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 LED Resistor Calculator

Single led - Leds in series - Leds in parallel

Single led:
Single Led Resistance Resistor Circuit Schematic Calculator
Maximum Supply Voltage (Vmax)This is the maximum voltage which the led circuit and resistor will ever be exposed to. Note that most 12 volt systems are nominally 12 volts, but in practice often are actually 13 volts, 14 volts or even 14.5+ volts. This oversight is the primary cause of premature led failure. If the actual voltage applied to your circuit exceeds this number, the led and/or resistor would fail prematurely, or possibly instantly. To be safe, be sure to use the maximum expected voltage. VOLTS
Forward Voltage (Vf)This is the maximum voltage which the led can safely operate at if there was no resistance. "Forward" refers to the voltage being applied to the circuit forward of the resistor, rather than thru the resistor. This is usally a low voltage, like 1.8-4.0 volts. If a higher voltage is applied directly to the led without passing thru a resistor, the led would fail prematurely, or possibly instantly. VOLTS
Maximum LED Current (lmax)This is the maximum current which the led is rated to be able to be driven at. With higher powered leds, you must also assure that you have suficent cooling to allow the led to survive at peak rated current. If the maximum rated current, or maximum safe operating temperature (junction temperature) of the led is exceeded, the led would fail prematurely, or possibly instantly. MILLIAMPS



Resistor Value (R)This is the resistor value which will set the current thru the circuit exactly at the value of the Maximum Led Current value (Imax) when the Maximum Supply Voltage (Vmax) is applied to the circuit.
OHMS
Nearest Higher Resistor (10%, E12) AvailableThis is the resistor value which is the next higher of the commmon E12 (10%) resistors available. These resistors come in the following sizes: (100,120,150,180,220,270,330,390,470,560,680,820 ohm). By choosing the next higher value resistor the result will be a dimmer led, but less likelihood of premature failure. Choosing the next lower value resistor will result in a brigher led, but higher risk of premature failure. OHMS
Minimum Resistor Wattage (Wmin)This is the minimum acceptable wattage rating for the resistor to be used. Using a resistor with a higher wattage rating is always better, and will result in both the resistor and led staying cooler and lasting longer. The downside of choosing a resistor which is rated too high in wattage is that resistors which are rated at higher wattages are also larger in size. Choosing a resistor that is close to, or below the Minimum Resistor Wattage value will result in the resistor failing and could also cause a fire, or burn up the circuity and led. WATTS (Or Greater) Recommended Resistor Wattage (Wrec)This is a recommended wattage rating for the resistor to be used. Using a resistor with a higher wattage rating is always better, and will result in both the resistor and led staying cooler and lasting longer. The downside of choosing a resistor which is rated too high in wattage is that resistors which are rated at higher wattages are also larger in size. Choosing a resistor that is close to, or below the Minimum Resistor Wattage value will result in the resistor failing and could also cause a fire, or burn up the circuity and led. WATTS (Or Greater)
Leds in series:
Series Led Resistance Resistor Circuit Schematic Calculator
Maximum Supply Voltage (Vmax)This is the maximum voltage which the led circuit and resistor will ever be exposed to. Note that most 12 volt systems are nominally 12 volts, but in practice often are actually 13 volts, 14 volts or even 14.5+ volts. This oversight is the primary cause of premature led failure. If the actual voltage applied to your circuit exceeds this number, the led and/or resistor would fail prematurely, or possibly instantly. To be safe, be sure to use the maximum expected voltage. VOLTS
Forward Voltage (Vf)This is the maximum voltage which each of the the leds alone can safely operate at if there was no resistance. "Forward" refers to the voltage being applied to the circuit forward of the resistor, rather than thru the resistor. When you have more than one led, you must use the lowest value of the led with the lowest value so that it will not be overloaded, or if the Forward Voltage of each of leds on the same circuit are mot matched closely, then they should be on seperate circuits with their own resistor. This value is usally a low voltage, like 1.8-4.0 volts. If a higher voltage is applied directly to the led without passing thru a resistor, the led would fail prematurely, or possibly instantly. If one or more of the leds connected has a lower Forward Voltage than is used in the calculation, then that led will be vulnerable to premature failure. VOLTS
Maximum LED Current (lmax)This is the maximum current which the led is rated to be able to be driven at. With higher powered leds, you must also assure that you have suficent cooling to allow the led to survive at peak rated current. If the maximum rated current, or maximum safe operating temperature (junction temperature) of any of the leds in the circuit is exceeded, the led would fail prematurely, or possibly instantly. MILLIAMPS
Number Of Leds ConnectedEnter the total number of leds to be connected to this resistor.



