Engineering Tools &
Calculators
Professional-grade calculators for electronics design, circuit analysis, and mechanical engineering. 100% free, accurate, and easy to use.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Essential for circuit design and electrical engineering calculations.
Resistor Color Code Calculator
Decode resistor color bands to find resistance values. Supports 4-band, 5-band, and 6-band resistors with tolerance calculation.
Voltage Divider Calculator
Calculate output voltage for resistor voltage divider circuits. Essential for signal conditioning and reference voltage design.
Unit Converter
Convert between metric and imperial units. Millimeters to inches, Celsius to Fahrenheit, and more essential conversions for engineering.
Thread Size Chart & Calculator
Reference chart for metric and imperial thread sizes. Find tap drill sizes, clearance holes, and thread pitch for screws and bolts.
LED Resistor Calculator
Calculate the correct resistor value for LED circuits. Prevents LED damage and ensures optimal brightness based on supply voltage and LED specifications.
Battery Life Calculator
Calculate battery runtime based on capacity (mAh) and load current. Essential for portable electronics design and power management.
Why Use Our Engineering Calculators?
Our free engineering calculators are designed for professionals, students, and hobbyists who need accurate, reliable results for their electronics and mechanical design projects. Each calculator is built with precision and verified against industry-standard formulas.
Electrical Engineering Calculators
Our electrical engineering tools include the Ohm's Law Calculator for computing voltage, current, resistance, and power relationships. The Voltage Divider Calculator helps design voltage reference circuits and signal conditioning networks. These tools are essential for circuit design, troubleshooting, and educational purposes.
Electronics Component Tools
The Resistor Color Code Calculator decodes the colored bands on through-hole resistors to determine their resistance value and tolerance. Supporting 4-band, 5-band, and 6-band resistors, this tool eliminates guesswork and ensures accurate component identification.
Mechanical Engineering Tools
Our Thread Size Chart provides comprehensive reference data for metric and imperial thread sizes, including tap drill sizes and clearance hole dimensions. The Unit Converter handles conversions between metric and imperial measurements—essential for working with international specifications and datasheets.
Need Components for Your Project?
Browse our inventory of 500,000+ electronic components. From resistors to standoffs, we have the parts you need.