Electronics Toolbox Pro

Peter Ho

In-app purchases

About this app

Electronics Toolbox – All-in-One Electronic Calculator & Reference

The ultimate mobile toolkit for electronics engineers, hobbyists, students, and professionals!

Over 80 powerful tools & references in one clean, fast, and offline app. Whether you're designing circuits on the go, debugging in the lab, or learning electronics, this is the only app you'll ever need.



Basic tools
• Resistor color code
• Inductor color code
• Resistor SMD marking & EIA-96
• dBm, dbW, dBuV converter
• Resistors in series
• Resistors in parallel
• Two resistors in ratio
• Voltage divider
• Ohm's law
• Y-Δ converter
• L, C reactance
• Complex number operation
• RC charging time constant
• RC filter
• RL filter
• LC circuit
• 555 monostable
• 555 astable
• Wheatstone bridge
• Trace width calculator
• Battery capacity
• Operational amplifier
• LED calculator
• RMS calculator
• Range calculator
• Temperature conversion
• BJT bias voltage
• Voltage regulator
• Shunt regulator
• Length converter
• Limit 10 combinations of component values


Digital Tools
• Number converter
• Logic gates
• DAC R-2R
• Analog-to-digital
• 7-segment display
• Minimization of boolean function
• Half adder & full adder
• Synchronous counter up to 6 states
• Cyclic redundancy check CRC-8, CRC-16, CRC-32
• Hamming code


Electronics resources
• SI unit prefix
• Physical quantities
• Circuit symbol
• ASCII table
• 74xx series
• CMOS 40xx series
• Pinouts
• C programming language
• Python language
• Common linux command for Raspberry Pi
• Resistivity table
• Permeability table
• Permittivity table
• Ampacity table
• AWG table
• Standard wire guage (SWG) table
• World plug
• EDA software
• Flip-flop
• SMD marking
• Formulas

PRO Version Unlocks (one-time purchase)
• No limitation of component values
• Selectable 1%,5%,10%,20% of values
• Complex matrix
• Pi-pad attenuator
• T-pad attenuator
• Coil inductance
• Poles & zeros calculator
• More resources

Perfect for:
• Electronics students & teachers
• Hardware makers & Arduino/Raspberry Pi enthusiasts
• Professional engineers in the field
• Hobbyists building robots, amps, and drones
• Works 100% offline – no internet needed!
• Lightweight, super-fast, regularly updated with new tools.

Need a feature? Just email us – we listen to every suggestion.
Download now and supercharge your electronics workflow!


All trade names mentioned in this app or the other documentation provided by this app are trademarks or registered trademarks of their respective holder. This app is not related or affiliated in any way these companies.

Ratings and reviews

great app! but needs an UI update.

Let me start with the bad things about this app...... I really cannot find any. Really well done and well worth the little it costs for pro version. I still have the non pro version on my phone too.

This app is very in depth indeed, covers a heck of a lot. it's been very useful many a time. Well done for such a great help in the field of electronics. I would happily pay £5.00 for this app.

What’s new

5.6.60
- Fix minor bugs