CALQENTRA is an engineering toolbox with 545 calculators across 32 engineering fields, including electrical, electronics, solar, mechanical, physics, 3D printing, civil, fluids, HVAC and robotics. Every result comes with a step-by-step worked solution, so you can see how the answer was reached, not just the number.

WHO IT'S FOR
• Practicing engineers who need practical calculations for everyday design work
• Engineering students who want to learn the method behind each answer
• Anyone curious about how engineering calculations work

CALCULATE
• Electrical calculations, including Ohm's law, watts, energy, voltage drop, cable sizing and PCB trace width
• PCB trace-width estimates based on current, copper weight, layer, temperature rise and voltage drop, with an IPC-2221 ampacity check and a recommended width
• Solar system calculations for loads, panels, batteries, inverters and cables, with a guided project wizard
• Mechanical calculations for torque, RPM, gears, friction and more
• Physics calculations for energy, motion, force, momentum and other fundamentals
• 3D printing cost and project calculations
• Tools and references across many additional engineering disciplines

SEE THE WORKING
• Step-by-step worked solutions: given values, governing equation, substitution and result
• Formula guidance for each calculator
• Design checks where they apply, such as ampacity and voltage drop for PCB traces

WORK YOUR WAY
• Use available calculators offline, including in the field
• Save favorites and review your calculation history
• Sign in to sync supported workspace data
• Upgrade to CALQENTRA PRO for additional calculators, saved projects, professional PDF reports and an ad-free experience

CALQENTRA is a calculation aid. Results are preliminary estimates and depend on the inputs and assumptions you provide. Verify critical designs, electrical installations, safety decisions and code compliance with qualified professionals and applicable local standards before construction or use.