electrical Calculators
Ohm's Law Calculator
Find voltage, current, or resistance instantly using Ohm's Law. Essential for electronics hobbyists, electricians, and students designing or troubleshooting circuits.
Electrical Power Calculator
Calculate electrical power in watts from voltage and current readings. Used by electricians, engineers, and DIYers to size fuses, cables, and power supplies correctly.
Wire Gauge Calculator
Determine the minimum wire gauge needed to limit voltage drop in any electrical run. Ideal for electricians and solar installers sizing cables for long wiring runs.
Capacitive Reactance Calculator
Calculate capacitive reactance (Xc) for a capacitor in an AC circuit at a given frequency. Used by engineers and students analyzing filters, tuned circuits, and impedance matching.
Inductive Reactance Calculator
Calculate inductive reactance (XL) for a coil or inductor in an AC circuit at any frequency. Used in RF design, transformer analysis, and filter circuit development.
Electricity Cost Calculator
Estimate the monthly electricity cost of any appliance by entering its wattage, daily usage hours, and your utility rate. Ideal for budgeting energy bills or comparing the running costs of devices.
Transformer Turns Ratio Calculator
Determine a transformer's turns ratio from its primary and secondary voltages in seconds. Use this when designing power supplies, selecting step-up or step-down transformers, or verifying transformer specifications.
Circuit Breaker Sizing Calculator
Find the correct circuit breaker rating for any electrical load by entering the full-load current and a safety factor. Use this during panel design, home wiring projects, or electrical code compliance checks.
LED Resistor Calculator
Calculate the exact current-limiting resistor value needed to safely power an LED from any supply voltage. Use this whenever wiring LEDs to avoid burning them out from excess current.
Three Phase Power Calculator
Compute the total real power delivered by a three-phase AC system from line voltage, line current, and power factor. Essential for engineers sizing motors, generators, and industrial electrical panels.
Ohm's Law & Power Calculator
Solve for voltage, current, resistance, or power in any DC circuit by entering just two known electrical values. Ideal for electronics hobbyists, electricians, and students checking circuit designs.
Wire Gauge & Ampacity Calculator
Determine the minimum wire cross-sectional area (in mm²) needed to safely carry a given current over a set distance without exceeding your allowed voltage drop. Essential for wiring solar systems, EV chargers, and long cable runs.
Electrical Load Calculator
Compute the total electrical demand of a building by summing lighting, appliance, HVAC, and motor loads, then applying an NEC-compliant demand factor. Used by electricians and engineers to size service panels and main breakers.
Power Factor Correction Capacitor Calculator
Find the exact capacitor size in µF needed to correct a lagging power factor to a target value in AC electrical systems. Widely used by electrical engineers designing industrial motor circuits and utility billing compliance solutions.
Motor Full Load Current Calculator
Calculate the full load current (FLA) drawn by a single-phase or three-phase AC motor from its horsepower, voltage, efficiency, and power factor. Used for selecting fuses, breakers, wire gauges, and motor starters.
Transformer Sizing Calculator
Determine the required KVA rating for a transformer based on connected load, voltage levels, load factor, and future growth. Use this when specifying or replacing a transformer for commercial or industrial installations.
Conduit Fill Calculator
Calculate the percentage of conduit fill for a given wire gauge, wire count, and conduit size to ensure NEC compliance. Use this before pulling wire to avoid overheating and code violations.
Electrical Energy Cost Calculator
Estimate monthly electricity costs for any device or facility by entering power consumption, daily run time, and utility rates including demand charges. Ideal for energy audits, equipment budgeting, and utility bill forecasting.
Short Circuit Current Calculator
Calculate the available short-circuit fault current at any point in a three-phase electrical system, accounting for transformer impedance and cable length. Use this for sizing breakers, fuses, and switchgear to meet NEC and ANSI interrupt ratings.
Wire Size Calculator
Find the minimum wire cross-sectional area in circular mils needed to keep voltage drop within code limits for any DC or single-phase AC circuit. Use this when wiring long runs to panels, subpanels, motors, or outdoor equipment.
