Add or Subtract a Percentage Calculator
Calculate adjusted value
This calculator allows you to increase or decrease any number by a percentage instantly.
It is commonly used in pricing, discounts, VAT calculations, salary adjustments, and financial planning.
Understanding how percentages affect values is essential for making accurate financial decisions.
Simply enter a base value and a percentage to calculate the adjusted result.
Understanding your result
The result shows the final value after applying the percentage change.
A positive percentage increases the value, while a negative percentage decreases it.
This makes it easy to calculate price increases, discounts, and financial adjustments.
How the calculation works
Formula: Base × (1 + Percentage ÷ 100)
The percentage is converted into a decimal and applied to the base value.
Where this is used
- Pricing: Apply markups to products
- Discounts: Reduce prices during sales
- VAT: Add tax to base prices
- Salaries: Calculate pay increases
Examples
Example 1:
£100 + 20% = £120
Example 2:
£80 − 10% = £72
Example 3 (Business):
£50 product + 25% markup = £62.50
Example 4 (VAT):
£100 + 20% VAT = £120
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Frequently asked questions
How do I add a percentage?
Multiply by 1 plus the percentage.
How do I subtract a percentage?
Multiply by 1 minus the percentage.
Where is this used?
Pricing, VAT, discounts and financial calculations.