Resistor Value (R)This is the resistor value which will set the current thru the circuit exactly at the value of the Maximum Led Current value (Imax) when the Maximum Supply Voltage (Vmax) is applied to the circuit. OHMS
Nearest Higher Resistor (10%, E12) AvailableThis is the resistor value which is the next higher of the commmon E12 (10%) resistors available. These resistors come in the following sizes: (100,120,150,180,220,270,330,390,470,560,680,820 ohm). By choosing the next higher value resistor the result will be a dimmer led, but less likelihood of premature failure. Choosing the next lower value resistor will result in a brigher led, but higher risk of premature failure. OHMS
Minimum Resistor Wattage (Wmin)This is the minimum acceptable wattage rating for the resistor to be used. Using a resistor with a higher wattage rating is always better, and will result in both the resistor and led staying cooler and lasting longer. The downside of choosing a resistor which is rated too high in wattage is that resistors which are rated at higher wattages are also larger in size. Choosing a resistor that is close to, or below the Minimum Resistor Wattage value will result in the resistor failing and could also cause a fire, or burn up the circuity and led. WATTS (Or Greater)
Recommended Resistor Wattage (Wrec)This is a recommended wattage rating for the resistor to be used. Using a resistor with a higher wattage rating is always better, and will result in both the resistor and led staying cooler and lasting longer. The downside of choosing a resistor which is rated too high in wattage is that resistors which are rated at higher wattages are also larger in size. Choosing a resistor that is close to, or below the Minimum Resistor Wattage value will result in the resistor failing and could also cause a fire, or burn up the circuity and led.
WATTS (Or Greater)
Leds in parallel:
Parallel Led Resistance Resistor Circuit Schematic Calculator
Maximum Supply Voltage (Vmax)This is the maximum voltage which the led circuit and resistor will ever be exposed to. Note that most 12 volt systems are nominally 12 volts, but in practice often are actually 13 volts, 14 volts or even 14.5+ volts. This oversight is the primary cause of premature led failure. If the actual voltage applied to your circuit exceeds this number, the led and/or resistor would fail prematurely, or possibly instantly. To be safe, be sure to use the maximum expected voltage. VOLTS
Forward Voltage (Vf)This is the maximum voltage which each of the the leds alone can safely operate at if there was no resistance. "Forward" refers to the voltage being applied to the circuit forward of the resistor, rather than thru the resistor. When you have more than one led ands you connect in parralel, it is essential that the Forward Voltage of each led in the circuit be identical, or the led with the lower Forward Voltage will be overloaded, or if the Forward Voltage of each of leds on the same circuit are not midentical, then they should be on seperate circuits with their own resistor. This value is usally a low voltage, like 1.8-4.0 volts. If a higher voltage is applied directly to the led without passing thru a resistor, the led would fail prematurely, or possibly instantly. If one or more of the leds connected has a lower Forward Voltage than is used in the calculation, then that led will be vulnerable to premature failure. VOLTS
Maximum LED Current (lmax)This is the maximum current which the led is rated to be able to be driven at. With higher powered leds, you must also assure that you have suficent cooling to allow the led to survive at peak rated current. If the maximum rated current, or maximum safe operating temperature (junction temperature) of any of the leds in the circuit is exceeded, the led would fail prematurely, or possibly instantly.
MILLIAMPS
Number Of Leds ConnectedEnter the number of leds you are connecting to the circuit.



