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LumoCalculator is a growing library of free online calculators designed for everyday life and professional workflows. Youโll find finance tools (mortgage, loan, interest, ROI), health & fitness (BMI, BMR, body fat), math & science (algebra, statistics, geometry), engineering utilities, and a wide range of unit converters. Why users choose LumoCalculator
Accurate formulas and clear, step-by-step outputs
Fast, mobile-first UI with accessibility in mind
No sign-up; results can be copied, shared, or reset in one click
Categories, search, and SEO-friendly pages for each tool
Multilingual roadmap (EN first; more locales coming) Who itโs for: students, homeowners, teachers, developers, small businesses, and anyone who needs reliable calculations in seconds. Build your workflow with trustworthy calculators you can bookmark and use anywhere.
A Free Open Calculator, Easy and Quick , and Full Screen!
LumoCalculator Open CalculatorNo features have been listed yet.
LumoCalculator's answer
Next.js (React) with TypeScript, styled with Tailwind CSS. Serverless/edge rendering on a global CDN, with lightweight pages and no cookie-based tracking. Automated tests and schema-based validation keep formulas consistent across calculators.
LumoCalculator's answer
You get accurate results in seconds with no signup and ad-light pages. Formulas are transparent and referenced, and every calculator follows the same clean UXโso thereโs zero learning curve. We actively ship new calculators and improvements from user feedback.
LumoCalculator's answer
We started LumoCalculator after getting frustrated by slow, ad-heavy calculators that hide their math. Launched in 2025, our goal is to make trustworthy calculations instant, transparent, and accessible to everyoneโon any device.
LumoCalculator's answer
(Weโre a free public utility used by individuals and teams; we donโt publish customer names. Representative user groups include:)
University students, TAs, and tutors
Personal-finance educators & bloggers
Mortgage and loan officers
Fitness coaches & health practitioners
Engineers and product teams at small businesses
LumoCalculator's answer
LumoCalculator is a fast, privacy-first library of professional-grade calculators for everyday and work use. We show clear inputs, step-by-step outputs, and the formulas behind the results so users can trust the numbers. The UI is consistent across finance, health, math, and unit conversionsโkeyboard-friendly and mobile-native with no pop-ups or dark patterns.
LumoCalculator's answer
Three groups: (1) everyday users who need quick answers, (2) students and teachers who want clear, checkable steps, and (3) professionalsโengineers, finance and mortgage pros, healthcare & fitness coaches, and small-business owners.
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