Resistor Calculator & Ohms Law vs Resistor Code Calculator Pro

The complete resistor toolkit for makers, students, hobbyists, and engineers. Decode color bands, SMD codes, and run Ohm's Law calculations — all in one fast, beautifully designed app. No internet required, no ads, no tracking. KEY FEATURES - Color Band Decoder — Full support for 4, 5, and 6-band resistors. Tap any band to change its color and watch the value update instantly with tolerance range. - Reverse Lookup — Enter a resistance value in Ω, kΩ, or MΩ and instantly see the matching color bands at your preferred tolerance (±1%, ±2%, ±5%, ±10%). - SMD Code Decoder — Handles all four major formats: 3-digit (like 103 = 10 kΩ), 4-digit (like 1002 = 10 kΩ), R-notation (like 4R7 = 4.7 Ω), and precision EIA-96 codes (like 01A = 100 Ω). - Ohm's Law Calculator — Calculate voltage, current, resistance, or power from any two known values. Every formula combination supported: V=IR, I=V/R, P=VI, P=V²/R, P=I²R. - Favorites & History — Save frequently-used values to favorites. Recent calculations are kept in your history automatically. - E-Series Standards — Visual indicators show when a value matches the standard E6, E12, or E24 series — perfect for BOM verification and component selection. - Dark & Light Mode — Auto-adapts to your system theme. Easy on the eyes whether you're soldering at midnight or debugging in daylight. - 10 Languages — English, Turkish, German, Spanish, French, Italian, Russian, Portuguese, Japanese, Chinese. PERFECT FOR - Electronics hobbyists and makers - Engineering and electronics students - Arduino, Raspberry Pi, and DIY enthusiasts - Field technicians and repair professionals - Educators teaching electronics - Anyone working with through-hole or SMD resistors Built with care by Deve Apps — software that respects you.

Resistor Calculator is a practical offline toolbox for electronics students, makers, repair technicians, and engineers who work with resistors and common circuit calculations. Decode resistor color bands, convert resistance values into color bands, read SMD resistor markings, browse E-Series values, and solve everyday resistor-related circuit problems in one focused app. RESISTOR TOOLS • Decode 3, 4, 5, and 6-band resistors • Convert resistance values into color bands • Support engineering notation such as 4.7k, 4k7, 2M2, and 0R22 • Calculate tolerance, minimum, and maximum resistance • Show temperature coefficient for 6-band resistors • Reverse resistor reading direction • Copy, share, save, and reset results SMD RESISTOR CODES • Decode 3-digit and 4-digit SMD codes • Support R, K, and M notation • Support EIA-96 markings • Handle zero-ohm resistors • Convert resistance values back into suitable SMD codes • Explain decoded values clearly E-SERIES VALUES • Browse E6, E12, E24, E48, E96, and E192 values • Find the nearest standard resistor values • Compare error and tolerance ranges • Open selected values directly in resistor tools CIRCUIT CALCULATORS • Series and parallel resistance • Ohm’s Law • Voltage divider • LED current-limiting resistor • Target resistance combinations • Wheatstone bridge • Op-amp gain • Star / Delta conversion • Wire resistance • Voltage drop • Pull-up / Pull-down resistor • RC time constant LIBRARY WORKFLOW • Save calculation history • Add results to Favorites • Organize values and calculations into Projects • Export project data as CSV, JSON, or plain text • Review saved calculations later BUILT FOR DAILY ELECTRONICS WORK Resistor Calculator is designed to be fast, clear, and focused. Results update immediately as you enter values, and formulas are available when you need to understand how a calculation was made. All core calculations run on your device and the app works without an account or internet connection.