Resistor Color Code Decoder (3/4 Bands)
Resistor Color Code Decoder (3/4 Bands): Decodes significant digits (10), multiplies by decade multiplier (10^2 = 100), and assigns tolerance.
About this resistor color code decoder (3/4 bands)
Resistor Color Code Decoder (4/5/6 Bands) — browser-based utility.
How this tool works
Calculation and parameter relationship: resistanceOhms=(10×band1+band2)×10^multiplier
- Paste the sample input into “Input”.
- Click “Run locally”.
- Compare “Raw Output Data” with the example; revise inputs when an error is shown.
Worked example
Scenario: Decode a four-band resistor color sequence into ohms and tolerance.
Sample input:
Processing: Use brown=1 and black=0, apply red as 10², then map gold to ±5%.
Illustrative output:
Limits and verification
Parameter domains and units: bands ∈ {3,4}; multiplier(gold) = 10⁻¹; multiplier(silver) = 10⁻²; 3 bands ⇒ ±20%; 4 bands ⇒ {±1%,±2%,±0.5%,±0.25%,±0.1%,±0.05%,±5%,±10%}. Results use binary64 floating-point numbers unless BigInt is stated. Result cards show up to 10 significant digits; raw output retains the serialized value. A null ratio means the model has no meaningful finite value for that ratio; it is not zero.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- NIST Digital Library of Mathematical Functions, §1.2 — Elementary Algebra
- ECMAScript 2026, §6.1.6.1 Number Type
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Paste the sample input into “Input”.
- Click “Run locally”.
- Compare “Raw Output Data” with the example; revise inputs when an error is shown.
Frequently asked questions
How does the resistor color decoder derive resistance?+
It maps the first two color bands to digits, applies the third-band base-10 multiplier, and maps an optional fourth band to tolerance.
Which color input format does the page accept?+
Enter three or four lowercase color words separated by spaces or commas. The verified input is brown black red gold.
What validation and scope limits apply?+
The first two bands must be valid digit colors; the third must be a valid multiplier; a fourth band must be a valid tolerance color. It handles only three- or four-band textual codes, not measurement or component certification.
What result does the worked example produce?+
The tool processed brown black red gold locally and returned 1000 ohms with tolerance ±5%.