LEDsAvailable
LED Resistor Calculator
Calculate current-limiting resistor value and recommended power rating.
Calculator category
LED Calculators
LED calculators support practical lighting and indicator design by helping engineers calculate current-limiting values, power dissipation, operating current, and component margins. These tools are useful for embedded hardware, front-panel indicators, LED strip design, and high-power lighting circuits where thermal and current limits must be checked.
Available Calculators
12
Engineering Applications
4
Calculators
Each listed tool links to a working calculator with engineering inputs, formulas, examples, notes, and related resources.
LEDsAvailable
LED Current Calculator
Calculate LED operating current, resistor voltage drop, resistor power, LED power, and total circuit power.
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LED Power Calculator
Calculate LED power, supply power, resistor loss, and total circuit power for single LEDs, series strings, and LED arrays.
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LED Series Array Calculator
Calculate maximum LEDs in series, required resistor value, LED string current, voltage headroom, power, and efficiency.
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LED Parallel Array Calculator
Calculate branch current, resistor values, LED count, total power, and supply requirements for parallel LED arrays.
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LED Strip Power Calculator
Calculate LED strip power, supply current, voltage drop, power injection, controller sizing, and battery runtime.
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High Power LED Thermal Calculator
Calculate high-power LED junction temperature, heat dissipation, heatsink thermal resistance, thermal margin, and safe current.
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LED Driver Efficiency Calculator
Calculate LED driver efficiency, input power, output power, power loss, thermal rise, supply requirements, and annual energy use.
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LED PWM Dimming Calculator
Calculate LED PWM duty cycle, average current, on-time, timer register values, gamma correction, resolution, switching loss, and dimming frequency.
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RGB LED Resistor Calculator
Calculate separate resistor values, current, and power for red, green, and blue RGB LED channels.
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LED Lumen, Candela & Lux Calculator
Convert lumens, candela, and lux, and estimate luminous efficacy, beam angle, LED quantity, and lighting performance.
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LED CCT & Chromaticity Calculator
Convert LED CIE xy, uv, and u′v′ coordinates, estimate CCT and Duv, and compare white LED chromaticity points.
How to Use These Calculators
Start From the Engineering Question
Choose the calculator that matches the decision you need to make: decode a component marking, size a value, check a frequency response, estimate loss, or verify a safety margin. A category page is useful only when it helps you reach a working tool, so this page lists released calculators only.
Check Units and Assumptions
Calculator results depend on unit choices, idealized formulas, tolerance, temperature, frequency range, and component limitations. Review the formula and engineering notes on each calculator page before using the result in a schematic, BOM, or PCB layout.
Validate Against Real Parts
Use the calculated value as a design reference, then confirm it against datasheets, derating curves, layout parasitics, measurement conditions, and manufacturer limits. The related guides below provide background when a calculation needs more context.
Engineering Applications
LED Indicators
LED Strip Design
High Power LEDs
RGB Lighting
Related Engineering Guides
Engineering Guide
Understanding LEDs
Learn how LEDs work and understand key LED characteristics including forward voltage, forward current, wavelength, color, luminous intensity, efficiency, LED types, packages, and applications.
14 min · Beginner
Engineering Guide
How to Choose the Right LED
Learn how to choose the right LED by application, forward voltage, current, brightness, wavelength, color temperature, viewing angle, package, power, thermal behavior, and datasheet limits.
15 min · Intermediate
Engineering Blog
10 Common PCB Power & Trace Design Mistakes (and How to Avoid Them)
Avoid common PCB power and trace design mistakes including undersized traces, voltage drop, via bottlenecks, RMS-current errors, thermal issues, poor copper pours, and high-current layout problems.
24 min · Intermediate
Engineering Blog
10 Common Power Design Mistakes (and How to Avoid Them)
Avoid common power design mistakes involving watts versus watt-hours, unit prefixes, RMS current, power factor, efficiency, derating, thermal design, startup current, voltage drop, and undersized components.
17 min · Intermediate
Engineering Blog
10 Common LED Design Mistakes (and How to Avoid Them)
Avoid common LED design mistakes including missing current control, incorrect resistor values, excessive current, forward-voltage assumptions, resistor power errors, thermal problems, brightness comparison errors, and improper LED driving.
14 min · Intermediate
Related categories
Resistors
Resistor calculators for circuit design, component selection, power dissipation, and hardware troubleshooting.
Open →Diodes
Diode calculators for rectification, zener regulation, voltage drops, protection circuits, and power loss.
Open →Power
Power electronics calculators for regulators, converters, thermal design, current estimates, and hardware margins.
Open →