7 Must-Have Online Calculators for Engineering Students

09/11/2025

Engineering Students’ Toolkit: 7 Fast and Accurate Calculators

We’ve selected the 7 most useful calculators that you should definitely bookmark:

1. Duty Cycle Calculator – quickly calculates duty cycle and pulse parameters, essential for working with PWM signals, digital circuits, and RF chains.
2. Capacitor Color Code Calculator – makes capacitor color-band decoding easy, including tolerance, temperature coefficient, and rated voltage.
3. LM317/LM350/LM338 Voltage Regulator or Current Limiter Calculator – computes resistor values for stable voltage or current limitation with LM regulators — a must for power supply and DIY projects.
4. RGB LED Resistor Calculator – determines the correct resistor for RGB LEDs, considering power and resistor color codes — so your LEDs won’t burn out.
5. Transformerless Power Supply Calculator – calculates the capacitor value for transformerless power supplies: compact and efficient, but with safety considerations.
6. 3-Phase Calculator – solves parameters for balanced three-phase star and delta connections — a vital tool for electrical engineering and power system tasks.
7. Ohm’s Law Calculator – the classic tool to calculate current, voltage, resistance, and power (P=IV). Still the foundation of every electronics project.

Why are these calculators a must-have for engineering students?

• Speed and accuracy: results in seconds, not minutes of manual formula crunching.
• Versatility: from color codes to three-phase circuits — covering the full spectrum of common tasks.
• Convenience: intuitive interface, visual hints, and clear results.
• Educational & practical value: useful for lab work, exams, hobby projects, and even your thesis.

More Multifunctional engineering calculations of electronic circuits and components