Contact Us

We read every message and typically respond within two business days. Since all tools run entirely in your browser with no server, we don't store or have access to your data — so please don't include sensitive information in your message.

Suggest a new tool

Tell us what calculator you'd like to see added. The most useful suggestions include a specific formula or use case — for example, "a calculator that converts between miles and kilometers for marathon pacing" or "a tool that estimates how long it takes to charge an EV based on battery size and charger type." I prioritize tools that either have real search demand (I check keyword data) or genuinely solve a problem I've run into myself.

Report a bug

Include the tool name, what you entered, what you expected to happen, and what actually happened instead. If possible, include your browser name and version (e.g. Chrome 125, Safari 18). Since every tool runs on your device, bugs are usually browser-specific rather than server-side, so that detail matters. A screenshot of the tool showing the incorrect result speeds things up significantly.

General feedback

We'd love to hear how CalcInstant helped you — or what you wish it did differently. Feedback on specific tools is the most actionable, but even a note about which tool you use most helps me decide what to improve next. If a tool saved you time or helped you make a decision, that's the kind of thing I build more of.

Partnership and licensing inquiries

Interested in embedding CalcInstant tools on your site, partnering, or licensing the calculator suite? Let me know the use case and scale you're targeting. Most of these conversations start with a brief email describing what you're building.

Email us at: hello@calcinstant.com

We aim to respond within 2 business days. Emails are typically answered within 24 hours during weekdays.

Before you contact us

Is a tool not working? Try a hard refresh (Ctrl+Shift+R / Cmd+Shift+R) first. Some tools cache an older version in your browser. If that doesn't fix it, clear your browser cache for calcinstant.com and reload.

Do you store my data? No. Every calculator runs client-side in your browser. Nothing is sent to our servers. Some tools save your last input to localStorage (your browser's local storage) so you don't lose your numbers on refresh, but that data never leaves your device.

Can I request a specific feature? Absolutely. Feature requests are the main driver of new tool development. If I can build it in under a few hours and it has genuine usefulness, I'll usually add it.