About
One person, 21 tools
Calcxi is not a company. There is no team, no office, and no investor behind it. It is one developer who builds every calculator on this site, writes every guide, and answers every email personally.
I think anyone publishing numbers that people rely on should be findable. So here is exactly who I am.
Founder & sole developer
Aayush Kulshrestha
B.Tech Computer Science · 8 years in web development and SEO · Bhilwara, Rajasthan, India
21
Tools live
16
Written guides
8
Years experience
1
Person
Who Runs Calcxi
My name is Aayush Kulshrestha. I hold a B.Tech in Computer Science and I have spent the last eight years working in web development and search engine optimisation. I work as a freelancer and I am based in Bhilwara, Rajasthan, India.
Every tool on Calcxi was built by me. Every guide was written by me. Every email sent to support@calcxi.com is read by me. When something on this site is wrong, it is my mistake and I would much rather you tell me than quietly close the tab.
Education
B.Tech, Computer Science Engineering
Work
Freelance web developer & SEO consultant
Based in
Bhilwara, Rajasthan, India
Verify me
LinkedIn profile →Why I Started This
Eight years of building websites means I have opened a very large number of online calculators. The pattern was hard to miss: most of them were built years ago and never touched again. Layouts that break on a phone. Popups before you reach the input field. Results with no explanation of how they were reached.
What frustrated me was that the maths inside most of these tools is not difficult. The problem was neglect, not complexity. Someone built the tool once, it ranked, and then it was left alone while more ads were stacked on top of it.
I started Calcxi in May 2026 to do the opposite build the calculator properly, explain the method underneath it, keep the page fast and readable on a phone, and then keep maintaining it. That last part is the one almost everyone skips.
In practice this means every tool page explains the formula it uses, not just the answer. If you want to check my work by hand, the page should give you enough to do it. A calculator that will not show its method is asking for trust it has not earned.
How Tools Are Built & Verified
Before a calculator goes live on Calcxi, it goes through the same four steps every time.
Step 01 · Source the formula
The method comes from a published reference, never from memory. Standard textbook methods for mathematical tools, official documentation and government sources for anything involving rules or rates, and manufacturer or industry figures for cost estimators.
Step 02 · Cross-check the output
I run the same inputs through two or three established calculators and compare results. If my output disagrees, I find out why before publishing. Sometimes the other tool is wrong. Sometimes I am. I would rather know which.
Step 03 · Break it on purpose
Zero, negative numbers, very large values, empty fields, decimals where integers are expected. A calculator that silently returns nonsense is worse than no calculator at all.
Step 04 · Write the method out
If I cannot explain in plain language how a result was reached, the tool is not ready to publish. The explanation goes on the page, not in a footnote.
When a tool is updated or a mistake is corrected, the page's modified date changes. That date is not decoration it reflects a real edit. Our full standards are documented in the Editorial Policy and Calculator Accuracy Policy.
What Calcxi Is Not
I would rather be clear about the limits now than have you discover them at a bad moment.
Financial calculators here produce estimates for planning, not recommendations. Health tools use general population formulas that cannot account for your individual circumstances. For decisions that matter, speak to a qualified professional who knows your situation.
I am not a financial adviser, a doctor, or an attorney. I am a developer who builds carefully researched tools. Those are different things and I am not going to blur the line between them.
Construction and cost calculators use typical market ranges. Real quotes vary considerably by region, contractor, material choice and installation specifics. Treat the output as a starting point for a conversation, not a quote.
One person maintains this entire site. I test carefully, but mistakes are possible. If you find one, email me I will fix it and note the correction rather than quietly editing the page.
Full terms are set out in the Disclaimer and Terms & Conditions.
What Happens To Your Data
Different tools work in different ways, so here is the honest breakdown rather than a blanket claim.
Calculators
Every calculation runs entirely inside your browser. The numbers you type are never sent to a server, never logged, and never leave your device. You could disconnect from the internet after the page loads and they would still work.
Downloader tools
These work differently, and it would be dishonest to pretend otherwise. The public link you paste is sent to a server so the media can be fetched. Neither the link nor the file is stored afterwards, and no login or account details are ever requested or handled.
Accounts
There are none. Nothing on Calcxi requires a sign-up, and there is no user database to leak.
Analytics and cookie details are covered in the Privacy Policy and Cookie Policy.
What Is On The Site
Calcxi currently has 21 working tools and 16 written guides. Everything is free and nothing requires an account.
The range is wide because it grew from what people actually asked for. Someone emails about a calculation they cannot find a decent tool for, and if it seems genuinely useful, I build it. I would rather add tools slowly and maintain them than publish hundreds and abandon them.
Get In Touch
If a result looks wrong, a tool breaks on your device, or there is a calculator you need that does not exist yet — email me. It comes to me directly and I read everything.
Corrections are especially welcome. A calculator that quietly returns a wrong number is the worst thing this site could do so if you catch one, you are doing me a favour.
Signed
Aayush Kulshrestha
Founder and sole developer of Calcxi · Bhilwara, Rajasthan, India · Building since May 2026
Written & verified by
B.Tech Computer Science · 8 years in web development & SEO · Bhilwara, India
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