- Battery Life EstimatorModel runtime from battery capacity, sleep draw, and active draw, in whatever units your datasheet uses.runtime estimatormAh to hoursbattery runtime
- Ohm's Law & LED CalculatorSolve voltage, current, resistance, and power, plus LED resistor and voltage divider math.
- Resistor Color Code CalculatorDecode 3, 4, 5, and 6 band resistor color codes into resistance and tolerance, or encode a target resistance into bands.4 band resistor
- Wire Gauge CalculatorLook up AWG and metric wire sizes, calculate voltage drop over a run, and find the smallest gauge that meets ampacity.awg chartwire size for ampsawg to mm2ampacity chart
- 555 Timer CalculatorCalculate astable and monostable 555 timer frequency, duty cycle, pulse width, and component values, with a wiring sketch.astable calculator555 duty cycle
- Capacitor Code DecoderDecode 3-digit and letter capacitor codes into capacitance, tolerance, voltage rating, and reactance, or generate a code from a target value.smd capacitor code
- LED Resistor CalculatorWork out the current-limiting resistor for an LED from supply and forward voltage, with nearest E12, E24, and E96 standard values in both directions.led resistor value
- PCB Trace Width CalculatorCalculate IPC-2221 trace width for a target current, copper weight, and temperature rise, or the max current a given width can carry.
- Voltage Divider CalculatorWork out output voltage, resistor values, loaded-divider sag, and common-supply ratio tables for a two-resistor divider.resistor dividerr1 r2 calculatorpotential divider