FAQ

Are the tools free?

Yes. Calculators, converters, Dev tools, and Apps on CalculatorX are free to use in your browser. No account is required.

Do my numbers leave my device?

Interactive tools on CalculatorX are designed to run locally in your browser. Your inputs stay on your device for the calculation itself. See the Privacy Policy for analytics and advertising details.

How accurate are the results?

We publish formulas, assumptions, units, and boundary conditions on calculator pages so you can verify the method. Check Calculation status for engine tested vs expert reviewed. Details: Review policy. Results are for educational and informational use—always double-check critical engineering, financial, or safety-related work independently.

What does “verified” mean?

verified means expert reviewed by an identified reviewer or review team (reviewedBy)—not only automated tests. Most live tools are engine tested. See Review policy and the sample Ohm’s Law page.

What is the difference between Calculators, Converters, Dev, and Apps?

How do I find a tool?

Press ⌘K (or the search icon), use the homepage search field, or browse Calculators, Converters, Dev, and Apps.

On the homepage you can type a short sentence such as 12 A 230 V to VA or loan 250000 at 6.5% for 30 years. When the phrase is recognized, CalculatorX opens the matching tool and fills the inputs from the numbers you typed.

Can I use CalculatorX for work or school?

Yes, for learning, checking homework, and everyday professional estimates—subject to our Terms of Use. Do not treat any single result as a certified engineering or financial opinion.

Is there a calculation API?

Yes — a public beta. Send POST /api/v1/calc/:id with { "inputs": { … } }. Responses include the raw result plus formula, assumptions, warnings, and verification. See CalculatorX Developers for Quick start, REST engine ids, and curl examples. Results match the same deterministic engines used on calculator pages.

Can I export results or see history?

On calculator and converter pages, use the icons in the result panel: Copy link (shareable URL with inputs), Download CSV (result snapshot), and History (recent calculations stored only in this browser’s local storage—not uploaded).

Can I embed a calculator on my site?

Yes — a public MVP for selected electrical and finance tools. Use an iframe pointing at /embed/{slug} (for example /embed/electric/ohms-law). On allowlisted pages, open the result panel’s Embed control (<>) for the iframe snippet and Copy embed code.

Optional white-label query params: theme=light|dark, accent=#RRGGBB, brand=YourName (attribution becomes “Powered by YourName · CalculatorX”; the CalculatorX link always remains). Full white-label without CalculatorX branding is not available yet. Details: Embed.

How do agents or MCP clients call CalculatorX?

Prefer Remote MCP at POST /mcp with search_capabilities → inspect_capability → execute_calculation (free). Paid SKUs may use compute_paid (Stage 0.5; not live charging). Or call POST /api/v1/calc/:id directly. Catalogs: /.well-known/calculatorx-capabilities.json, /.well-known/agent-tools.json. See the agent guide for when to call, version pinning, and how to read assumptions without overclaiming. Protocol notes: MCP.