brown, black, red, gold
- Tolerance
- +/- 5%
- Minimum
- 950 ohms
- Maximum
- 1050 ohms
Resistor Calculator
Use this free resistor calculator to convert common 4-band resistor color codes into resistance, tolerance, minimum, and maximum values.
Research-backed assumptions Formula steps Examples included Private in-browser use
Formula steps
- Read the first two color bands as digits.
- Multiply by the multiplier color band.
- Read the tolerance band as the expected manufacturing range.
How to use the resistor calculator
- Choose the first digit, second digit, multiplier, and tolerance color bands.
- Press Decode resistor to see ohms and the tolerance range.
- Read bands in the correct direction before trusting the answer.
- Use a multimeter for real parts when circuit behavior matters.
Common uses
Decode a common 4-band resistor.
See the tolerance range around the nominal resistance.
Check a breadboard or electronics study example.
Compare resistor values before using Ohm law.
Examples
1,000 ohms +/- 5%
4,700 ohms +/- 5%
220 ohms +/- 5%
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Resistor Calculator?
Use it when your task matches one of these common needs: Decode a common 4-band resistor. See the tolerance range around the nominal resistance. It works best when you already know the values, dates, units, or settings the page asks for.
What is the Resistor Calculator doing with my inputs?
In plain language: The first two bands are digits, the third band is a multiplier, and the fourth band gives tolerance percentage. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
What should I double-check before trusting the answer?
Use a multimeter and circuit safety practices for real parts. Color bands can be faded, damaged, or read in the wrong direction. Also check that you used the right unit, date, scale, or mode because small input changes can change the result.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.
Related tools
Ohms Law Calculator Solve voltage, current, resistance, and power from two known circuit values. Open Voltage Drop Calculator Estimate voltage drop from current, wire length, voltage, phase, and copper AWG size. Open Electricity Calculator Estimate electricity use and cost from watts, hours, days, and rate per kWh. Open