#1
AC Power Calculator
AC Power Calculator finds real, apparent and reactive power, phase angle and power factor from RMS voltage, current and leading or lagging power factor.
#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
Frequency to Wavelength Calculator converts Hz, kHz, MHz or GHz to wavelength using light, sound, water or custom wave speed, with multiple length units.
#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
kWh Cost Calculator estimates energy cost, fixed charges and total cost from Wh, kWh or MWh usage, electricity rate, currency and repeated billing periods.
#14
Inverter Size Calculator
Inverter Size Calculator estimates VA, kVA, surge requirement, safety margin and battery current from load, power factor, efficiency and battery voltage.
#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
LED Lighting Calculator estimates fixture count, required lumens, total watts and power density from room size, target lux, light output, UF and MF.
#17
Lumens to Watts Calculator
Motor Efficiency Calculator estimates efficiency, power loss, loss percentage and output-to-input ratio from electrical input and mechanical output power.
#18
Motor Current Calculator
Motor Current Calculator estimates full-load amps for single- or three-phase AC motors from power, voltage, efficiency and power factor, with HP support.
#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
Parallel Capacitor Calculator finds total equivalent capacitance from two or more values, with automatic conversion across pF, nF, µF, mF and F units.
#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
Resistor Combination Calculator finds equivalent resistance for series or parallel networks using multiple resistor values in Ω, kΩ or MΩ with mixed units.
#23
Resistor Power Calculator
Resistor Power Calculator finds power, voltage, current and resistance from any two known values, with unit conversion and a suggested wattage rating.
#24
RLC Circuit Calculator
RLC Circuit Calculator finds impedance, reactance, phase angle, resonant frequency and Q factor from resistance, inductance, capacitance and AC frequency.
#25
Series Capacitor Calculator
Series Capacitor Calculator finds equivalent capacitance for two or more capacitors in series, with automatic conversion across pF, nF, µF, mF and F.
#26
Single-Phase Power Calculator
Single-Phase Power Calculator calculates watts, VA, VAR, phase angle and load impedance from RMS voltage, current, power factor and AC frequency.
#27
Solar Charge Controller Calculator
Solar Charge Controller Calculator finds charge current, controller amps, safety margin and PV current from solar watts, battery voltage and efficiency.
#28
Solar System Size Calculator
Solar System Size Calculator estimates PV size, panel count, daily and annual generation, and battery capacity from energy use, sun hours and efficiency.
#29
Speaker Impedance Calculator
Speaker Impedance Calculator calculates total load in ohms for identical speakers wired in series or parallel using speaker impedance and speaker count.
#30
Voltage Divider Calculator
Voltage Divider Calculator calculates Vout, divider current, R1 voltage drop and resistor power from input voltage and R1/R2 values with unit conversion.
#31
Watts to kWh Calculator
Watts to kWh Calculator converts watts or kilowatts and operating time into Wh, kWh and estimated cost, with quantity and electricity rate support.
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