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Description
Resistor Calculator is the essential tool for electronics engineers, hobbyists, makers, and students. Instantly decode resistor color bands, calculate circuit values, and look up standard resistor values — all in one app.
RESISTOR COLOR CODE CALCULATOR
• Support for 4-band, 5-band, and 6-band resistors
• Tap color bands on a realistic resistor graphic to read values instantly
• View resistance, tolerance, min/max range, and temperature coefficient
• Intuitive color picker with all standard EIA color codes
REVERSE LOOKUP
• Enter a resistance value and get the matching color band combination
• Find the closest standard value from E-series tables
• Perfect for designing circuits and selecting components
SERIES & PARALLEL CALCULATOR
• Calculate total resistance for resistors in series or parallel
• Add unlimited resistors with engineering notation input (e.g. 4.7k, 2.2M)
• See live results with formula reference
VOLTAGE DIVIDER
• Solve for output voltage (Vout) or unknown resistor (R2)
• Interactive circuit diagram updates in real time
• Supports engineering notation for quick input
E-SERIES REFERENCE LIBRARY
• Browse standard resistor values from E12, E24, E48, E96, and E192 series
• Search and filter values instantly
• Tap to copy any value to clipboard
DESIGNED FOR ENGINEERS
• Clean, distraction-free interface
• Works on iPhone and iPad
• No ads, no subscriptions, no internet required
• Haptic feedback for a responsive experience
Whether you are building your first LED circuit or designing professional PCBs, Resistor Calculator Pro gives you fast, accurate answers right on your device. Download now and keep the most useful resistor tool in your pocket.
Resistor Parameters:
Band Digit
Black - 0
Brown - 1
Red - 2
Orange - 3
Yellow - 4
Green - 5
Blue - 6
Violet - 7
Grey - 8
White - 9
Band Multiplier
Black × 1 Ω
Brown × 10 Ω
Red × 100 Ω
Orange × 1 kΩ
Yellow × 10 kΩ
Green × 100 kΩ
Blue × 1 MΩ
Violet × 10 MΩ
Gold × 0.1 Ω
Silver × 0.01 Ω
Band Tolerance
Brown - 1%
Red - 2%
Gold - 5%
Silver - 10%
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, divide voltages, bias active elements, and terminate transmission lines, among other uses. A resistor opposes the flow of electrical current; the higher the value of the resistor, the more it opposes the current flow. Values are given in ohms.
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Estimates
Availability
Devices
iPhone3GS
iPadWifi
iPad3G
iPhone4
iPodTouchThirdGen
iPodTouchFourthGen
iPad2Wifi
iPad23G
iPhone4S
iPadThirdGen
iPadThirdGen4G
iPhone5
iPodTouchFifthGen
iPadFourthGen
iPadFourthGen4G
iPadMini
iPadMini4G
iPhone5c
iPhone5s
iPadAir
iPadAirCellular
iPadMiniRetina
iPadMiniRetinaCellular
iPhone6
iPhone6Plus
iPadAir2
iPadAir2Cellular
iPadMini3
iPadMini3Cellular
iPodTouchSixthGen
iPhone6s
iPhone6sPlus
iPadMini4
iPadMini4Cellular
iPadPro
iPadProCellular
iPadPro97
iPadPro97Cellular
iPhoneSE
iPhone7
iPhone7Plus
iPad611
iPad612
iPad71
iPad72
iPad73
iPad74
iPhone8
iPhone8Plus
iPhoneX
iPad75
iPad76
iPhoneXS
iPhoneXSMax
iPhoneXR
iPad812
iPad834
iPad856
iPad878
iPadMini5
iPadMini5Cellular
iPadAir3
iPadAir3Cellular
iPodTouchSeventhGen
iPhone11
iPhone11Pro
iPadSeventhGen
iPadSeventhGenCellular
iPhone11ProMax
iPhoneSESecondGen
iPadProSecondGen
iPadProSecondGenCellular
iPadProFourthGen
iPadProFourthGenCellular
iPhone12Mini
iPhone12
iPhone12Pro
iPhone12ProMax
iPadAir4
iPadAir4Cellular
iPadEighthGen
iPadEighthGenCellular
iPadProThirdGen
iPadProThirdGenCellular
iPadProFifthGen
iPadProFifthGenCellular
iPhone13Pro
iPhone13ProMax
iPhone13Mini
iPhone13
iPadMiniSixthGen
iPadMiniSixthGenCellular
iPadNinthGen
iPadNinthGenCellular
iPhoneSEThirdGen
iPadAirFifthGen
iPadAirFifthGenCellular
iPhone14
iPhone14Plus
iPhone14Pro
iPhone14ProMax
iPadTenthGen
iPadTenthGenCellular
iPadPro11FourthGen
iPadPro11FourthGenCellular
iPadProSixthGen
iPadProSixthGenCellular
Pricing by country
| Country | Price |
|---|---|
| Canada | 3.99 CAD |
| China | 22 CNY |
| France | 2.99 EUR |
| Germany | 2.99 EUR |
| Italy | 2.99 EUR |
| Netherlands | 2.99 EUR |
| Portugal | 2.99 EUR |
| Spain | 2.99 EUR |
| Poland | 2.29 EUR |
| UK | 2.99 GBP |
| India | 299 INR |
| Japan | 500 JPY |
| Korea, Republic Of | 4400 KRW |
| Poland | 14.99 PLN |
| Russia | 249 RUB |
| Turkey | 149.99 TRY |
| USA | 2.99 USD |
| Korea, Republic Of | 2.19 USD |
| Ukraine | 3.99 USD |
Version History
Latest: 2.5
- Optimized for the latest devices.
- Fixed minor bugs.
- Improved and redesigned the UI.
v1.9
1 week ago