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Physics & Engineering
Escape Velocity Calculator
Calculate escape velocity, mass, or radius using gravitational formulas with multiple units for planets, moons, and other objects.
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Physics & Engineering
Gravitational Force Calculator
Gravitational Force Calculator finds force, either mass or center-to-center distance using Newton’s law, with unit conversion and scientific notation.
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Physics & Engineering
Free Fall Calculator
Calculate free fall time, final velocity, or distance using gravity, height, and initial velocity with this accurate physics calculator.
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Physics & Engineering
Displacement Calculator
Displacement Calculator finds position change, initial position or final position using Δx = x₂ − x₁, with automatic conversion across common length units.
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Physics & Engineering
Velocity Calculator
Calculate velocity, distance, or time instantly. Enter distance and time with multiple unit options including m/s, km/h, mph, and ft/s.
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Physics & Engineering
Mechanical Advantage Calculator
Calculate ideal and actual mechanical advantage using effort force, load force, effort distance, and load distance with this free calculator.
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Physics & Engineering
Efficiency Calculator
Free online Efficiency Calculator to find efficiency percentage from input & output values instantly. Fast, accurate, and easy to use.
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Electrical & Solar
Power Calculator
Calculate power from work and time instantly. Free Power Calculator with formulas, unit conversions, examples, explanations, and FAQs.
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Physics & Engineering
Work Calculator
Work Calculator finds mechanical work in joules from force, displacement and angle using W = F × d × cos(θ), with common force and distance units.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
Ground Wire Size Calculator
Calculate recommended ground wire size from circuit amperage. Get AWG and copper grounding conductor guidance quickly.
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Electrical & Solar
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.
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Electrical & Solar
EV Charger Size Calculator
Calculate EV charger size in kW and amps from battery capacity, target charging time, voltage, efficiency and safety margin.
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Electrical & Solar
EV Charging Time Calculator
Calculate EV charging time from battery size, current charge, target charge, charger power and efficiency with this free calculator.
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Electrical & Solar
Battery C-Rate Calculator
Calculate battery C-rate, charge or discharge time, power and energy from current, capacity and voltage with this free calculator.
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Electrical & Solar
Battery Energy Calculator
Calculate battery energy in Wh and kWh from voltage, amp-hours, quantity, usable capacity and efficiency with runtime estimates.
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Electrical & Solar
Inverter Size Calculator
Inverter Size Calculator estimates VA, kVA, surge requirement, safety margin and battery current from load, power factor, efficiency and battery voltage.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
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.
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Electrical & Solar
kWh Cost Calculator
Calculate electricity cost from kWh usage and your rate per kWh. Estimate daily, monthly, or yearly energy expenses instantly.
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