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Free Online Calculators

Quick everyday calculators for percentages, ages, discounts, and common numeric tasks.

Calculate percentages, percent of a number, and percent change.

Calculate age from date of birth.

Calculate sale price, discount amount, and savings.

Why use browser-based tools?

Many tools avoid upload and download wait time by running directly in your browser.

CompressFree labels whether a tool runs locally or needs server-side processing.

Client-side text, image, and QR tools can continue working after the page is loaded.

Choose a tool above

Start with the focused task page, then move between related tools.