What resistor formats does this calculator support?

It supports 4-band, 5-band, and 6-band color-coded axial resistors, as well as 3-digit, 4-digit, and EIA-96 SMD resistors.

How do I decode an SMD resistor marked with '4R7'?

Select SMD format, enter '4R7' in the SMD Code field, and the tool will decode it to 4.7 Ohms.

What is the difference between 5-band and 6-band resistors?

A 6-band resistor includes an additional sixth band indicating the temperature coefficient in ppm/K.

Can I find the color bands for a specific resistance value?

Yes, switch the mode to 'Encode Resistance Value', enter your target resistance, and select the desired tolerance.

What does the EIA-96 code format mean?

EIA-96 is a standard marking system for 1% tolerance SMD resistors using a two-digit code followed by a multiplier letter.

Elysia Tools

Navigation

Math & Numbers

Resistor Color Code Calculator

Decode and encode 4-band, 5-band, 6-band, and SMD resistor markings

Details

What this tool helps you do

Switch between decode and encode modes. Decode reads color bands or SMD markings such as 472, 1001, 4R7, and 01C. Encode lets you enter a resistance value and get practical resistor markings back.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

3 examples

Decode a classic 4-band resistor

Read yellow violet red gold as a 4.7 kOhm resistor with 5% tolerance

{"result":{"formattedResistance":"4.7 kOhm","tolerance":"±5%"}}

Decode a 6-band precision resistor

Read brown black black red brown red as 10 kOhm ±1% with 50 ppm/K

{"result":{"formattedResistance":"10 kOhm","tolerance":"±1%","temperatureCoefficientLabel":"50 ppm/K"}}

Decode a common SMD marking

Interpret 472 as a 4.7 kOhm surface-mount resistor code

{"result":{"family":"3-digit","formattedResistance":"4.7 kOhm"}}

Inputs

Options are grouped so long tools stay easier to scan.

14 options

ContentPaste or type the main input values.2

SMD CodetextOptionalResistance ValuetextOptional

SettingsAdjust formats, ranges, numbers, and modes.12

ModeselectRequiredFormatselectRequiredSMD StyleselectOptionalBand 1selectOptionalBand 2selectOptionalBand 3selectOptionalMultiplier BandselectOptionalTolerance BandselectOptionalTempco BandselectOptionalToleranceselectOptionalTemperature CoefficientselectOptionalDecimal PrecisionnumberOptional

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

Resistor Color Code Calculator

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

Continue with connected tools and hubs

Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Decoding a 4-Band Resistor

2. Reading SMD Markings on a PCB

FAQ

Regex Replace Samples

PDF Samples

Test Pyramid Examples - Testing Strategy Guide

Changelog Extractor Samples

ASCII85 Converter

Atbash Cipher

Avro Converter

Base32 Converter

Electrical Circuit Calculation, Power, and Cable Sizing Tools

Markdown Export, OCR, and Document Conversion Tools

Markdown Writing and Publishing Tools

Documentation Authoring, Extraction, and Publishing Tools

3. Determining Color Bands for a Custom Circuit