Calculate the correct series resistor needed to safely power light-emitting diodes. Input supply voltage, LED voltage drop, current, and the number of LEDs to find the required resistor value and wattage.
5.0(6 ratings)
$2.99
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3.9 avg rating
6 free apps
Updated July 2026
Whether you want more options like RC Gear Ratio Picker or a completely different take on the same concept, our curated list of 33+ similar apps has you covered. Updated for 2026 with the latest ratings and comparisons.
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This app helps hand-loaders develop and create new or existing loads. It features a large database of cartridges, components, and custom options for rifles and handguns. Easily search and combine components to find the perfect setup.
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This app offers a suite of specialized calculators for RC car enthusiasts. It helps with gear ratios, suspension geometry, corner weights, oil viscosity, fuel usage, and top speed estimations. It also stores data for multiple cars and includes helpful guides.
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This utility app simplifies the calculation of final drive ratios for RC cars. It allows for offline calculations and provides insights into how different gear ratios affect acceleration, speed, motor load, and battery life.
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