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Electrical Engineering Calculators

Explore a range of electrical engineering calculators designed to assist with circuit analysis, power calculations, impedance, current, voltage, resistance, and more. Whether you’re a student, technician, or professional engineer, these tools provide accurate results for solving complex electrical equations and designing efficient systems. Easy to use and ideal for both learning and real-world application.

T Matching Network

This calculator determines the component values for a T-network impedance matching circuit, typically used in RF and antenna design to match a source impedance to a load impedance using two series reactances and one shunt reactance.

Zener Diode Resistor

This calculator determines the ideal series resistor value for a Zener diode voltage regulator based on input voltage, Zener voltage, and current requirements. It’s useful for designing simple voltage stabilization circuits.

Stripline PCB Differential Impedance

This calculator estimates the differential impedance of a stripline pair based on trace impedance, spacing, and dielectric height. It’s crucial for differential signal design in high-speed multilayer PCBs such as USB, HDMI, and PCIe.

Young’s Modulus Spring Resonant Frequency

This calculator estimates the resonant frequency of a spring using geometric parameters, material density, and modulus of rigidity (G). It is ideal for evaluating coil spring dynamics in precision mechanical, automotive, and vibration systems.

Stripline Impedance

This calculator estimates the characteristic impedance of a stripline trace embedded between two ground planes on a PCB. It uses the trace width, thickness, dielectric constant, and spacing to help engineers design impedance-controlled circuits.

Wire Gauge

This calculator converts wire diameter into the corresponding American Wire Gauge (AWG) size. It’s useful for electrical engineers, hobbyists, and technicians who need to identify or select wire sizes based on diameter.

Straight Wire Inductance

This calculator estimates the inductance of a straight round wire based on its length and diameter. It is useful in RF design, antenna modeling, and low-frequency inductive analysis where conductor shape affects circuit behavior.

Spring Mass

This calculator estimates the mass of a spring based on its material density and volume. It is useful in mechanical design and vibration analysis where spring weight affects system dynamics.

Spring Resonant Frequency

This calculator determines the resonant frequency of a mass-spring system based on the mass and spring constant. It’s essential for analyzing mechanical vibrations, oscillations, and tuning dynamic systems in engineering and physics.

Specific Work of Gas Turbine

This calculator determines the net specific work output of a gas turbine by subtracting the compressor work from the turbine work. It is essential for analyzing turbine efficiency, energy output, and thermodynamic performance in jet engines and power generation systems.

Specific Work

This calculator determines the specific work done during compression or expansion processes, based on fluid density and pressure difference. It’s useful in thermodynamics, fluid mechanics, and energy system analysis.

Quality Factor in Optical Systems

This calculator determines the optical quality factor (Q-factor) of resonant systems, such as optical cavities or waveguides, using the resonant frequency and bandwidth. It’s essential for evaluating energy retention and sharpness of resonance in photonics, lasers, and telecommunications.

Physical Properties of Coil

This calculator determines key physical characteristics of a coil, such as total wire length, weight, resistance, and turns per unit length, based on wire diameter, coil dimensions, and material type. It’s useful for coil winding, transformer design, and inductive component prototyping.

PI Network Impedance Matching

This calculator helps design a PI matching network to match a source impedance (Rs) with a higher load impedance (Rl). It calculates the quality factor and reactance values required for impedance transformation using capacitive and inductive elements.

PCB Microstrip Crosstalk

This calculator estimates the crosstalk between parallel microstrip traces on a PCB using spacing and height parameters. It outputs the result in decibels (dB) to assess signal interference in high-speed circuit designs.

Microstrip PCB Impedance

This calculator determines the characteristic impedance of a microstrip trace on a PCB based on its width, substrate height, and dielectric constant. It is crucial for maintaining signal integrity in high-speed digital and RF PCB designs.

Parallel Wire Impedance

This calculator determines the characteristic impedance of a parallel wire transmission line based on conductor diameter, spacing, and dielectric constant. It’s essential for designing balanced RF lines like twin-lead cables, antennas, and low-loss feeders.

Parallel Resistance

This calculator determines the total resistance of multiple resistors connected in parallel. It’s useful in electrical and electronic circuit design to reduce resistance, distribute current, or achieve specific resistance values.

Parallel Inductance

This calculator computes the total inductance of multiple inductors connected in parallel. It’s useful in circuit design where lower overall inductance is needed by combining individual coils.

Speaker Sound Q

This calculator determines the total quality factor (Q) of a speaker based on its electrical and mechanical properties. It’s commonly used in speaker enclosure design to assess how a driver responds near its resonant frequency, affecting bass response and system damping.

Solenoid Coil Electromagnetic Force

This calculator estimates the electromagnetic force (EMF) produced by a solenoid coil based on the number of turns, current, core material, and solenoid dimensions. It’s ideal for designing actuators, relays, valves, and magnetic lifting devices.

Single Phase Transformer

This calculator helps determine the primary and secondary voltage or current in a single-phase transformer based on turns ratio, input/output parameters, and power rating. It’s useful for power engineers, electricians, and students working with AC power systems.

Series Inductance

This calculator determines the total inductance of inductors connected in series. It’s useful in circuit design, filter creation, and power electronics where inductive components are combined to achieve a specific total value.

RF Power Density

This calculator estimates the power density (W/m²) of a radio frequency (RF) source based on its transmitted power and distance from the source. It’s useful for assessing radiation exposure, designing antennas, and ensuring compliance with safety standards.

Real and Reactive Power

This calculator computes real power (kW), reactive power (kVAR), and apparent power (kVA) based on voltage, current, and power factor. It’s useful in electrical engineering for analyzing power flow, correcting power factor, and designing efficient AC systems.

