--- title: "LED Resistor Calculator | LED Circuit Resistor Tool | XTRAW Tools" description: "Calculate the resistor needed for an LED circuit from supply voltage, LED voltage, and current with a free calculator." url: "https://xtraw.com/tools/industry-tools/education-tools/led-resistor-calculator" date: "2026-07-06T06:01:20+00:00" language: "en-GB" --- [Z Score Calculator](https://xtraw.com/tools/industry-tools/education-tools/z-score-calculator)[Actual Yield Calculator](https://xtraw.com/tools/industry-tools/education-tools/actual-yield-calculator) [![LED Resistor Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/xtraw-led-resistor-calculator-360x360.jpg)](https://xtraw.com/images/virtuemart/product/xtraw-led-resistor-calculator-360x360.jpg "LED Resistor Calculator from XTRAW Tools") new [Back to: Education Tools](https://xtraw.com/tools/industry-tools/education-tools "Education Tools") # LED Resistor Calculator Calculate the resistor needed for an LED circuit. Use this free browser-based led resistor calculator from XTRAW Tools. **LED Resistor Calculator** helps you calculate the resistor needed for an LED circuit. Use this free browser-based calculator from XTRAW Tools to compare inputs, estimate results, and plan your next step. ## How to Use the LED Resistor Calculator 1. Enter the required calculator inputs shown in the form. 2. Review the measurements, electrical values, grades, weights, rates, or reading assumptions. 3. Run the calculator, then adjust one input at a time to compare scenarios or check your work. ## What This Calculator Helps With Calculate the resistor needed for an LED circuit. It is designed for electronics hobbyists, students, makers, engineers, and anyone planning LED circuits who want a fast, browser-based estimate before relying on a contractor, electrician, engineer, code authority, teacher, advisor, or professional source. - Supply Voltage: 12 V - LED Forward Voltage: 2 V - LED Current: 20 mA ## Common Uses People use this calculator when they need a quick way to estimate construction materials, electrical values, solar sizing, school grades, GPA, or reading time from real inputs. - **Math Solving:** Apply formulas to solve grade, physics, electrical, or school-related calculations. - **Measurement:** Use measurements, grades, electrical values, or reading values to get a clear result. - **Project Planning:** Compare project assumptions, academic goals, energy plans, or electrical scenarios. ## Formula or Method R = (Vsupply - Vled) / Iled. ## Example **Example inputs:** Supply Voltage: 12 V; LED Forward Voltage: 2 V; LED Current: 20 mA **Example result:** Using the default inputs, the recommended resistor is about 500 Ω. ## Related Tools - [Ohm's Law Calculator](https://xtraw.com/tools/ohms-law-calculator) - [Capacitor Calculator](https://xtraw.com/tools/capacitor-calculator) - [Watts To Amps Calculator](https://xtraw.com/tools/watts-to-amps-calculator) - [Voltage Drop Calculator](https://xtraw.com/tools/voltage-drop-calculator) - [Wire Size Calculator](https://xtraw.com/tools/wire-size-calculator) - [Binary Calculator](https://xtraw.com/tools/binary-calculator) ## LED Resistor Calculator FAQ ### Is the LED Resistor Calculator free? Yes. This calculator is free to use on XTRAW Tools. ### Do I need to create an account? No. XTRAW tools are designed for browser-based use without requiring an account. ### Are the results exact? Results may be estimates depending on the inputs, formula, rounding, assumptions, and purpose of the calculator. Always verify important results before relying on them. **Disclaimer:** This calculator is provided for general informational, educational, and convenience purposes only. It is not legal, financial, medical, tax, engineering, electrical, construction, solar, academic, safety, or professional advice. Always verify important results with a qualified professional, instructor, code authority, manufacturer documentation, or authoritative source before making decisions. **Related Tools** ![Tooltip]() [![Ohm's Law Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-ohms-law-calculator-360x360_230x230.jpg) Ohm's Law Calculator](https://xtraw.com/tools/industry-tools/education-tools/ohms-law-calculator "Ohm's Law Calculator") Calculate voltage, current, resistance, or power using Ohm's law. Use this free browser-based ohm's law calculator from XTRAW Tools. Custom prototype for related products [![Capacitor Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-capacitor-calculator-360x360_230x230.jpg) Capacitor Calculator](https://xtraw.com/tools/industry-tools/education-tools/capacitor-calculator "Capacitor Calculator") Calculate capacitor charge, energy, and RC time constant. Use this free browser-based capacitor calculator from XTRAW Tools. Custom prototype for related products [![Watts to Amps Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-watts-to-amps-calculator-360x360_230x230.jpg) Watts to Amps Calculator](https://xtraw.com/tools/calculators/science-calculators/watts-to-amps-calculator "Watts to Amps Calculator") Convert watts to amps and estimate current from voltage and power factor. Use this free browser-based watts to amps calculator from XTRAW Tools. Custom prototype for related products [![Voltage Drop Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-voltage-drop-calculator-360x360_230x230.jpg) Voltage Drop Calculator](https://xtraw.com/tools/calculators/science-calculators/voltage-drop-calculator "Voltage Drop Calculator") Calculate voltage drop in electrical wiring. Use this free browser-based voltage drop calculator from XTRAW Tools. 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