About EngineeringTools
About EngineeringTools: 16 free engineering calculators and guides - bolt torque, metric threads, water pressure, resistor codes, LAN cabling and HVAC.
Our Mission
EngineeringTools was created to provide simple, fast, and free engineering calculators that anyone can use without registration or downloads. We believe essential tools should be accessible to everyone.
What You'll Find Here
The hub covers the everyday calculations engineers and technicians actually need: a bolt torque calculator and metric thread chart for mechanical work, a water pressure calculator, water flow calculator and pipe sizing for plumbing and civil jobs, a resistor color code chart and capacitor calculator for electronics, an Ethernet LAN cabling guide with the RJ45 T568A/T568B pinout for network installs, and a complete HVAC section with refrigerant GWP data, side-by-side refrigerant comparison and a CO2 emissions calculator. Every tool runs locally in your browser — no data is ever uploaded.
Why Choose Us?
- 100% Free — No signup, no hidden costs
- Privacy First — All calculations run in your browser
- Fast — Loads instantly on any device
- Mobile Friendly — Works perfectly on phones and tablets
- Minimal Ads — Non-intrusive advertising keeps us free
Contact
Have feedback or found a bug? Visit our contact page.
About 2K3D s.r.o.
This website is operated by 2K3D s.r.o., a company registered in the Czech Republic (Company ID: 09124497). For more information, visit the company registry entry.
Frequently Asked Questions
Are the engineering calculators free to use?
Yes. Every calculator and reference chart on EngineeringTools is free with no signup and no usage limits. Non-intrusive advertising keeps the hub free for everyone.
Are the results accurate enough for real engineering work?
The calculators use standard engineering formulas (for example P = ρgh for hydrostatic pressure and standard torque coefficients for bolted joints) and are excellent for design checks, study and everyday estimation. For safety-critical or certified work, always verify results against the applicable standard and a qualified engineer's review.
Do the calculators work with imperial units?
Most calculators accept SI units, and several — like the water pressure and water flow calculators — include unit switching between metric and imperial. The bolt torque calculator covers common metric bolt sizes from M3 to M42 with typical friction coefficients.
Does anything I enter get sent to a server?
No. All calculations run locally in your browser with JavaScript. Your inputs never leave your device — nothing is uploaded, stored or logged.
Can I use the calculators on my phone or tablet?
Yes. Every EngineeringTools calculator is fully responsive and works in any modern mobile browser — no app or installation required, even on site or in the workshop.
Is there a metric thread chart included?
Yes. The metric threads reference covers standard ISO coarse and fine pitches with tapping drill sizes — right next to the bolt torque calculator for the matching fastener data.