Resistor Value (R)This is the resistor value which will set the current thru the circuit exactly at the value of the Maximum Led Current value (Imax) when the Maximum Supply Voltage (Vmax) is applied to the circuit. OHMS
Nearest Higher Resistor (10%, E12) AvailableThis is the resistor value which is the next higher of the commmon E12 (10%) resistors available. These resistors come in the following sizes: (100,120,150,180,220,270,330,390,470,560,680,820 ohm). By choosing the next higher value resistor the result will be a dimmer led, but less likelihood of premature failure. Choosing the next lower value resistor will result in a brigher led, but higher risk of premature failure. OHMS
Minimum Resistor Wattage (Wmin)This is the minimum acceptable wattage rating for the resistor to be used. Using a resistor with a higher wattage rating is always better, and will result in both the resistor and led staying cooler and lasting longer. The downside of choosing a resistor which is rated too high in wattage is that resistors which are rated at higher wattages are also larger in size. Choosing a resistor that is close to, or below the Minimum Resistor Wattage value will result in the resistor failing and could also cause a fire, or burn up the circuity and led. WATTS (Or Greater)
Recommended Resistor Wattage (Wrec)This is a recommended wattage rating for the resistor to be used. Using a resistor with a higher wattage rating is always better, and will result in both the resistor and led staying cooler and lasting longer. The downside of choosing a resistor which is rated too high in wattage is that resistors which are rated at higher wattages are also larger in size. Choosing a resistor that is close to, or below the Minimum Resistor Wattage value will result in the resistor failing and could also cause a fire, or burn up the circuity and led.
WATTS (Or Greater)

