27 available tools
Electrical and Electronics Tools
Calculate circuits, resistors, AC power, voltage drop, batteries, solar energy, and electronics with transparent formulas.
De-energize circuits before working on them. Results do not replace manufacturer documentation, measurements, or local code.
Available tools
Circuits and resistors
Power and wiring
Batteries and solar
Electronics and signals
Ohm's Law Calculator
Calculate voltage, current, resistance, and power from two known electrical values.
Voltage Divider Calculator
Calculate output voltage, current, and resistor power in a resistive divider.
Series Resistor Calculator
Add series resistors and find their equivalent resistance.
Parallel Resistor Calculator
Calculate equivalent resistance for multiple parallel resistors.
Resistor Color Code Calculator
Decode 4, 5, or 6-band resistors including tolerance and temperature coefficient.
LED Resistor Calculator
Calculate resistor value and power rating to limit LED current.
Voltage Drop Calculator
Estimate copper or aluminum voltage drop for DC, single-phase, or three-phase circuits.
Wire Gauge Calculator
Estimate minimum conductor area from voltage-drop limits and compare standard sizes.
Single-Phase Power Calculator
Calculate single-phase real, apparent, reactive power, and current.
Three-Phase Power Calculator
Calculate balanced three-phase power using line-to-line voltage.
Power Factor Calculator
Find power factor, reactive power, and phase angle from watts and volt-amperes.
Electricity Cost Calculator
Estimate appliance energy use in kWh and cost using your own electricity rate.
Battery Runtime Calculator
Estimate ideal and adjusted battery runtime using efficiency and depth of discharge.
Battery Capacity Calculator
Calculate required Wh and Ah for a load and target runtime.
Ah to Wh Converter
Convert between amp-hours and watt-hours using battery voltage.
Inverter Size Calculator
Estimate continuous and surge inverter ratings with configurable headroom.
Solar Panel Calculator
Estimate solar-array wattage and panel count from daily energy and peak sun hours.
Battery Charging Time Calculator
Estimate ideal and adjusted charging time from capacity, current, and efficiency.
RC Time Constant Calculator
Calculate tau and the approximate five-time-constant interval for an RC circuit.
Capacitive Reactance Calculator
Calculate a capacitor's reactance at a given frequency.
Inductive Reactance Calculator
Calculate an inductor's reactance at a given frequency.
LC Resonance Calculator
Calculate the ideal resonant frequency of an LC circuit.
Frequency Wavelength Calculator
Convert frequency and wavelength with a configurable velocity factor.
RMS Peak-to-Peak Converter
Convert RMS, peak, and peak-to-peak values for a sine wave.
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Circuits, power, and conductors
Solve voltage, current, resistance, and power relationships; compare resistor networks and estimate voltage drop. Wire calculations are technical references that must be checked against ampacity, protection, and local code.
Batteries, solar, and electronics
Size energy and runtime with explicit losses, or analyze RC constants, reactance, resonance, waveforms, and ideal transformers. Each page explains its model's units and assumptions.
Frequently asked questions
Do these calculators replace professional electrical review?
No. They are educational references. Real installations require checking safety, protection, components, environmental conditions, and applicable code.
Which units do they use?
Every field displays its unit. Electronics formulas use the stated units and results preserve their magnitude.