Practical engineering calculators
Use focused calculators for everyday electrical and electronics work, including voltage dividers, circuit timing, passive filters and attenuation networks.
Browse engineering tools
15 calculators across 4 categories. Choose a category or open a tool below.
Electrical design
Quick calculations for common AC or DC circuit relationships, loading and practical component values.
- Estimate conductor cross-section from current, length, material, temperature and allowable voltage drop.
Wire gauge calculator
- Convert balanced line and phase voltage or current for delta and wye systems, with apparent power references.
Three-phase delta–wye calculator
- Relate real, reactive and apparent power, estimate line current and calculate an ideal correction requirement.
Power factor calculator
- Calculate unloaded and loaded divider output, current, power and practical resistor pairs.
Voltage divider calculator
- Calculate inductive or capacitive reactance, or solve for frequency and component value.
Reactance calculator
Timing, filters & safety
Explore time-dependent circuit behavior, basic filter response and capacitor discharge requirements.
- Calculate RC and RL time constants and common response intervals.
Time constant calculator
- Calculate RC, RL and ideal LC cutoff frequency, response and target component values.
Low-pass & high-pass filter calculator
- Calculate monostable pulse width, astable frequency, duty cycle and practical timing values.
555 timer calculator
- Estimate capacitor discharge time, remaining voltage, stored energy and bleeder resistor requirements.
Capacitor safety discharge calculator
Components & coding
Decode component markings and convert common capacitance or resistance values.
- Decode common three-digit, four-digit and EIA-96 resistor markings.
SMD resistor code calculator
- Decode common capacitor value codes, direct unit markings and tolerance suffixes.
SMD capacitor code calculator
- Convert capacitance values between farads, millifarads, microfarads, nanofarads and picofarads.
Capacitance conversion
RF attenuation
Calculate common passive attenuator networks from impedance and target attenuation.
Use calculation results as engineering guidance
Verify results against the applicable product documentation, installation requirements, safety factors and local standards before specifying equipment or carrying out electrical work.