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These Bulbs are Commonly Used in: Acura CL Integra Legend MDX NSX RL RSX SLX TL TSX Vigor Alfa Romeo Spider AMC Aston Martin Audi A3 A4 A6 A8 Allroad Cabriolet Q7 RS4 RS6 S4 S6 S8 TT Austin Austin Healey Bentley BMW 2002 3 Series 5 Series 6 Series 7 Series 8 Series M3 M5 M6 M Roadster & Coupe X3 X5 Z3 Z4 Z8 Buick Century Electra Grand National Lacrosse LeSabre Lucerne Park Avenue Rainier Reatta Regal Rendezvous Riviera Roadmaster Skylark Cadillac Allante Catera CTS DeVille Eldorado Escalade Fleetwood Seville SRX STS XLR Chevrolet Astro Avalanche Aveo Bel Air/150/210 Blazer C/K Pickup 1500 C/K Pickup 2500 C/K Pickup 3500 C-10 Camaro Caprice Cavalier Chevelle Cheyenne Cobalt Colorado Corsica Corvair Corvette El Camino Equinox Express G20 Van HHR Impala Lumina Malibu Monte Carlo Nova S-10 Silverado 1500 Silverado 2500 Silverado 3500 SSR Suburban Tahoe Tracker Trailblazer Uplander Venture Pickups Chrysler 300 Series Aspen Cirrus Concorde Crossfire Imperial LeBaron LHS New Yorker Newport Pacifica Prowler PT Cruiser Royal Sebring Town & Country Citroen Cord Daewoo Datsun Z-Series DeLorean DeSoto Dodge Avenger Caliber Caravan Challenger Charger Coronet Dakota Dart Durango Grand Caravan Intrepid Lancer Magnum Neon Nitro Power Wagon Ram 1500 Ram 2500 Ram 3500 Ram Van Shadow Sprinter Stealth Stratus Viper Pickups Eagle Edsel Ferrari 360 Fiat Ford Aerostar Aspire Bronco Bronco II Contour Crown Victoria Edge Escape Escort E-Series Van Excursion Expedition Explorer Explorer Sport Explorer Sport Trac F-100 F-150 F-250 F-350 Fairlane Fairmont Falcon Five Hundred Focus Ford GT Freestar FreeStyle Fusion Galaxie Model A Model T Mustang Probe Ranchero Ranger Taurus Tempo Thunderbird Torino Windstar Geo GMC Envoy Jimmy Safari Savana Sierra 1500 Sierra 2500 Sierra 3500 Sonoma Suburban Typhoon Yukon Honda Accord Civic CR-V CRX Del Sol Element Fit Insight Odyssey Passport Pilot Prelude Ridgeline S2000 Hummer H1 H2 H3 Hyundai Accent Azera Elantra Santa Fe Sonata Tiburon Tucson Infiniti FX G20 G35 I30 I35 J30 M Q45 QX4 QX56 International Harvester Scout Isuzu Amigo Rodeo Trooper VehiCROSS Jaguar E-Type S-Type XJ6 XJ8 XJR XJS XK8 X-Type Jeep Cherokee CJ Commander Commando Grand Cherokee Liberty Renegade Wagoneer Wrangler Kia Rio Sedona Sephia Sorento Spectra Sportage Lamborghini Lancia Land Rover Defender Discovery Freelander LR3 Range Rover Lexus ES GS GX IS LS LX RX SC Lincoln Aviator Continental LS Mark Series Navigator Town Car Zephyr & MKZ Lotus Elise Esprit Maserati Mazda 323 626 929 B-Series Pickups CX-7 Mazda3 Mazda5 Mazda6 Millenia MPV MX-3 MX-5 Miata MX-6 Protégé RX-7 RX-8 Tribute Mercedes Benz 190 Series 200 Series 300 Series 400 Series 500 Series 600 Series C Class CL Class CLK Class CLS Class E Class G Class M Class R Class S Class SL Class SLK Class SLR McLaren Mercury Capri Comet Cougar Grand Marquis Mariner Milan Montego Monterey Mountaineer Mystique Sable Tracer Villager MG MGA MGB Midget T-Series Mini Classic Mini Mini Cooper Mini Cooper S Mitsubishi 3000GT Diamante Eclipse Galant Lancer Mirage Montero Nash Nissan 200SX 240SX 280ZX 300ZX 350Z Altima Armada Frontier Maxima Murano Pathfinder Quest Sentra Stanza Titan Versa Xterra Oldsmobile 442 Alero Aurora Bravada Cutlass Eighty-Eight Intrigue Ninety-Eight 98 Silhouette Toronado Opel Packard Peugeot Plymouth Acclaim Barracuda Duster Fury Grand Voyager GTX Neon Prowler Road Runner Satellite Sundance Voyager Pontiac Bonneville Catalina Fiero Firebird G6 Grand Am Grand Prix GTO Le Mans Montana Solstice Sunbird Sunfire Tempest Trans Am Vibe Porsche 356 911 912 914 924 928 930 944 968 Boxster Cayenne Cayman Renault Rolls-Royce Saab 900 9000 9-2X 9-3 9-5 9-7x Saturn Ion L-Series S-Series Sky Vue Scion tC xA xB Shelby Studebaker Subaru Forester Impreza Legacy Outback SVX Tribeca Suzuki Toyota 4Runner Avalon Camry Celica Corolla FJ Cruiser Highlander Land Cruiser Matrix MR2 Paseo Previa Prius RAV4 Sequoia Sienna Solara Supra Tacoma Tercel Tundra Yaris Triumph Spitfire TR-6 Volkswagen Beetle (Pre-1998) Beetle - New (1998-Present) Bus Vanagon Cabrio EuroVan Golf Jetta Karmann Ghia Passat Phaeton Rabbit Thing Touareg Vanagon Volvo 240 740 850 940 C70 S40 S60 S70 S80 V40 V50 V70 XC Cross Country XC90 Willys

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