What is a Percentage Calculator?

A Percentage Calculator is a free online tool that quickly solves any everyday percent problem in seconds. You can use it to find X% of a number, figure out what percent one number is out of a second number, and calculate percentage increase/decrease, discounts, tips, tax, and grades. It is suited for students, shoppers, and professionals who want a quick and easy way to get fast, accurate results without doing any math themselves or using spreadsheets.

How Does the Percentage Calculator Work?

• Percent of a number: enter the base (original value) and percent → get X% of the base.
• What percent is A of B? enter A and B → get (A ÷ B) × 100%.
• Increase/Decrease: enter Original and New → get % change and how much was added/removed.
• Reverse percent: enter Result and Percent → get the Original value.

Formulas Used in Percentage Calculations

• X% of Y: (X ÷ 100) × Y
• What percent is A of B: (A ÷ B) × 100%
• % Increase: ((New − Original) ÷ Original) × 100%
• % Decrease: ((Original − New) ÷ Original) × 100%
• Reverse percent (find Original): Original = Result ÷ (Percent ÷ 100)

Key Benefits of Using This Percentage Calculator Online

• Fast and easy: takes the user confusion, manual errors, and repetitive math away.
• Integrated: it covers all scenarios such as percent of, percent change, reverse percent, and “A is what percent of B”.
• Convenient: Works perfectly for discounts, tax/tip, grades, KPIs, profit/markup, budgeting, etc.
• User-friendly: Clean inputs, instant outputs, and simple to copy.
• Works on any device: Excellent on mobile, tablet PC, or desktop.

Disclaimer

This Percentage Calculator is for educational and informational purposes only. Results are based on standard percentage formulas and may include rounding. Always double-check important financial or academic calculations with trusted sources or professional tools.