R1 R2

This calculator computes the individual resistances R1 and R2 based on the measured values of external earth impedance Z_e and total system impedance Z_s. It’s commonly used in electrical safety testing and circuit protection design.

mA/h Power Consumption

This calculator estimates the total energy usage of a device in milliamp-hours (mAh) by multiplying its current draw (mA) by the number of hours it operates. It’s helpful for evaluating battery life and designing energy-efficient systems.

Inverse Discrete Fourier Transform

This calculator performs the Inverse Discrete Fourier Transform (IDFT) to convert a set of frequency domain components back into a discrete time-domain signal. It’s useful in signal processing, digital communication, and audio engineering applications.

Number of Turns in Transformer Coil

This calculator helps determine the number of turns required in the primary or secondary winding of a transformer based on input voltage, output voltage, core cross-sectional area, and frequency. It’s essential for transformer design in power supplies, audio, and high-frequency applications.

NE555 Timer Astable Circuit

This calculator helps design an astable multivibrator circuit using the NE555 timer IC by calculating the output frequency, time period, and duty cycle from resistor and capacitor values. It’s ideal for creating clocks, blinkers, tone generators, and pulse-width modulated signals.

Helical Antenna

This calculator helps determine the key design parameters of a helical antenna, including its total length, number of turns, spacing, and gain based on frequency and diameter. It’s commonly used in satellite communication, aerospace, and radio telemetry.

Nichrome Wire

This calculator estimates the resistance, power, and current of a nichrome wire based on its length, diameter, and operating voltage. It’s widely used in heating element design, such as for toasters, 3D printer hotends, and DIY heating coils.

IC 555 Astable Timer

This calculator helps determine the output frequency, period, and duty cycle of an astable multivibrator using a 555 timer IC. It’s widely used in electronics for creating oscillators, blinkers, clocks, and PWM signals.

Microstrip Transmission Lines Impedance

This calculator estimates the characteristic impedance of microstrip transmission lines based on trace width, substrate height, and dielectric constant. It’s essential for designing high-speed PCBs and RF circuits where impedance matching is critical.

Microstrip Differential Impedance

This calculator estimates the differential impedance of a pair of microstrip traces on a PCB, based on trace width, spacing, dielectric constant, and substrate height. It’s essential for designing high-speed differential signal lines like USB, HDMI, and LVDS.

Microstrip Impedance From Zo

This calculator determines the required microstrip trace width or substrate height based on a desired characteristic impedance (Zo), dielectric constant, and board thickness. It’s essential for impedance-controlled PCB layout in RF and high-speed digital design.

Microstrip Impedance

This calculator determines the characteristic impedance of a microstrip transmission line based on trace width, substrate height, and dielectric constant. It’s essential for RF PCB design, signal integrity, and impedance-controlled routing.

mA/h Power Consumption

This calculator estimates the power consumption of a device in milliamp-hours (mAh) based on the current draw and usage time. It’s helpful for battery life analysis, device power budgeting, and designing energy-efficient electronics.

LM317 Current Regulator

This calculator determines the output current of an LM317 constant current regulator circuit using a single resistor. It’s useful for LED drivers, battery chargers, and current-limited power supplies where a stable current is required.

LM317 Voltage and Resistor

This calculator helps you determine the output voltage or required resistor values for the LM317 adjustable voltage regulator. Ideal for electronics engineers and DIY hobbyists working with power supply design, battery chargers, or custom voltage outputs.

KVA to Amps

This calculator converts kilovolt-amperes (kVA) to amperes (A) based on voltage and the number of phases. It’s useful for electrical engineers, technicians, and installers when sizing equipment, designing power systems, or configuring generators and transformers.

LED Series Resistor

This calculator helps you determine the correct resistor value needed in series with an LED to limit the current and prevent damage. It’s useful for electronics hobbyists, circuit designers, and engineers when building safe and reliable LED circuits.

Grounding Strap Inductance

This tool calculates the inductance of a flat grounding strap based on its length, width, and thickness. It’s useful in electrical grounding and EMC design, helping engineers reduce impedance and improve current return paths in high-frequency applications.

L Matching Network

This tool calculates the component values for an L-type impedance matching network, used to match source and load impedances in RF circuits. It's especially useful for antenna design, amplifier interfaces, and filter design to ensure maximum power transfer and minimal signal reflection.

90 Degree Mitered Corner

This tool helps you calculate the mitered length of a 90-degree bend in electrical conduit or pipe, factoring in bend height and elbow width. It’s essential for electricians and engineers to ensure precise layout and minimal material waste during conduit installations.

Three-Phase Power by Two Wattmeters

This calculator estimates the total active power in a three-phase system using the two-wattmeter method. It’s commonly used for both balanced and unbalanced load systems in electrical engineering. You can input line voltages, line currents, and the phase angle between voltage and current.

Horsepower to Watts Converter

This converter allows you to easily convert between horsepower (HP) and watts (W), two common units of power used in mechanical and electrical engineering. Choose the direction of conversion and input the known value to get the result instantly.

Air Core Coil Inductance

This calculator determines the inductance of an air core flat spiral coil based on its number of turns, inner and outer diameters. It’s commonly used in radio-frequency and PCB applications where coreless coils are required. It supports both imperial and metric units.

555 Timer

This 555 Timer calculator helps you determine the output pulse duration or time delay in monostable mode based on resistor (R) and capacitor (C) values. It’s useful for electronics students, hobbyists, and engineers working with timing circuits.