Electronics Engineer Helper
Calculators and references for beginners and professionals interested in electrical and electronics engineering, DIY and repair.
Tens of free tools, no sign up required
For all skill levels
Praised by thousands of users
Continuously updated since 2014


It seems like every time I click into this app I find a new feature that I didn't know was available previously. This app will definitely help everyone from a novice to expert in some way or another.
Amazing collection of tools, pin outs, data sheets search and others source with exactly images how look like the components, great job!!! Fully recommend!!!
Great app very useful save loads of time working on electronic
Quick and easy, my go to info source.
This is a good app as to do my work a little bit easier. Thanks!!!
Very useful and helpful. Showed the amperage for the gauge of the wire.
Quick, very user friendly, gives us complete reference profiles for rapid theoretical testing. This is now one of our main go to’s for active crossover testing.

Browse standard electronic schematic symbols

Find the right resistor for any LED string

Quickly find component datasheets without visiting multiple websites

Decode resistor values from color marking (4, 5 and 6 bands)

Reference pinouts for common interfaces and boards

Decode SMD component markings without difficulty

Accurate calculation of voltage, current, resistance and power
Convenient tool to design voltage divider circuits

Decypher and convert capacitor markings
More than 50 tools overall