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Resistor Calc Toolbox

LED & Resistor Calculators
Kevin Kuromi · Utilities
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App info

Developer
Kevin Kuromi
Category
Utilities, Education
Released
Oct 13, 2026
Version
1.0 (Oct 14, 2026)
Price
$2.99
Size
5.1 MB
Requires
iOS 17.6
Age rating
4+
Languages
English

In-app purchases

none
Current prices, App Store US.

About Resistor Calc Toolbox

Resistor Calc Toolbox is a simple, easy-to-use electronics utility for working with LEDs and 4-band resistors. Three calculators put commonly needed resistor information in one convenient app. LED Resistor Calculator Enter the supply voltage, LED forward voltage, and LED current to calculate the required resistance and minimum resistor power rating. Color Bands → Ohms Select the four resistor color bands to calculate the resistance value, tolerance, and tolerance range. Ohms → Color Bands Enter a resistance value and tolerance to find the corresponding 4-band resistor colors. Features • Three resistor tools in one app • LED resistance and power calculations • 4-band resistor color code decoding • Resistance-to-color-band conversion • Resistance tolerance range • Support for common resistor multiplier and tolerance colors • Clean, straightforward interface • Works on iPhone and iPad…
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