Frequently asked questions

Yes. Every calculator on the site is free to use, with no signup, no paywall, and no usage limits. The site is supported by Google AdSense — you may see ads, but the tools themselves stay free.

No. Every calculator runs entirely in your browser using JavaScript. The values you enter — income, weight, loan amount, etc. — never leave your device and are never sent to our servers.

For each calculator we publish the formula we use and link to a primary source — RBI / Income Tax India for finance, WHO / ICMR for health, peer-reviewed sources for math. We also list the limitations of each tool. Results are good enough to make planning decisions, but for legally or medically important decisions you should still consult a qualified professional.

Yes — the finance calculators (income tax, EMI, SIP, GST, PPF, HRA, etc.) assume Indian rules and rupee inputs by default. The income tax calculator supports both the new and old regimes for FY 2025-26 / AY 2026-27. You can switch currency in the navigation bar for non-India calculations where the math is currency-neutral (compound interest, loan payment, etc.).

AllSmartCalculators is built and maintained by Ankit Gupta, a data analyst based in India. Every calculator is hand-coded and reviewed against textbook references and primary sources. You can read more on the author page.

Email allsmartcalculators@gmail.com or use the contact form. We log every reported issue and publish corrections on the corrections page. Please include the calculator name, the inputs you used, and what you think the correct result should be.

Ads from Google AdSense pay for the site. We use Google Consent Mode v2, so until you accept the cookie banner, AdSense receives a "denied" signal and serves only non-personalized ads. You can also opt out of personalized advertising at adssettings.google.com or youronlinechoices.com (EU).

Absolutely. Use the contact form, pick "Suggest a calculator", and tell us what you want and what inputs/outputs you expect. We prioritize calculators that solve common India-finance, health, or daily-life questions.

Once a calculator page has loaded, the calculations themselves work offline because they run in your browser. The site is optimized for fast loads on mobile networks — most pages clock in under 100 KB of JavaScript.

Not yet — we plan to release official embeds in a future update. For now, please link to the calculator page rather than copying its code; that way users always get the latest formula and we can fix bugs centrally.