LED resistors, circuits, wires and power.
Free electronics tools: LED resistor, series and parallel components, RC time constant, 555 timer, wire gauge, voltage drop, battery life and PCB trace calculators. All 22 tools below are free, run entirely in your browser, and need no sign-up.
Free LED series resistor calculator. Enter supply voltage, LED forward voltage and current to get the exact resistor value, nearest E12 size and power rating.
Free LED array calculator. Design series and parallel LED strings for a given supply voltage, with per-string resistor values, total current and layout advice.
Free parallel resistor calculator. Enter any number of resistor values and get the total equivalent resistance using the reciprocal parallel formula instantly.
Free series resistor calculator. Add any list of resistor values in ohms and get the total series resistance instantly, since series resistors simply add up.
Free capacitor combination calculator. Enter capacitor values and choose series or parallel to get the total capacitance, using the correct add or reciprocal rule.
Free RC time constant calculator. Enter resistance and capacitance to get tau, the 63 percent charge time and the time to reach 5 tau or full charge.
Free LC resonant frequency calculator. Enter inductance and capacitance to get the resonant frequency of a tuned tank circuit using f = 1 / (2 pi sqrt(LC)).
Free 555 timer calculator for astable and monostable modes. Enter resistors and capacitor to get frequency, period, duty cycle or one shot pulse width.
Free AWG wire gauge calculator. Convert American Wire Gauge to diameter and cross section area, or find the gauge for a diameter, with metric and imperial output.
Free wire resistance calculator. Enter length, cross section area and material to get the total resistance of a conductor using resistivity, for copper or aluminium.
Free voltage drop calculator for wire runs. Enter length, current, wire cross section and material to get the voltage lost and percentage drop over the cable.
Free battery life calculator. Enter battery capacity in mAh and device current draw to estimate how many hours or days your battery will last before recharge.
Free amp hour calculator. Convert between ampere hours, watt hours and battery voltage, and work out energy capacity for any battery pack or cell.
Free reactance calculator. Enter frequency and an inductor or capacitor value to get the inductive or capacitive reactance in ohms for AC circuit design.
Free transformer turns ratio calculator. Enter primary and secondary voltages or turns to get the turns ratio, output voltage and reflected current.
Free PCB trace width calculator. Enter current, copper thickness and allowed temperature rise to get the minimum trace width for internal or external layers.
Free watts to amps calculator. Enter power in watts and voltage to get the current in amps for DC and single phase AC circuits, with power factor support.
Free amps to watts calculator. Enter current in amps and voltage to get the power in watts for DC and single phase AC loads, with optional power factor.
Free dBm to watts converter. Convert between dBm, watts and milliwatts for RF and signal power, both directions, using the standard logarithmic relationship.
Free solar battery sizing calculator. Enter daily load, sun hours, system voltage and days of autonomy to size the solar array and battery bank you need.
Free current divider calculator. Enter total current and two parallel resistors to find how the current splits between each branch using the current divider rule.
Free capacitor energy calculator. Enter capacitance and voltage to get the stored energy in joules and the charge in coulombs using E = half C V squared.
Yes. Every electronics tool on yourhack.ai is completely free, with no sign-up and no usage limits.
Yes. They run in any modern web browser on phone, tablet or desktop. There is nothing to install.
Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.
There are currently 22 free electronics tools here, and we add more regularly.