OhmsLab: Ohms Law & Codes
Solve Ohm's law and power, decode 4, 5 and 6 band resistor colors, size LED resistors, and combine series or parallel. Save your work and export a bench sheet.
Download on theApp StoreThe everyday electronics bench in your pocket. Solve Ohm's law, read resistor color codes, and size LED resistors in seconds, all on your iPhone.
What It Does
- Ohm's law and power: enter any two of voltage, current, resistance or power and get the other two
- Resistor color decoder: 4, 5 and 6 band, with tolerance and temperature coefficient, drawn on a real resistor
- Find the colors for a value: enter a resistance and see the bands
- LED series resistor: from supply, forward voltage and current, with the nearest standard value and a power rating
- Series and parallel: combine any number of resistors, both totals at once
- Voltage divider: output voltage, current and power, plus a helper to size R2 for a target output
- Save any calculation to your bench and reopen it live
- Bench reference: the full color code table, SI prefixes and the Ohm's law relationships
- Copy any result, clean dark bench interface
Private by Design
Everything you enter stays on your iPhone. No account, no cloud, no tracking.
Free and Lifetime
Free includes the Ohm's law and power solver and the full resistor color decoder, with unlimited saved calculations. The one time Lifetime unlock (pay once, no subscription) adds the LED resistor, voltage divider, and series and parallel tools, plus PDF and CSV bench sheet export. The current price is shown in the app and on this page before you buy.
Built for makers, students, repair techs, and anyone who keeps a soldering iron warm.
A planning aid for hobby and bench work. Check part datasheets and ratings before you build.
More in this category
OhmsLab: Ohms Law & Codes does one job well, works offline, and keeps your data on this device. There is no cloud sync, no account, and nothing to sign up for.
Who it is for
OhmsLab: Ohms Law & Codes is for anyone who wants a dependable way to handle this without a spreadsheet or a complicated setup. It sits in the Utilities category on the App Store.
Private by design
No ads, no trackers, no data harvesting, and no cloud sync. Your entries stay on this device and never pass through our servers. There is a Delete All My Data control, so you stay in charge.
Common questions
What is OhmsLab: Ohms Law & Codes?
Solve Ohm's law and power, decode 4, 5 and 6 band resistor colors, size LED resistors, and combine series or parallel. Save your work and export a bench sheet.
Is OhmsLab: Ohms Law & Codes on the App Store?
Yes. It is available now on the App Store.
Does OhmsLab: Ohms Law & Codes work offline?
Yes. Everything runs on your device, so it works with no signal.
Does OhmsLab: Ohms Law & Codes work on iPad?
Yes. It is a universal app and runs natively on iPhone and iPad.
Does OhmsLab: Ohms Law & Codes include in-app purchases?
Some advanced features require an in-app purchase. The App Store shows the current choices, prices, and terms for your storefront before you confirm anything.
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