Power Calculators

x% Percentage Equation Calculator

Find the unknown amount when a percentage relationship is known.

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Also available in our Android app, with charts and full breakdown tables.

📘 About the Percentage Equation

A simple algebraic percentage relationship written as an amount from a percentage and whole.

🧮 Formula

Where

  • percent = percentage value
  • whole = reference amount
  • amount = resulting part
amount = percent × whole / 100.

✏️ Worked example

25% of 200

You enter
Percentage25
Whole200
You get
Percentage amount50

The result is 50.

Try this example →

🧭 How to use this calculator

What you enter

  • Percentage
  • Whole

What you get

  • Percentage amount

💡 Common uses

  • Discount calculations
  • Tax and markup calculations
  • Percentage-based algebra exercises

❓ Frequently asked questions

Is 25 entered as 25%?

Yes. Enter 25 for 25 percent.