Frequently Asked Questions

No — never. All calculations happen locally in your browser using JavaScript. Nothing you compute is sent to any server. Close the tab and everything is gone. We have no database, no server-side logic, and no way to see what you calculate.

Yes — we collect basic data about how the site is used, like which pages are visited and how visitors navigate around. We also record browsing sessions on the site to help us spot usability issues and improve the experience. Your calculations are never captured in any of this.

The calculator logic is transparent and runs entirely in your browser — you can inspect every line via your browser's DevTools. We believe in being auditable by design.

Yes! Click anywhere on the page first to focus it, then type freely. Full keyboard mapping:

• 0–9 — digit input
• . — decimal point
• + - * / — arithmetic operators
• Enter or = — calculate result
• Escape or C — clear all (AC)
• Backspace — delete last digit
• % — percentage

The percent button behaves contextually. If you press 200 × 15%, it calculates 15% of 200 (which is 30). If you press 50% with no prior operator, it divides by 100, giving you 0.5.

Yes — CalcNow supports chained operations. Type 5 + 3 × and it will first compute 5 + 3 = 8, then apply the multiplication to the result. The history line above the display always shows what's being computed.

CalcNow handles division by zero gracefully and displays Error rather than throwing an unhandled exception. Press AC to reset and keep going.

Once the page has loaded, the calculator works entirely without an internet connection. If you bookmark the page, your browser will cache the assets and serve them even with spotty or no connectivity.

Absolutely. CalcNow was designed touch-first with large tap targets (80×80px per button) and a fully responsive layout. It works great on phones, tablets, and desktops without any pinching or zooming.

We're considering it! Scientific mode with trigonometric functions, logarithms, and exponents is on our roadmap. For now we're focused on making the standard calculator as polished and reliable as possible.

Yes. The calculator uses semantic HTML with ARIA roles, labels, and live regions. The display announces results automatically, and every button has a descriptive aria-label. The color contrast meets WCAG AA standards.

Yes — always. No subscription, no premium tier, no ads. CalcNow is a free tool built for everyone who needs a reliable, no-nonsense calculator in their browser.

Use the feedback form at the bottom of any page, or reach us directly via the links in the footer. We read everything and take bug reports seriously.