Resistor Tolerance Calculator


Calculating resistor values with precision is essential in electronic circuit design. To simplify this process, a resistor tolerance calculator proves invaluable. This article will guide you through its usage, formula, examples, FAQs, and conclusion.

How to Use

Using the resistor tolerance calculator is straightforward. Simply input the resistance value (in ohms) and the tolerance percentage, then click the “Calculate” button. The calculator will provide the minimum and maximum resistance values based on the given tolerance.


The formula used in the resistor tolerance calculator is as follows:

Minimum Resistance=Resistance−(Tolerance100×Resistance)

Maximum Resistance=Resistance+(Tolerance100×Resistance)


  • ResistanceResistance is the nominal resistance value in ohms.
  • ToleranceTolerance is the tolerance percentage.

Example Solve

Suppose you have a resistor with a nominal resistance of 1000 ohms and a tolerance of 5%. Plugging these values into the calculator:

  • Resistance: 1000 ohms
  • Tolerance: 5%

After clicking “Calculate,” the results will be:

  • Minimum Resistance: 950 ohms
  • Maximum Resistance: 1050 ohms


What is resistor tolerance?

Resistor tolerance refers to the allowable deviation from the nominal resistance value specified by the manufacturer. It is typically expressed as a percentage.

Why is resistor tolerance important?

Resistor tolerance ensures that manufactured resistors meet certain standards of accuracy. Understanding tolerance helps in selecting the right components for precise circuit design.

Can I use this calculator for variable resistors?

No, this calculator is designed for fixed resistors with specified tolerance percentages. Variable resistors, such as potentiometers, have adjustable resistance values and do not have tolerance percentages.


The resistor tolerance calculator simplifies the process of determining the minimum and maximum resistance values based on nominal resistance and tolerance percentage. By utilizing this tool, engineers and hobbyists can ensure accurate component selection in electronic circuit design.

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