Calculate percentages instantly with multiple modes. Free percentage calculator for discounts, tips, grades, and more.
The Percentage Calculator is an essential utility for anyone who needs quick, accurate calculations without installing software. In 2026, as remote work and digital workflows dominate, having instant access to reliable calculation tools in your browser saves time and eliminates errors.
Whether you're a student verifying homework, a professional preparing reports, or someone managing personal finances, our tool provides instant results with zero learning curve. Built with privacy-first technology, all calculations happen locally in your browser→your data never leaves your device.
Most percentage questions fall into three types: "what is X% of Y," "X is what percent of Y," and "what is the percentage change from X to Y." Each requires a different formula. This calculator handles all three in one place so you don't have to remember which equation to use.
Percentage change is the one that trips people up most — the formula is (new − old) / old × 100, and the sign matters. A drop from 80 to 60 is −25%, not −20%; the denominator is always the starting value, not the ending one.
Runs in your browser, no signup required.
No downloads, no installations, no waiting. Get results the moment you click calculate, powered by your device's processor.
Your data stays on your device. We use client-side processing only→no data collection, no tracking, complete privacy.
Responsive design that works flawlessly on phones, tablets, laptops, and desktops. One tool, all your devices.
No premium tiers, no paywalls, no credit cards. Every tool on AllOmnitools is completely free for personal and commercial use.
Yes, absolutely. All tools on AllOmnitools are 100% free with no hidden costs, premium versions, or subscription requirements.
No registration is required. Just visit the page and start calculating immediately. We believe tools should be accessible to everyone without barriers.
No. All calculations happen locally in your browser using JavaScript. Your data never leaves your device, and we never see, store, or log your inputs or results.
Once the page is loaded, the calculator works without an internet connection. The calculations are performed entirely on your device.
Our calculators use standard mathematical formulas and algorithms that match professional-grade software. Results are accurate to multiple decimal places.
Yes! AllOmnitools tools are free for both personal and commercial use. Use them for your business, freelance work, or academic projects.
Our tools work on all modern browsers including Chrome, Firefox, Safari, and Edge. The responsive design adapts to any screen size from mobile to desktop.