Resistance
1kΩ
Tolerance
±5%
Resistance Value
1kΩ
Min
950Ω
Max
1.1kΩ
As an Amazon Associate, we earn from qualifying purchases.
Inputs
Result
(1×10 + 0) × 100 = 1,000Ω. ±5% = 950–1,050Ω.
Inputs
Result
R = 5 / 0.02 = 250Ω. P = 5 × 0.02 = 0.1W. Use 270Ω (next E24 value) rated 1/4W.
A 4-band resistor: Band 1 = first digit, Band 2 = second digit, Band 3 = multiplier (number of zeros), Band 4 = tolerance. Brown-Black-Red-Gold = 10 × 100 = 1kΩ ±5%.
| Color | Digit | Multiplier | Tolerance |
|---|---|---|---|
| Brown | 1 | ×10 | ±1% |
| Red | 2 | ×100 | ±2% |
| Orange | 3 | ×1k | — |
| Yellow | 4 | ×10k | — |
| Green | 5 | ×100k | ±0.5% |
Ohm's Law: R = V / I. If you need 20mA through an LED with 5V supply and 2V LED forward voltage: R = (5-2) / 0.02 = 150Ω.
For most hobby projects, 5% (gold band) is fine. Precision circuits (audio, measurement) need 1% (brown band). 10% (silver) resistors are cheap but imprecise.
Too low resistance = too much current, can burn components. Too high resistance = insufficient current, circuit may not work. Always calculate before installing.
Electronics, outdoor, and everyday tools
Last Updated: Mar 26, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.