Ω RESISTOR LAB Instructor by Eng. Mark Medhat

RESISTOR COLOR CODE CALCULATOR

Master resistor
color codes

Read resistor values instantly. Choose the bands, calculate the resistance, and understand exactly how the answer was calculated.

Start Reading → Practice Now

SAMPLE READING

BrownRedOrangeGold
12 kΩ
±5% tolerance

WHAT YOU CAN DO

Everything a resistor color code needs, in one lab

Decode any resistor
4, 5, and 6-band readings with tolerance and temperature coefficient.
Go in reverse
Type a resistance and get the exact color bands back.
Practice for real
Timed, scored quizzes across three difficulty levels.

CALCULATOR

Resistor Calculator

Pick the band count, then choose each color. The resistor and the result update live.

RESISTANCE

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Tolerance
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How did we get this?
Every band, in order.

REVERSE CALCULATOR

Resistance → Color Code

Enter a value and tolerance, and get the resistor bands back.

CLOSEST STANDARD READING

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REFERENCE

Color Code Reference

Every value, in one table.

Color Digit Multiplier Tolerance Temp. Coefficient

LEARN

Resistor Color Code Theory

Eight short lessons — open the ones you need.

RESISTOR PRACTICE

Choose a difficulty

Ten questions per round. One clear answer each time.

ABOUT

About Resistor Lab

Resistor Lab is an interactive educational tool designed to help engineering students understand resistor color codes, calculate resistance values, and practice reading real-world resistor configurations.

Instructor

Eng. Mark Medhat

Focus
  • Electronics
  • Electrical Engineering
  • Engineering Education