Percentage Calculator – Fast Discounts, VAT, Sales Tax & % Change

Formulas & Calculation Methodology

            P% = (Value / Total) × 100
          

A percentage expresses a dimensionless ratio as a fraction of 100 parts.

How to Use Percentage Calculator

Choose the percentage calculation type from the intuitive tab options.
Enter the known values into the corresponding input fields.
Results update instantly in real-time as you type.
Review step-by-step formula explanations for educational or business purposes.

Frequently Asked Questions (FAQ)

How do I calculate a percentage increase or decrease?

Use the formula: Percentage Change = [(New Value - Original Value) / Original Value] × 100. A positive result indicates growth, while negative indicates a decrease.

Can this tool calculate combined discounts with sales tax?

Yes, the Discount & Tax mode lets you input original price, sale discount percentage, and applicable VAT/sales tax to show total savings and final amount payable.