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Electrical & Solar
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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Electrical & Solar
Electricity Usage Calculator
Calculate electricity usage in kWh and estimate daily, monthly, and yearly energy costs using appliance power, hours, and electricity rate.
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Electrical & Solar
Motor Efficiency Calculator
Calculate motor efficiency, input power, output power and power loss instantly with this free motor efficiency calculator.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
RLC Circuit Calculator
RLC Circuit Calculator finds impedance, reactance, phase angle, resonant frequency and Q factor from resistance, inductance, capacitance and AC frequency.
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Electrical & Solar
Impedance Calculator
Calculate RLC circuit impedance, inductive and capacitive reactance, phase angle, and total impedance instantly with this free calculator.
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Electrical & Solar
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.
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Electrical & Solar
Capacitive Reactance Calculator
Calculate capacitive reactance from frequency and capacitance instantly using our free XC calculator with Hz, kHz, pF, nF and µF units.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Construction
Log Weight Calculator
Log Weight Calculator estimates weight per log, total load, volume and tons from diameter, length, wood species, quantity and moisture adjustment.
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Construction
Firewood Calculator
Firewood Calculator finds stacked volume, full cords, face-cord equivalents, cubic meters and estimated cost from your woodpile dimensions and cord price.
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Construction
Patio Paver Calculator
Patio Paver Calculator estimates pavers, waste, border pieces, patio area and cost from your patio size, paver dimensions, waste allowance and price.
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Construction
Driveway Gravel Calculator
Driveway Gravel Calculator estimates cubic yards, tons, truckloads, bags and cost, with single-layer or 3-layer planning from your driveway dimensions.
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Construction
Drainage Slope Calculator
Use our Drainage Slope Calculator to calculate pipe slope, grade percentage, fall, rise, and drainage drop quickly and accurately.
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Construction
Fertilizer Calculator
Fertilizer Calculator estimates product weight, bags, N-P-K nutrients, allowance and cost from treatment area, fertilizer grade and target nutrient rate.
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Construction
Grass Seed Calculator
Grass Seed Calculator estimates seed weight, bags, leftover seed and cost for new lawns or overseeding from lawn area, seed rate, allowance and bag size.
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Construction
Acoustic Panel Calculator
Acoustic Panel Calculator estimates panel count, target coverage, boxes, waste, absorption area and material cost from your room and panel dimensions.
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Construction
Ceiling Tile Calculator
Ceiling Tile Calculator estimates tiles, boxes, waste, grid, perimeter trim and material cost from room size, openings, tile dimensions and pricing.
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