Percentage calculator

Pick a mode then calculate

    GuideHow to Solve Common Percentage Calculations

    Calculate a percentage of a value, percentage change, discounts, markups, and reverse percentages.

    Read guide →
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    Frequently asked questions

    How to calculate percent of a number
    Multiply the number by the percent, then divide by 100.
    What is percent increase
    Change divided by original, then multiply by 100.
    What is reverse percent
    Given final value and percent increase, find the original amount.
    How to compute discount price
    Final price equals price minus price times discount percent divided by 100.
    Do you round values
    Two decimals by default for readability.
    Can I chain percentage changes
    Handle single step per run, repeat for more steps.
    Is this free to use
    Yes, free on KitBeam.
    Why do I get NaN
    Make sure inputs are numeric and filled.
    Do you store my inputs
    No, everything runs in your browser.
    Can I share a screenshot
    Yes, use the button.
    What does the Percentage Calculator do?
    Calculate percentages, percentage change, reverse percentages, and discount amounts.
    How should I interpret a Percentage Calculator result?
    Read the displayed labels and validation messages together, then verify important findings against the original source. The result is a practical aid, not proof beyond the data it can inspect.
    What can affect the Percentage Calculator result?
    Inputs, source data, network conditions, and the limits explained on the page can affect the result.
    Where can I learn more about using the Percentage Calculator?
    Read “How to Solve Common Percentage Calculations” for a practical workflow, limitations, and checks to make after using the tool.