Skip to main content
T

Resistor Calculator

NEW

Calculate resistor color codes or find the equivalent resistance for series and parallel circuits.

-- Ω
--
Limit Range --
E-Series Status --
Exact Multiplier Math
--
Send output to:
Advertisement

How to use Resistor Calculator

  1. Select the calculation tab: Color Code or Series/Parallel.
  2. For Color Code: Choose 4 or 5 bands, then select the color for each band to see the value update.
  3. For Series/Parallel: Input comma-separated resistor values (e.g. 100, 220, 470) and choose the connection type.

What is Resistor Calculator?

A resistor is a passive electrical component that creates resistance in the flow of electric current. This dual-purpose utility calculates:

  • Resistor Color Code: Determines the resistance value and tolerance based on selected color bands for 4-band and 5-band resistors.
  • Series and Parallel Resistance: Calculates the equivalent resistance (Req) of multiple resistors connected together.
Advertisement

FAQ

What is the E24 standard?
The E24 series is a set of standard preferred resistor values with a 5% tolerance, widely used in electronics design.
How are parallel resistors calculated?
Parallel equivalent resistance is calculated using the formula: 1/Req = 1/R1 + 1/R2 + ... + 1/Rn. The total parallel resistance is always smaller than the smallest individual resistor.

Related tools

People also use

← Back to Electricity Calculators · All tags

Last updated:

Advertisement