Offline calculators
Circuit calculations, formulas, assumptions, units, and practical warnings without an account or internet dependency.
Products
Android app
EE Toolbox
Offline electronics calculators, formulas, references, saved results, and scan-assisted component lookup for electrical engineering students, technicians, makers, and embedded developers.
21 calculators
Local electronics tools
Ohm’s Law
Voltage Divider
LED Resistor
RC Filter Cutoff
LC Resonance
555 Timers
Op-Amp Gain
ADC and DAC
Resistor Codes
Saved work
Save calculations, add notes, search past results, favorite tools, and reopen saved inputs when a design changes.
Scan assistance
Camera OCR and barcode capture help read component markings and labels on supported Android devices.
Local-first privacy
Calculations, settings, favorites, scan text, and saved results stay in app storage on the device.
Engineering disclaimer
EE Toolbox provides practical calculation aids and references. Results should be verified against datasheets, standards, measurements, and professional judgment for critical or safety-related work.