About Us — LCM Calc

"Math should never feel like a barrier. Our mission is to make every calculation fast, accurate, and accessible — regardless of where you are or what language you speak."

The LCM Calc Team

Our Story

How we got here

A short journey through the moments that shaped LCM Calc into the tool it is today.

ORIGIN

A classroom problem

LCM Calc started as a small side project to help students who struggled with the "cross-check" step of finding least common multiples. The first version was 200 lines of plain JavaScript — no framework, no polish, just a working algorithm.

EXPANSION

From integer to everything

We added support for fractions and decimals, then extended the number range to 10²⁴ using BigInt and Pollard's rho factorization. What began as a simple classroom aid became a serious mathematical tool.

GLOBAL

Breaking language barriers

We translated the entire interface into 19 languages, including full right-to-left support for Arabic and Urdu. Math has no borders, so neither should its tools.

TODAY

Private by design

Everything runs locally in your browser. No accounts, no tracking, no data sent to any server. LCM Calc is built on the belief that learning tools should respect the people who use them.

What We Offer

Every feature, purpose-built

Carefully designed features that solve real problems — not flashy extras that get in the way.

Exact BigInt Arithmetic

No floating-point errors. Every result is computed with arbitrary-precision integers so the answer is always mathematically exact.

Detailed Step-by-Step

Prime factorization, highest-power table, GCD cross-check — every step is shown in a clean, readable format so you can learn, not just copy.

Fractions & Decimals

Enter rational numbers with a/b notation, or decimals like 0.5 and 1.25. The calculator handles both seamlessly with exact fraction math.

19 Languages

Full interface translation with right-to-left support for Arabic and Urdu. Auto-detects your browser language on first visit.

Voice Input

Speak your numbers using your browser's native speech engine. Perfect for hands-free or accessibility-focused use cases.

Export & Share

Download a branded PNG of your result, save as PDF, or generate a shareable link with your calculation pre-filled.

Complete Privacy

All calculations run 100% locally in your browser. No accounts, no cookies for tracking, no data ever sent to a server.

Install as an App

Add LCM Calc to your home screen as a Progressive Web App. Works offline and loads instantly, just like a native application.

Our Values

The principles we build on

Four commitments that shape every decision we make.

01

Accuracy First

Mathematical correctness is non-negotiable. We use arbitrary-precision arithmetic and cross-verify our results with two independent methods before they're shown to you.

02

Privacy by Default

We never collect personal data, and we never will. Every calculation happens in your own browser — nothing leaves your device. No analytics scripts, no third-party tracking.

03

Accessible to All

Free forever, mobile-first, screen-reader friendly, keyboard navigable, and translated into 19 languages. Great tools should be available to everyone, everywhere.

04

Simplicity Wins

Every feature earns its place. No sign-ups, no popups, no ads, no clutter. Just a fast, focused tool that does one thing exceptionally well.

Technology

Built with modern, dependency-free web technology

LCM Calc runs as a single-page application with zero external libraries, zero build steps, and zero backend. Every algorithm is written from scratch and runs entirely in your browser — no frameworks, no trackers, no server calls.

JS

Vanilla JavaScript

No frameworks — just clean, modern ES2020 code.

BigInt Arithmetic

Arbitrary-precision integers for exact math.

Pollard's Rho

Fast prime factorization of huge numbers.

Miller-Rabin

Deterministic primality test up to 10²⁴.

Web Speech API

Voice input powered by your browser.

PWA Ready

Installable, works offline, loads instantly.

Your privacy is not negotiable.

We built LCM Calc on a simple promise: everything you type stays on your device. There is no backend. There is no user database. There is no way for us to see your calculations even if we wanted to.

All math runs locally in your browser — nothing is uploaded.
No accounts, no sign-ups, no email required.
No third-party trackers, analytics, or advertising scripts.
History is stored only in your browser's localStorage — clear it any time.
You can save the calculator and use it entirely offline.

Get in Touch

We'd love to hear from you

Found a bug? Have a feature idea? Just want to say hi? Here's how to reach us.

Email Us

General questions, feedback, or partnership inquiries. We reply within 1–2 business days.

hello@lcmcalc.com

Report a Bug

Found something wrong? Tell us the input and the expected result — we'll investigate and fix it fast.

Open a report

Suggest a Feature

Have an idea that would make LCM Calc better? We love thoughtful suggestions from real users.

Share your idea

Support the Project

LCM Calc is free and always will be. If it helped you, sharing it with a friend is the best thank-you.

Share with others

FAQ About Us

Common questions

Quick answers about LCM Calc, our mission, and how we work.

Is LCM Calc really free?

Yes — completely free, and it always will be. There are no premium tiers, no account requirements, no ads, and no hidden limits. Every feature is available to every user.

Do you collect any of my data?

No. LCM Calc runs entirely in your browser. We have no backend server, no analytics, no cookies for tracking, and no way to see what you calculate. Your history is stored only in your own browser's local storage and can be cleared at any time.

How do you make money if it's free?

We don't — and that's intentional. LCM Calc is a passion project. We cover the (very low) hosting costs ourselves because we believe educational tools should be free and accessible to everyone.

Can I use LCM Calc offline?

Yes. LCM Calc is a Progressive Web App (PWA), which means you can install it to your home screen or desktop and use it completely offline. All calculations work without an internet connection.

What's the largest number I can calculate with?

Effectively unlimited. We use BigInt arithmetic, which can handle integers of any size. For prime factorization, we use Pollard's rho algorithm and can factor numbers up to around 10²⁴ exactly. Beyond that, the calculator still returns exact results — it just skips the factorization display step.

Which languages are supported?

19 languages: English, Hindi, Spanish, Russian, French, German, Italian, Portuguese, Bengali, Japanese, Korean, Malay, Polish, Indonesian, Arabic, Bulgarian, Turkish, Swedish, and Urdu. Arabic and Urdu include full right-to-left layout support.

Can I embed LCM Calc on my own website?

Yes. LCM Calc is a single HTML file with no dependencies, so it can be embedded anywhere. If you're a teacher or educational site owner and want to include it in your materials, just reach out and we'll be happy to help.

Who built LCM Calc?

A small team of educators, mathematicians, and software developers who believe good tools should be fast, private, and accessible to everyone — regardless of language or location. We work on this in our free time.

Ready to try it?

Jump back into the calculator and see why students, teachers, and professionals around the world rely on LCM Calc.

Open Calculator Explore Features

Built by educators, for learners everywhere.