5 Band Resistor Calculator Form
Choose three digit bands, one multiplier band, and one tolerance band. Add an optional voltage to estimate current and power.
Live preview of the selected resistor bands.
Example Data Table
| Band 1 | Band 2 | Band 3 | Multiplier | Tolerance | Calculated Value |
|---|---|---|---|---|---|
| Brown | Black | Black | Red | Brown | 10 kΩ ±1% |
| Red | Violet | Black | Brown | Gold | 2.7 kΩ ±5% |
| Yellow | Violet | Black | Gold | Red | 47 Ω ±2% |
| Green | Blue | Black | Orange | Brown | 560 kΩ ±1% |
| Gray | Red | Black | Yellow | Green | 8.2 MΩ ±0.5% |
Formula Used
A five band resistor uses the first three color bands as significant digits, the fourth band as the multiplier, and the fifth band as tolerance.
Resistance Formula:
R = (100 × Band1 + 10 × Band2 + Band3) × Multiplier
Tolerance Range:
Minimum Resistance = R × (1 − Tolerance / 100)
Maximum Resistance = R × (1 + Tolerance / 100)
Optional Electrical Estimates:
Current = Voltage ÷ Resistance
Power = Voltage² ÷ Resistance
How to Use This Calculator
- Select the first color band for the first digit.
- Select the second color band for the second digit.
- Select the third color band for the third digit.
- Select the multiplier band to scale the three digit number.
- Select the tolerance band to calculate the minimum and maximum range.
- Optionally enter an applied voltage to estimate current and power.
- Click the calculate button to display the result above the form.
- Use the export buttons to download CSV or PDF summaries.
FAQs
1. What does a five band resistor mean?
A five band resistor uses three color bands for digits, one for the multiplier, and one for tolerance. It provides finer resistance precision than common four band resistors.
2. Why are there three digit bands first?
The first three bands create a three digit number, such as 100 or 562. This gives more exact nominal values before the multiplier is applied.
3. What does the multiplier band do?
The multiplier tells you how much to scale the three digit number. For example, red means multiply by 100, while gold means multiply by 0.1.
4. What does tolerance represent?
Tolerance shows how far the actual resistance may vary from the nominal rating. A 1 kΩ resistor with ±5% tolerance can vary between 950 Ω and 1050 Ω.
5. Can this tool estimate current and power too?
Yes. When you enter an applied voltage, the calculator estimates current using Ohm’s law and estimates power using voltage squared divided by resistance.
6. Is the resistor preview only decorative?
No. It also helps confirm your selected band order visually. This reduces reading mistakes when matching the calculator to a real component.
7. Why do minimum and maximum values matter?
Circuits often need resistance within a safe range. Minimum and maximum values help you judge whether a component stays acceptable under tolerance variation.
8. When should I use a five band calculator?
Use it when reading precision resistors, troubleshooting electronics, verifying component bins, or checking circuit parts where exact resistor values and tolerances matter.