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Electrical

Resistor Tolerance Calculator

Find the minimum and maximum resistance permitted by a nominal tolerance.

Ideal component relationshipsUnits and assumptions explained below
Circuit workbench
Circuit workbench

Keep RMS, peak and DC values distinct.

See the method

Enter circuit values

Runs on your device

Your circuit result

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter nominal resistance, tolerance.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Resistance interval = nominal × (1 ± tolerance/100).

A WORKED EXAMPLE

Using nominal resistance = 1000 Ω, tolerance = 5 %, the result is 50 Ω. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Main result is the plus-or-minus allowance. Temperature drift and aging are separate from the stated initial tolerance.

What to keep in mind

Main result is the plus-or-minus allowance. Temperature drift and aging are separate from the stated initial tolerance. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Common questions

How do I use this resistor tolerance calculator?

Find the minimum and maximum resistance permitted by a nominal tolerance. Enter nominal resistance in Ω, tolerance in %. The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

Main result is the plus-or-minus allowance. Temperature drift and aging are separate from the stated initial tolerance.

Methodology maintained by ClarityKit. How these tools are built and checked.