About CoreCalx

Free online engineering calculators built by engineers, for engineers.

CoreCalx is a free online engineering calculator platform designed for electrical, mechanical, and civil engineers. Every tool is built to deliver fast, accurate results without bloated interfaces, signup walls, or intrusive ads.

Our Mission

To make engineering calculations accessible to everyone — from students learning circuit design to seasoned professionals sizing cables on the job site.

We believe the best tools get out of your way. No accounts to create, no premium tiers to unlock, no pop-ups between you and your answer.

Built by Engineers

CoreCalx is developed by a team with hands-on experience in electrical engineering and LED display systems. We understand the frustration of finding calculator tools that are slow, inaccurate, or buried in ads. That's why every calculator on CoreCalx is tested against real-world engineering standards.

Accuracy & Standards

Our calculators reference international standards including IEC 60364 for cable sizing, IEC 60062 for resistor color codes, and SI/ASTM for unit conversions.

Open & Free

All calculators on CoreCalx are completely free to use. No hidden fees, no account requirements, no feature gates.

CoreCalx is supported by non-intrusive advertising and will always remain free for users.