Ohm's Law Calculator
Solve for voltage, current, resistance, or power in any DC circuit using Ohm's Law. Essential for electronics hobbyists, electricians, and engineering students troubleshooting circuits.
Solar Panel System Calculator
Estimate how many solar panels you need to cover your home's electricity usage based on your location's sun hours and panel specs. Ideal for planning a residential rooftop solar installation.
Electrical Load Calculator
Determine the total electrical demand of a building and the minimum service panel size needed to support it safely. Used by electricians and contractors during new construction or renovation planning.
Motor Starting Current Calculator
Calculate the full-load running current of a three-phase AC motor from its horsepower, voltage, and efficiency ratings. Useful for selecting circuit breakers, wire gauge, and motor starters.
Battery Backup Time Calculator
Find out how long a battery bank will power your equipment during an outage, given voltage, capacity, and inverter efficiency. Ideal for sizing UPS systems, off-grid setups, and emergency power installations.
Conduit Fill Calculator
Determines the minimum conduit diameter needed for a given number and gauge of wires per NEC fill rules. Use it when planning new electrical runs to avoid code violations and overheating.
Power Factor Correction Calculator
Calculates the reactive power (kVAR) of capacitors needed to raise a facility's power factor to a target value. Use it to reduce utility demand charges and improve electrical system efficiency.
Voltage Drop Calculator
Computes the voltage drop across a wire run given current, one-way distance, wire gauge, and conductor material. Essential for ensuring devices receive adequate voltage at the end of long cable runs.
Capacitor Energy Storage Calculator
Calculates the energy stored, charge held, or RC time constant for a capacitor given its capacitance, voltage, and series resistance. Useful for power supply design, timing circuits, and energy storage projects.
LED Series Resistor Calculator
Finds the correct series resistor value and power rating to safely drive one or more LEDs in series from a given supply voltage. Use it whenever you connect LEDs to a voltage source without a dedicated driver.
Transformer Calculator
Determine the primary current draw of a transformer given its output voltage, output current, and efficiency. Use this when sizing transformers for power supplies, HVAC systems, or industrial equipment.
Battery Runtime Calculator
Estimate how many hours a battery will power a device based on its capacity, discharge depth, and system efficiency. Ideal for sizing backup power, solar storage, and portable electronics.
Wire Ampacity Calculator
Find the safe current-carrying capacity of a copper or aluminum wire based on AWG size, ambient temperature, and number of bundled conductors. Essential for NEC-compliant circuit design.
Three Phase Power Calculator
Calculate the real output power (kW) of a three-phase electrical system from line voltage, line current, power factor, and efficiency. Use it for motor sizing, generator selection, and load analysis.
Voltage Drop Calculator
Calculate the percentage voltage drop along a conductor run based on current, one-way distance, wire gauge, and system voltage. Use it to ensure circuits meet the NEC's 3% voltage-drop guideline.
Transformer Sizing Calculator
Determine the minimum transformer kVA rating needed for a given electrical load, accounting for demand factor, power factor, safety margin, and ambient temperature derating. Use this when specifying or replacing distribution transformers on new or existing electrical systems.
Electrical Panel Load Calculator
Estimate the total ampere demand on an electrical panel by applying NEC-style load factors to lighting, receptacle, appliance, and motor circuits, then check it against the panel's main breaker rating. Ideal for panel schedule design, load additions, and service upgrade evaluations.
Short Circuit Current Calculator
Compute the available short-circuit current (ASCC) at a fault point downstream of a transformer, accounting for transformer impedance and cable impedance to the fault location. Use this to verify that breakers and fuses have a sufficient interrupting rating.
Conduit Fill Calculator
Calculate the percentage of a conduit's interior cross-sectional area occupied by wires and check it against NEC fill limits. Use this when planning new conduit runs or adding conductors to existing conduit.
Battery Bank Sizing Calculator
Calculate the total battery bank capacity in amp-hours (Ah) needed for off-grid solar systems or backup power, factoring in autonomy, depth of discharge, and system efficiency losses. Use this when designing or expanding a battery-based energy storage system.