Resistor Color Code Calculator

Resistor Color Code Calculator turns resistor color bands into ohms in one tap. Pick the colors, see a live preview of your resistor, and get the resistance value and tolerance instantly – for 4 band, 5 band and 6 band resistors. The calculator works offline, so you can use it in the lab, the workshop or the classroom.

Built for electronics students, hobbyists and electrical engineers who want fast, reliable resistor values without memorizing the color chart.

⚡ RESISTOR CALCULATOR

• 4 band resistor color code: value and tolerance

• 5 band resistor color code: precision resistors with three digits

• 6 band resistor color code: value, tolerance and temperature coefficient (ppm/°C)

• Live resistor preview that updates as you choose each band color

• Results in Ω, kΩ and MΩ

• Works offline – no internet needed to calculate

📜 LEARN RESISTOR THEORY

Clear lessons on resistors: what a resistor does, Ohm's law, fixed and variable resistors, the resistor color code, power dissipation, resistor networks and arrays, temperature coefficient and how resistors are manufactured.

🔢 FORMULAS & STANDARD VALUES

• Resistor formulas for series, parallel, voltage divider and current divider circuits

• Standard resistor values table (E-series) for picking real parts

• Measurement guides for testing resistors

🧠 MCQs & DAILY QUIZ

Test your electronics knowledge with multiple choice questions across Basic, Intermediate and Advance levels. Great for exam preparation, viva and interviews. Solve the daily MCQ and collect resistors as rewards.

🛠️ PROJECT-BASED LEARNING

Apply what you learn with guided projects such as LED resistor design, voltage and current divider rules and a series testing board.

🕘 CALCULATION HISTORY

Every resistor value you calculate is saved, grouped by 4, 5 and 6 bands, so you can find it again for your next project. Sign in to keep your history on your account.

WHY STUDENTS AND ENGINEERS USE IT

• Fast: resistor color code to ohms in seconds

• Simple: clean, modern design that is easy to use

• Complete: calculator, theory, formulas, standard values, MCQs and projects in one app

• Offline calculator for labs with no signal

Whether you are reading resistor colour bands on a breadboard, checking a component before soldering, or studying for an electronics exam, Resistor Color Code Calculator gives you the value, tolerance and temperature coefficient you need – quickly and accurately.

Download Resistor Color Code Calculator and decode any resistor in seconds.