Newest Calculators

Electrical and Energy

RC Time Constant Calculator

RC Time Constant Calculator finds tau, charging and discharging voltage, cutoff frequency and response time from resistance, capacitance, voltage and time.

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Electrical and Energy

Inductor Calculator

Inductor Calculator finds reactance, inductance, stored energy and RL time constant with unit conversion and clear formula steps for circuit analysis.

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Electrical and Energy

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.

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Electrical and Energy

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.

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Electrical and Energy

Battery Charge Time Calculator

Estimate battery charging time from capacity, voltage, starting charge, target charge, charger amps or watts, efficiency, and charging taper.

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Electrical and Energy

Battery Capacity Calculator

Calculate required battery capacity in Ah, Wh, and kWh using load power, runtime, voltage, efficiency, depth of discharge, ageing, and reserve.

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Electrical and Energy

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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Electrical Calculators

Generator Size Calculator

Calculate the right generator size in kW and kVA using appliance loads, starting watts, power factor and a safety margin for home or business use.

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Electrical Calculators

Appliance Energy Cost Calculator

Estimate appliance electricity use and running cost by wattage, usage time, quantity, standby power, duty cycle, tariff, and carbon factor.

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Electrical Calculators

Circuit Breaker Size Calculator

Calculate a recommended circuit breaker size from load current or power. Supports DC, single-phase, three-phase, continuous loads and standard ratings.

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Electrical Calculators

Transformer Calculator

Calculate transformer voltage, current, turns ratio, winding turns, VA rating, real power, efficiency loss, and single- or three-phase load current.

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Electrical Calculators

LED Resistor Calculator

Calculate the correct resistor for single LEDs, series strings, or parallel branches. Get a standard resistor value, wattage, current, and circuit details.

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Chemistry Calculators

Thermal Expansion Calculator

Thermal Expansion Calculator finds linear, area and volume expansion from size, temperature change and material coefficient, with clear final dimensions.

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Chemistry Calculators

Heat Transfer Calculator

Heat Transfer Calculator finds conduction, convection and overall heat flow in watts, kW and BTU/hr using temperature, area, conductivity and thickness.

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Chemistry Calculators

Specific Heat Calculator

Specific Heat Calculator solves heat energy, mass, temperature change or heat capacity using q = mcΔT, material presets, unit conversions and clear steps.

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Chemistry Calculators

Refractive Index Calculator

Calculate refractive index using light speed or Snell's law. Get instant, accurate results with formulas, examples, explanations, and FAQs.

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Chemistry Calculators

Decibel Calculator

Decibel Calculator measures sound intensity, pressure, power ratios, combined noise levels and distance changes for accurate, easy-to-read dB results.

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Chemistry Calculators

Sound Intensity Calculator

Sound Intensity Calculator finds intensity, power, distance and decibel level with flexible units, inverse-square formulas and clear acoustic results.

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Chemistry Calculators

Wave Period Calculator

Calculate wave period from frequency, wavelength and speed, or total time and cycles. Get accurate results in seconds, milliseconds, and more.

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Chemistry Calculators

Wave Frequency Calculator

Calculate wave frequency, period, wavelength, wave speed and angular frequency instantly with accurate formulas and multiple unit options.

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Chemistry Calculators

Angular Velocity Calculator

Angular Velocity Calculator converts angle, time, RPM, frequency, period or speed and radius into rad/s, deg/s, RPM and hertz for precise rotation results.

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Chemistry Calculators

Centripetal Force Calculator

Calculate centripetal force, acceleration, angular velocity, and orbital period using mass, speed, and radius with multiple unit options.

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Electrical Calculators

Capacitor Calculator

Calculate capacitance, stored energy, charge, RC time constant, cutoff frequency, equivalent capacitance, and AC capacitor size with formulas.

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Chemistry Calculators

Projectile Motion Calculator

Calculate projectile range, flight time, maximum height, velocity components, and impact speed using launch speed, angle, and height.

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