About MegaCalc

Our Mission

MegaCalc exists to make unit conversion and engineering calculation fast, accurate, and universally accessible. Too many conversion tools are cluttered with ads, require account signups, or produce inaccurate results from outdated conversion factors. We built MegaCalc to be the tool we wished existed: clean, instant, and trustworthy. Every conversion factor is sourced from authoritative international standards — SI, NIST, ISO, and BIPM — so you can rely on the results for professional and academic work.

What is MegaCalc?

MegaCalc is a free, fast, and comprehensive online unit converter and calculator. We cover length, weight, temperature, speed, volume, area, time, data storage, energy, pressure, currency, and dozens of engineering and scientific categories — with 12,522 conversion pairs (unit, currency and crypto) across 49 categories. Our calculator library covers the full scope of undergraduate mechanical engineering: statics, dynamics, mechanics of materials, thermodynamics, fluid mechanics, heat transfer, machine design, materials science, and manufacturing, alongside everyday calculators for finance, health, and daily life. All tools are free to use, require no account, and work entirely in your browser.

What We Offer

Our converters cover 49 categories, including length, weight, temperature, speed, volume, area, pressure, energy, power, frequency, angle, fuel economy, torque, force, density, viscosity, heat transfer, and many specialized engineering quantities. The currency converter supports 89 world currencies with live exchange rates updated hourly, and the cryptocurrency converter covers 25 digital assets with live pricing. We also provide unit comparison pages and category guides with detailed explanations of measurement systems and conversion techniques.

Who MegaCalc Is For

• Students — Verify homework calculations, convert between metric and imperial units, and use formula-based calculators to understand how engineering equations work with real numbers.
• Engineers and scientists — Look up conversion factors across dozens of technical categories, perform quick preliminary calculations before running detailed simulations, and check units on data from international sources.
• Healthcare professionals — Convert between US customary and metric measurements for dosing, lab values, and patient data from international sources.
• Travelers and expats — Convert currencies with live exchange rates, convert temperatures and distances between metric and imperial, and compare clothing and shoe sizes across countries.
• Developers and designers — Convert color codes between HEX, RGB, HSL, and CMYK; convert between binary, hexadecimal, octal, and decimal; encode and decode URL, Base64, and HTML entities.
• Finance professionals — Calculate mortgage payments, compound interest, discount rates, and sales tax; convert currencies for cross-border pricing and financial reporting.

Technology

MegaCalc is built as a modern web application using Next.js with server-side rendering, ensuring that pages load fast and search engines can index all content. Calculations and conversions execute entirely in the browser using JavaScript, with no round-trips to a server: most results update as you type, and a few heavier calculations (such as refrigerant property solves) run in a background worker and show their result when it is ready. Currency exchange rates and cryptocurrency prices are fetched via our API layer and cached server-side, then delivered to your browser without exposing third-party API keys. The site is statically generated at build time for most pages, with incremental static regeneration for live-data pages, giving you both speed and freshness.

Our Principles

• Free forever — All tools on MegaCalc are completely free to use. No paywalls, no premium tiers, no subscriptions.
• No signup required — Use any converter or calculator instantly, with no account, no login, and no email address needed.
• Instant results — Conversions update in real time as you type — no need to press a submit button.
• Accurate — Conversion factors are sourced from official international standards (SI, NIST, ISO, BIPM) and are regularly reviewed for correctness.
• Privacy-first — We do not track individual searches, store your calculation inputs, or sell personal data. See our Privacy Policy for full details.

Who Built MegaCalc

MegaCalc was founded by Christopher Floied, a mechanical engineer (BSME), to build the engineering reference site he wished existed during his coursework and early career. Christopher architects the engineering methodology — selecting which formulas to publish, choosing which authoritative references to cite, specifying acceptance criteria for accuracy, and reviewing the verification process documented on the Methodology page.

Day-to-day calculator implementation, content writing, and unit conversion tooling are produced by the MegaCalc team using the engineering methodology Christopher has set. Calculators in core mechanical engineering domains (statics, dynamics, thermodynamics, fluid mechanics, heat transfer, machine design) carry Christopher’s direct review of the underlying formula and citations.

Calculators are implemented from published formulas in authoritative engineering references — Marks’ Standard Handbook, Perry’s Chemical Engineers’ Handbook, Shigley’s Mechanical Engineering Design, Hibbeler’s Statics & Dynamics, Çengel’s Heat & Mass Transfer and Thermodynamics, plus relevant ASME, ASTM, ISO, and NIST standards. The Methodology page explains how they are checked: which tools are tested against worked examples and reference data, and where those checks stop.

MegaCalc is an independent project, not affiliated with any university, textbook publisher, or equipment manufacturer. The site is funded by display advertising and all tools are provided free to the engineering community without signup or paywall.

Contact

Have a suggestion, found a bug, or want to request a new converter or calculator? We welcome feedback from users — it helps us prioritize improvements and catch errors. Email us at christopherfloied101@gmail.com or visit our Contact page.

Other Tools by Christopher

MegaCalc is one of a small family of tools built by the same author. Same principles run through all of them: free where free makes sense, do one thing well, no signup, no watermarks, no stored personal data. Full bio and portfolio on the author page.

Free web tools

• MegaConvert — Free online file converter — 157+ formats, 2,600+ pairs, no signup.
• MegaText — Free online developer tools — 160+ utilities, instant results.

iPhone apps

• FieldCalc Pro — Code-compliant trade calculators for electricians, HVAC techs, and contractors.
• Moneta AI — AI coin scanner — identify, grade, and value any coin or banknote.
• WordBrew — Cozy tea-themed word puzzle game — 250 levels, ambient sounds, beautiful themes.
• Blox Breaker — Neon block-breaking arcade game — 400+ levels across 8 worlds.

B2B work

• Bytecove Software — Custom internal systems, AI integrations, and workflow automation for service-based organizations.