Precision calculators for the bench.
Fast, accurate tools for embedded, hardware, and electronics engineers. Zero sign-up. Zero ads over interactive controls. Just the exact numbers you need.
Engineering Tool Directory
Grouped by electronics domain. Select a tool to start calculating.
Resistance & Passives
Decode 4, 5, and 6-band resistor color bands or reverse-calculate bands from any standard resistance value with tolerance and tempco.
Decode 3-digit (5%), 4-digit (1%), and EIA-96 precision surface-mount resistor codes with reverse lookup and chip visualization.
Decode 3-digit ceramic disc and film capacitor markings into pF, nF, and µF with tolerance letter codes and voltage ratings.
Decode 4-band and 5-band axial RF molded inductors and 3-digit SMD power inductor codes in microhenries (µH) with tolerance ratings.
Compute total equivalent resistance and capacitance for series and parallel networks with an arbitrary number of components.
Power & Timing
Solve for Voltage, Current, Resistance, or Power given any two known parameters using standard electrical engineering equations.
Calculate output voltage, ratio, and resistor values for unloaded and loaded voltage dividers with standard E-series recommendations.
Calculate RC time constant (τ), step response settling time, -3dB cutoff frequency (fc), and low-pass/high-pass filter attenuation.
Calculate oscillation frequency, period, high/low times, and duty cycle for 555 astable oscillators and monostable one-shot pulse widths.
Estimate runtime for battery-powered circuits considering nominal capacity, average or duty-cycled load current, and chemistry efficiency derating.
PCB & Layout
Calculate internal and external PCB trace width for target current, allowed temperature rise, copper thickness, and trace resistance.
Look up American Wire Gauge (AWG 0000 to 40) diameter, area, resistance per foot/meter, chassis ampacity, power transmission ampacity, and voltage drop.