Resistor Calculator Suite
Decode 4, 5, and 6-band color codes with live visual resistors, calculate series and parallel combinations, and reference international standard E-series tables in one unified tool.
Color Code Calculator
Select the colored bands to calculate resistance value, tolerance, and temperature coefficient.
Inverse Color Code Calculator
Enter an ohmic value to get the matching color code bands for standard resistors.
Series & Parallel Circuit Calculator
Add resistor stages and instantly compute the total equivalent resistance for series or parallel networks.
Standard Resistor Values
Explore standard commercial resistor decade series defined by IEC 60063 (E12, E24, and E96).
| Base | ×1 Ω | ×10 Ω | ×100 Ω | ×1 kΩ | ×10 kΩ | ×100 kΩ | ×1 MΩ |
|---|
How ResistCalc Works
Master resistor color bands, series-parallel circuit equations, and standard tolerance series with our step-by-step engineering principles.
Identify Band Count
Count the total color bands on your axial resistor: 4 bands for standard commercial components, 5 bands for high-precision 1% resistors, or 6 bands when thermal drift (TCR) is specified.
Orient Left-to-Right
Place the tolerance band (typically Gold, Silver, or visually separated by a wider gap) on the right side. Read the significant digit bands starting from the leftmost band.
Multiply & Apply Tolerance
Multiply the base significant digits by the power-of-ten multiplier. Verify that the resulting value falls within a standard commercial decade series (E12, E24, or E96).
Resistor Color Code Reference Chart
International IEC 60062 color coding standard for significant digits, multipliers, tolerance ratings, and temperature coefficients.
| Color | Significant Digit | Multiplier | Tolerance | Temp. Coefficient |
|---|---|---|---|---|
| Black | 0 | ×1 Ω | — | — |
| Brown | 1 | ×10 Ω | ± 1% (F) | 100 ppm/°C |
| Red | 2 | ×100 Ω | ± 2% (G) | 50 ppm/°C |
| Orange | 3 | ×1 kΩ | — | 15 ppm/°C |
| Yellow | 4 | ×10 kΩ | — | 25 ppm/°C |
| Green | 5 | ×100 kΩ | ± 0.5% (D) | 20 ppm/°C |
| Blue | 6 | ×1 MΩ | ± 0.25% (C) | 10 ppm/°C |
| Violet | 7 | ×10 MΩ | ± 0.1% (B) | 5 ppm/°C |
| Gray | 8 | ×100 MΩ | ± 0.05% (A) | 1 ppm/°C |
| White | 9 | ×1 GΩ | — | — |
| Gold | — | ×0.1 Ω | ± 5% (J) | — |
| Silver | — | ×0.01 Ω | ± 10% (K) | — |
Frequently Asked Questions
Everything you need to know about reading resistors, standard series, and circuit calculations.
How do I read a 4-band resistor color code?
A 4-band resistor has two significant digit bands, one multiplier band, and one tolerance band separated by a wider space. For example, Red (2), Violet (7), Orange (×1kΩ), Gold (±5%) equals 27 kΩ ± 5%.
What is the difference between 4-band, 5-band, and 6-band resistors?
4-band resistors use 2 significant digits with standard tolerances (typically 5% or 10%). 5-band resistors add a 3rd significant digit for high-precision resistors (1% or 0.5%). 6-band resistors include a 6th band indicating the temperature coefficient of resistance (TCR in ppm/°C).
How do you calculate series versus parallel resistance?
For resistors in series, simply sum their values: Rtotal = R1 + R2 + ... + Rn. For resistors in parallel, the reciprocal of the total resistance equals the sum of the reciprocals: 1/Rtotal = 1/R1 + 1/R2 + ... + 1/Rn.
What are E12, E24, and E96 standard resistor series?
Defined by international standard IEC 60063, E-series specify standard preferred values per decade. E12 offers 12 values per decade (±10% tolerance), E24 offers 24 values (±5%), and E96 offers 96 precision values (±1%).
Which way do I hold a resistor to read the bands correctly?
Hold the resistor so the tolerance band (often gold, silver, or positioned further away from the other bands) is on the right side. Read the remaining colored bands starting from left to right.