
  • Rent or bills went up? Calculate the exact percentage increase. — See % Change
  • Exams coming up? Find the minimum mark to pass. — Calculate My Mark
  • Dining out? Calculate a discretionary tip or service charge. — Calculate Tip
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Basic Percentage Calculator

What is X% of Y?

% of
is
… …
read-only Answer/Result
Maximum of 20 saved calculations reached. Remove existing ones to save new ones.
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    Original Value Calculator

    What is the original value if X% of it equals Z?

    % of
    … …
    read-only Answer/Result
    is
    Entering 0 here causes a division by zero error.
    Maximum of 20 saved calculations reached. Remove existing ones to save new ones.
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      Part-to-Whole Percentage Calculator

      What percentage of Y is Z?

      … …
      read-only Answer/Result
      of
      is
      Entering 0 here causes a division by zero error.
      Maximum of 20 saved calculations reached. Remove existing ones to save new ones.
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        Percentage Change Calculator

        What is the percentage change from the Original value to the New value?

        From
        to
        is a change of:
        … …
        read-only Answer/Result
        Entering 0 here causes a division by zero error.
        Maximum of 20 saved calculations reached. Remove existing ones to save new ones.
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          Value Increase Calculator

          X increased by Y% is what?

          increased by
          %
          is
          … …
          read-only Answer/Result
          Maximum of 20 saved calculations reached. Remove existing ones to save new ones.
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            Original Before Increase Calculator

            What was the Original value before an Increase % resulted in the New value?

            … …
            read-only Answer/Result
            increased by
            %
            is
            Cannot calculate when increase is -100% (division by zero)
            Maximum of 20 saved calculations reached. Remove existing ones to save new ones.
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              Value Decrease Calculator

              X decreased by Y% is what?

              decreased by
              %
              is
              … …
              read-only Answer/Result
              Maximum of 20 saved calculations reached. Remove existing ones to save new ones.
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                Original Value Before Decrease Calculator

                X decreased by Y% was originally what?

                … …
                read-only Answer/Result
                decreased by
                %
                is
                Maximum of 20 saved calculations reached. Remove existing ones to save new ones.
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                  Last updated: February 2026