Resistor Calculator & Ohms Law
Resistor Color Band Calculator
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• NEW — Voltage Divider: output voltage, ratio, current and power at a glance, with an optional load.
• NEW — In-app language picker: change the app's language anytime, right from the menu.
• Added two new languages: Korean and Hindi.
• Polish and small fixes.
Thanks for using Resistor Code!
The developer, Alper Sumer Guc, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Alper Sumer Guc
- Size
- 5.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.6 or later.
- iPhone
Requires iOS 16.6 or later. - Mac
Requires macOS 13.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 11 more
- English, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Turkish
- Age Rating
4+
- 4+
- Copyright
- © 2026 www.deve.net