Resistor Pro
Jeffrey Yambao
About this app
- Age 10
- Updated Sep 16, 2025
- OS IOS
Editor reviews
Resistor Pro is a fast, accurate resistor calculator and electronics reference for students, makers, and engineers. Instantly decode resistor color bands and SMD markings, check standard E-series values, and calculate series or parallel combinations to hit your target resistance. Packed with practical circuit tools like Ohm’s Law, voltage divider, LED resistor, and power dissipation calculators, it helps you move from idea to prototype faster.
Core strengths include a clean, offline-ready interface, unit and tolerance support, closest E-series suggestions, and quick favorites for parts you use often. Ideal for bench work, repairs, and STEM learning, it combines a resistor color code calculator, SMD code lookup, and electronics calculators into one efficient toolkit. Keywords: resistor calculator, color code, SMD code, E12 E24 E96, electronics tool, circuit design, Ohm’s Law, engineering reference.
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How to use:
1. Download and open Resistor Pro, then choose a tool such as Color Code, SMD Code, Series/Parallel, or Ohm’s Law.
2. Enter inputs: tap band colors or type an SMD code, add resistor values for series or parallel, or set voltage/current for circuit calculators.
3. Review results: see resistance, tolerance, closest E-series match, and power estimates; copy or save to Favorites for quick reuse.
4. Adjust options: switch E-series families, change units, set preferred tolerances, and refine calculations to meet your design target.
5. Use advanced calculators as needed: voltage divider, LED resistor, and power dissipation to validate your circuit before building.