Percentage Calculator
A fast, free online percentage calculator. Find the percent of a number, percentage increase, decrease, or difference, and original values - with the formula worked out for every result.
Calculate a Percentage of a Number
What is
% of
?
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Formula: percent ÷ 100 × value. Example: 15% of 200 = 15 ÷ 100 × 200 = 30.
Find What Percentage One Number Is of Another
is what % of
?
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Formula: part ÷ whole × 100. Example: 30 ÷ 150 × 100 = 20%.
Calculate Percentage Change Between Two Values
From
to
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Percentage increase or decrease
Formula: (new − old) ÷ |old| × 100. Example: from 80 to 120 = (120 − 80) ÷ 80 × 100 = +50%.
Calculate Percentage Difference Between Two Numbers
vs
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Symmetric: order does not matter
Formula: |a − b| ÷ ((a + b) ÷ 2) × 100. Example: 40 vs 60 = 20 ÷ 50 × 100 = 40%.
Add or Subtract a Percentage From a Value
±
%
Increase
–
Decrease
–
Formula: value × (1 ± percent ÷ 100). Example: 500 + 20% = 600, 500 − 20% = 400.
Calculate the Original Value Before a Percentage Change
after
% change
Enter values above
Original value before the change
Formula: final ÷ (1 + percent ÷ 100). Example: 600 after +20% = 600 ÷ 1.2 = 500.