Home/Electronics
Electronics Tools
LED resistors, circuits, wires and power. 22 free tools, no sign-up.
LED Series and Parallel Array CalculatorDesign series and parallel LED strings for a given supply voltage, with per-string resistor values, total current and layout advice.Transformer Turns Ratio CalculatorEnter primary and secondary voltages or turns to get the turns ratio, output voltage and reflected current.LED Resistor CalculatorEnter supply voltage, LED forward voltage and current to get the exact resistor value, nearest E12 size and power rating.Resistors in Parallel CalculatorEnter any number of resistor values and get the total equivalent resistance using the reciprocal parallel formula instantly.Resistors in Series CalculatorAdd any list of resistor values in ohms and get the total series resistance instantly, since series resistors simply add up.Capacitors in Parallel and Series CalculatorEnter capacitor values and choose series or parallel to get the total capacitance, using the correct add or reciprocal rule.RC Time Constant CalculatorEnter resistance and capacitance to get tau, the 63 percent charge time and the time to reach 5 tau or full charge.LC Resonant Frequency CalculatorEnter inductance and capacitance to get the resonant frequency of a tuned tank circuit using f = 1 / (2 pi sqrt(LC)).NE555 Timer CalculatorEnter resistors and capacitor to get frequency, period, duty cycle or one shot pulse width.Wire Gauge AWG CalculatorConvert American Wire Gauge to diameter and cross section area, or find the gauge for a diameter, with metric and imperial output.Wire Resistance CalculatorEnter length, cross section area and material to get the total resistance of a conductor using resistivity, for copper or aluminium.Voltage Drop CalculatorEnter length, current, wire cross section and material to get the voltage lost and percentage drop over the cable.Battery Life CalculatorEnter battery capacity in mAh and device current draw to estimate how many hours or days your battery will last before recharge.Ampere Hour and Watt Hour CalculatorConvert between ampere hours, watt hours and battery voltage, and work out energy capacity for any battery pack or cell.Inductive and Capacitive Reactance CalculatorEnter frequency and an inductor or capacitor value to get the inductive or capacitive reactance in ohms for AC circuit design.PCB Trace Width CalculatorEnter current, copper thickness and allowed temperature rise to get the minimum trace width for internal or external layers.Watts to Amps CalculatorEnter power in watts and voltage to get the current in amps for DC and single phase AC circuits, with power factor support.Amps to Watts CalculatorEnter current in amps and voltage to get the power in watts for DC and single phase AC loads, with optional power factor.dBm to Watts ConverterConvert between dBm, watts and milliwatts for RF and signal power, both directions, using the standard logarithmic relationship.Solar Panel and Battery Sizing CalculatorEnter daily load, sun hours, system voltage and days of autonomy to size the solar array and battery bank you need.Current Divider CalculatorEnter total current and two parallel resistors to find how the current splits between each branch using the current divider rule.Capacitor Energy and Charge CalculatorEnter capacitance and voltage to get the stored energy in joules and the charge in coulombs using E = half C V squared.
No electronics tool matches that. Try the search at the top for all tools.
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 are free, run entirely in your browser, and need no sign-up.
Launches in Developer Tools
See all →
Solo Stack Kits - Free Claude Code Config Tools12 free browser-only Claude Code config builders and checkers. No signup.solostackkits.netlify.app
CheckWebPerforms site audit with performance, security, accessibility, and legal checks.checkwebs.fr
myideBrowser agentic IDE — writes, verifies UI, publishesmyide.tech
SendHQTransactional email API for developers and AI agentssendhq.cc
Agentic Coding KitGuardrails, hooks, and subagent patterns that keep AI coding assistants on the rails.kitforgedev.itch.io
FixerCodeHTTP, web, and software error code referencefixercode.comFrequently asked questions
Are these electronics tools free?
Yes. Every electronics tool on yourhack.ai is completely free, with no sign-up and no usage limits.
Do these electronics tools work on mobile?
Yes. They run in any modern web browser on phone, tablet or desktop. There is nothing to install.
Is my data private?
Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.
How many electronics tools are there?
There are currently 22 free electronics tools here, and we add more regularly.