REDUCE A NUMBER BY PERCENTAGE

Subtract a percentage from a number to find the new value





Reduce a Number by Percentage – Formula and Examples

This calculator subtracts a percentage from a number, giving you the new, smaller value. Enter the starting number and the percentage you want to subtract. This is useful for:

- applying a discount to a price
- calculating a salary after a cut
- projecting a decline by a fixed percentage
- working out a price before commission is subtracted
- any "what if I take away X%" question

Formula

Formula: new value equals number minus percentage of number, or number times open parenthesis 1 minus p over 100 close parenthesis

Examples

Example 1: Discount
Take 20% off a $200 jacket.
200 − (200 × 20 / 100) = 200 − 40 = 160
The sale price is $160.

Example 2: Salary cut
A $50,000 salary is reduced by 10%.
50000 − (50000 × 10 / 100) = 50000 − 5000 = 45000
The new salary is $45,000.

Example 3: Decline projection
Reduce this year's 800 members by an expected 12% next year.
800 − (800 × 12 / 100) = 800 − 96 = 704
Projected membership: 704.

When to Use This Calculator

Use this when you know the starting number and the percentage you want to subtract, and need the resulting value. If instead you know both the starting and ending values and want to find the percentage between them, use the percentage decrease calculator instead.

Frequently Asked Questions

Can I use this for an increase instead?
Use the increase a number by percentage calculator for adding a percentage.

What if the percentage is 100% or more?
At 100%, the result is zero. Above 100%, the result goes negative — only meaningful for values that can go below zero, like a balance.

Related tools: increase a number by percentage and percentage decrease calculator.