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Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

Percentage Calculator

Calculate percentages, percentage of a number, and increases.

FreeRuns in browserpercentage calculatorpercent calculator
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Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About Percentage Calculator

Calculate percentages, percentage of a number, and increases. Calculate percentages, percentage of a number, and percentage change online for free. Instant results with inverse percentage calculation for any value pair. Uses precise mathematical formulas with clear, formatted results. Input validation prevents errors and guides correct usage, ensuring reliable computations every time. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: Percentage Change Calculator, Discount Calculator, Profit Margin Calculator

How to Use Percentage Calculator

  1. Fill in the required input fields with your values.
  2. Click Calculate to run the computation.
  3. View the results below the form.

Frequently Asked Questions

What is Percentage Calculator?
Calculate percentages, percentage of a number, and percentage change online for free. Instant results with inverse percentage calculation for any value pair.
How are calculations performed?
Calculations use precise mathematical formulas implemented in JavaScript. The underlying formulas are well-documented and validated against known reference values to ensure correctness.
Can I use decimal values?
Yes, all input fields accept decimal numbers with full floating-point precision. You can enter values with as many decimal places as you need and the tool will compute accurate results.
Are the formulas used shown?
Where applicable, the tool displays the formula or methodology used so you can verify the computation yourself. This transparency helps you understand and trust the results.
Is Percentage Calculator free to use?
Yes, this calculator is completely free to use. No account or signup is needed, and all computations run locally in your browser without any restrictions.
Is my data safe when using Percentage Calculator?
Absolutely. Every calculation runs locally in your browser. No input data is transmitted to any server, ensuring your numbers stay private.

Related Tools

Percentage Change Calculator
Calculate percentage increase or decrease between values.
Discount Calculator
Calculate sale price after discount percentage.
Profit Margin Calculator
Calculate profit margin, markup, and gross profit.