Resistor Calculator - Calculator See


Resistor Calculator

Decode 4-band and 5-band resistor color codes to calculate nominal resistance, tolerance percentage, and resistance range in Ohms.

Calculator Inputs

First color ring.
Second color ring.
Decimal multiplier.
Manufacturing tolerance.

Calculated Results

Resistance Value
10 kΩ ± 5%
Minimum Resistance 9.50 kΩ (9,500 Ω)
Maximum Resistance 10.50 kΩ (10,500 Ω)
Band Sequence Brown - Black - Orange - Gold
Values calculate live as you adjust inputs.

About Resistor Calculator

Translates standardized EIA colored bands printed on axial through-hole resistors into ohmic resistance and tolerance values.

What is Resistor Calculator?

Translates standardized EIA colored bands printed on axial through-hole resistors into ohmic resistance and tolerance values.

How to Use This Calculator

  1. Select colors for Band 1, Band 2, Multiplier, and Tolerance.
  2. Read resistance in Ohms, kΩ, or MΩ.

The Mathematical Formula & Variables

Resistance = (Digit1 * 10 + Digit2) * Multiplier +/- Tolerance%

Step-by-Step Worked Example

Scenario: Brown - Black - Orange - Gold resistor.

  1. Brown = 1, Black = 0 -> base digits = 10.
  2. Orange multiplier = 1,000.
  3. 10 * 1,000 = 10,000 Ohms (10 kΩ).
  4. Gold tolerance = ±5% (range: 9.5 kΩ to 10.5 kΩ).

Result: 10 kΩ ± 5%

Frequently Asked Questions

How do you know which end of a resistor to read first?

The tolerance band (often Gold or Silver) is separated from the other bands by a noticeably wider gap and should be placed on the right.