Knowing how to subtract a percentage from a number is useful for discounts, price reductions, expense reductions, depreciation, and many other calculations.
Basic Formula
Suppose you want to subtract 20% from 500.
First find 20% of 500:
500 × 0.20 = 100
Subtract the result:
500 − 100 = 400
Therefore:
500 minus 20% = 400
Faster Method
You can calculate the final amount directly:
Original Number × (1 − Percentage ÷ 100)
Using the previous example:
500 × 0.80 = 400
Practical Example
A product costs $1,000 and is discounted by 35%.
1,000 × 0.35 = 350
The new price is:
1,000 − 350 = $650
The Percentage Calculator can also be used when you want to calculate percentages quickly without working through each step manually.
Important Point
Subtracting 20% and then adding 20% does not return a number to its original value because the second percentage is calculated from a different base number.