Top 5 Most Popular Calculators on Our Website

08/21/2025

In a world where every second counts, quick and accurate calculations are priceless.

Our website offers an impressive collection of 49 free engineering calculators designed to speed up your work.

Today, we want to share the most popular tools that have already earned the trust of our users:

Top 5 Most Popular Calculators on Our Website

1. Duty Cycle Calculator

What it does: Calculates duty cycle and pulse width parameters – super-fast and easy to use.
Practical application: Ideal for engineers working with PWM, digital signals, and RF circuits to determine the percentage of time a signal stays high.

2. Capacitor Color Code Calculator

What it does: Decodes capacitance, tolerance, temperature coefficient, and max voltage from a capacitor’s color bands.
Application: Convenient for reading old components or PCBs without printed values – just enter the colors to get the exact value.

3. LM317/LM350/LM338 voltage regulator or current limiter calculator

What it does: Calculates resistor values needed for a stable output voltage or current limit with LM-series regulators.
Application: Great for both DIY makers and pro engineers to quickly select components for power supplies and current limiters.

4. RGB LED Resistor Calculator

What it does: Calculates the correct resistor value for safe RGB LED use, including resistor color code and power rating.
Application: A must-have for LED lighting projects – helps prevent overload and overheating.

5. Transformerless Power Supply Calculator

What it does: Calculates the required capacitor value for transformerless power supply circuits to step down AC voltage.
Application: Useful for designing compact devices without transformers – but be careful: no galvanic isolation means safety precautions are a must!

More Multifunctional engineering calculations of electronic circuits and components