#1
AC Power Calculator
Calculate AC real power, apparent power, reactive power and phase angle using voltage, current and power factor with this free calculator.
#2
Antenna Length Calculator
Calculate antenna length from frequency for quarter-wave, half-wave, full-wave and dipole antennas. Get results in meters, cm, feet and inches.
#3
Battery C-Rate Calculator
Calculate battery C-rate, charge or discharge time, power and energy from current, capacity and voltage with this free calculator.
#4
Battery Energy Calculator
Calculate battery energy in Wh and kWh from voltage, amp-hours, quantity, usable capacity and efficiency with runtime estimates.
#5
Capacitive Reactance Calculator
Calculate capacitive reactance from frequency and capacitance instantly using our free XC calculator with Hz, kHz, pF, nF and µF units.
#6
Electricity Usage Calculator
Calculate electricity usage in kWh and estimate daily, monthly, and yearly energy costs using appliance power, hours, and electricity rate.
#7
EV Charger Size Calculator
Calculate EV charger size in kW and amps from battery capacity, target charging time, voltage, efficiency and safety margin.
#8
EV Charging Time Calculator
Calculate EV charging time from battery size, current charge, target charge, charger power and efficiency with this free calculator.
#9
Frequency to Wavelength Calculator
Convert frequency to wavelength instantly in meters, centimeters, millimeters, feet and inches using selectable wave propagation speed.
#10
Fuse Size Calculator
Calculate the recommended fuse size from current or power, voltage and safety factor. Fast fuse sizing calculator for DC and AC circuits.
#11
Ground Wire Size Calculator
Calculate recommended ground wire size from circuit amperage. Get AWG and copper grounding conductor guidance quickly.
#12
Impedance Calculator
Calculate RLC circuit impedance, inductive and capacitive reactance, phase angle, and total impedance instantly with this free calculator.
#13
Inductive Reactance Calculator
Calculate inductive reactance from frequency and inductance instantly with our free XL calculator supporting Hz, kHz, µH, mH and H units.
#14
Inverter Size Calculator
Calculate recommended inverter size in watts, VA and kVA using load, surge, efficiency, power factor and safety margin.
#15
kWh Cost Calculator
Calculate electricity cost from kWh usage and your rate per kWh. Estimate daily, monthly, or yearly energy expenses instantly.
#16
LED Lighting Calculator
Calculate required LED lights, lumens and total wattage for a room using area, target lux, lamp output and lighting factors.
#17
Lumens to Watts Calculator
Convert lumens to watts using luminous efficacy. Estimate LED, CFL, halogen, incandescent, or custom lamp power instantly.
#18
Motor Current Calculator
Calculate motor current for single-phase and three-phase motors using power, voltage, efficiency and power factor with this free calculator.
#19
Motor Efficiency Calculator
Calculate motor efficiency, input power, output power and power loss instantly with this free motor efficiency calculator.
#20
Parallel Capacitor Calculator
Calculate total capacitance of capacitors connected in parallel instantly. Add multiple values in pF, nF, µF, mF, or F.
#21
Power Calculator
Calculate power from work and time instantly. Free Power Calculator with formulas, unit conversions, examples, explanations, and FAQs.
#22
Resistor Combination Calculator
Calculate equivalent resistance for series and parallel resistor combinations instantly with our free and easy resistor combination calculator.
#23
Resistor Power Calculator
Calculate resistor power, voltage, current, and resistance instantly using Ohm's law with our free Resistor Power Calculator.
#24
RLC Circuit Calculator
Calculate RLC circuit impedance, reactance, phase angle and resonance frequency instantly using resistance, inductance, capacitance and frequency.
#25
Series Capacitor Calculator
Calculate total capacitance of capacitors connected in series instantly with our free and easy Series Capacitor Calculator.
#26
Single-Phase Power Calculator
Calculate single-phase AC power, current, VA, VAR and phase angle using voltage, current and power factor with this free electrical calculator.
#27
Solar Charge Controller Calculator
Calculate solar charge controller amps from panel wattage, battery voltage, efficiency and safety margin for MPPT or PWM systems.
#28
Solar System Size Calculator
Estimate solar system size, panel count and daily generation using energy usage, sun hours, efficiency and panel wattage.
#29
Speaker Impedance Calculator
Calculate total speaker impedance for series or parallel wiring. Enter speaker ohms and quantity to get the final impedance instantly.
#30
Voltage Divider Calculator
Use our Voltage Divider Calculator to quickly calculate output voltage, circuit current, and resistor voltage drops using R1, R2, and input voltage.
#31
Watts to kWh Calculator
Convert watts to kWh using appliance power and operating time. Calculate energy consumption and estimated electricity cost instantly.
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