About WebToolGrid
WebToolGrid is a small, focused collection of free calculators and browser tools built for one job: giving a fast, correct result for a specific everyday task — without an account, a download, or a wall of ads before you reach the tool.
Every calculator runs entirely in your browser. The numbers you type are not sent to our servers or stored — the JavaScript that computes your result is the same code your browser downloaded when the page loaded. The only thing the site reports back is limited error and diagnostic information so we can fix bugs; our Privacy Policy lists exactly what is sent.
Who runs WebToolGrid
WebToolGrid is built and maintained by Ranveer Singh Sidhu, a full-stack .NET developer, as a small independent project. You can reach the site through the Contact page.
What's on the site
63 calculators and converters (finance, health, everyday math, unit conversion and more) and 74 browser tools for PDFs, images, text, audio, video and developer tasks. Each page explains what the tool does and where its limits are, and there are a few guides for the most common tasks.
How we build a calculator
Each tool starts from a standard, publicly documented formula (for example, the reducing-balance EMI formula banks use, or the compounding formula behind SIP projections). We compare results with worked examples, and we explain the formula on the same page as the tool so you can verify the logic yourself rather than take the output on faith. That checking has been done most thoroughly for the finance and health calculators — including EMI, SIP, mortgage, FD, RD, PPF, GST, BMI and BMR — whose results were recalculated independently, by a separate calculation rather than the calculator's own code. Not every calculator has had that level of checking. Pages that depend on published rates or rules, such as PPF, FD, RD and GST, show a "Last reviewed" date, and their rates are never looked up automatically: you enter the rate that applies to you. The currency converter uses a free public exchange-rate dataset that is refreshed each time the site is rebuilt, not live, and shows the date of the rates it is using.
How we test the tools
The file tools use established open-source libraries rather than custom file-format code — for example pdf-lib and PDF.js for PDFs, Tesseract.js for OCR, JSZip and libarchive for archives, and FFmpeg compiled to WebAssembly for video. After changes to the site we build it and load every page in a headless Chromium browser at phone width to catch errors and layout overflow. Several of the PDF tools have also been run end to end with sample files, and their output checked, but not every file tool gets that treatment each time. All of this testing has been done in Chromium only; behavior in Firefox and Safari has not been tested. If a tool misbehaves in your browser, please tell us which one you use.
Sources
Formulas come from standard, publicly documented definitions, and the page for each calculator explains the one it uses. Where a page relies on an outside source, it says so: for example, the WHO adult BMI categories, the Mifflin–St Jeor equation for BMR, the Devine formula for reference body weight, the Department of Economic Affairs' quarterly notification for the PPF rate, and the GST Council's and CBIC's notifications for GST slabs.
How the site is funded
WebToolGrid is supported by advertising served through Google AdSense. Ads are labeled "Advertisement", sit apart from the tools, and have no influence on any calculation or result.
What we don't claim
WebToolGrid is not a financial advisor, a bank, or a fund house. Calculators like EMI and SIP produce estimates based on the numbers you provide and standard formulas — they don't account for a lender's specific fees, a fund's actual historical performance, or your personal financial situation. See our Disclaimer for details.
Feedback and corrections
If you spot a calculation that looks wrong, or you'd like to see a calculator we don't currently offer, we'd genuinely like to hear about it — see the Contact page.