Free Client-Side Tool

Percentage Calculator

Solve percentage increases, decreases, discounts, and fractions instantly.

Runs locally in your browser.

45 is what percentage of 300?

15.00%

45% of 300 is:

135.00

How to use this tool

  1. 1Select your calculation mode (percentage increase, decrease, or share of total).
  2. 2Enter the base numbers.
  3. 3Copy the precise rounded result with one click.

Common scenario

Rapid daily tool for discount checks, tax additions, and monthly growth calculations.

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No account, sign-in, or cookies required. You can bookmark and use this utility offline.

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Frequently Asked Questions

Does it support negative growth calculations?

Yes, it calculates negative deltas and decreases automatically.