#1
Battery Capacity Calculator
Calculate required battery capacity in Ah, Wh, and kWh using load power, runtime, voltage, efficiency, depth of discharge, ageing, and reserve.
#2
Battery Charge Time Calculator
Estimate battery charging time from capacity, voltage, starting charge, target charge, charger amps or watts, efficiency, and charging taper.
#3
Electrical Horsepower Calculator
Calculate electrical horsepower from voltage, current, power factor, phase, and efficiency for DC, single-phase, and three-phase circuits.
#4
Inductor Calculator
Calculate inductive reactance, stored energy, inductance, and RL time constant with instant unit conversions using this free online inductor calculator.
#5
Parallel Resistor Calculator
Calculate equivalent resistance for parallel resistors in ohms, kilo-ohms, or mega-ohms. Add voltage to find total current, power, and branch currents.
#6
RC Time Constant Calculator
Calculate RC time constant, capacitor charge and discharge voltage, cutoff frequency, and response time with automatic unit conversions.
#7
Series Resistor Calculator
Calculate total resistance, circuit current, voltage drops, and resistor power for series circuits with mixed ohm, kilo-ohm, and mega-ohm values.
#8
Solar Battery Size Calculator
Calculate solar battery bank size in kWh and Ah using daily energy use, backup days, voltage, depth of discharge, efficiency, and reserve.
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