PCB Tools & Calculators
Standards-based calculators that run entirely in your browser — no account required.
Signal Integrity
90 Degree Mitered Corner
Calculate the miter length for a 90 degree PCB trace corner.
Open calculator →Microstrip PCB Differential Impedance
Calculate the differential impedance of a microstrip PCB trace pair.
Open calculator →Microstrip PCB Impedance
Calculate the characteristic impedance, capacitance, propagation delay, and inductance per unit length of a microstrip PCB trace.
Open calculator →Microstrip Impedance
Calculate the impedance, propagation delay, inductance, capacitance, and resistance of a microstrip trace.
Open calculator →
Microstrip Impedance From Zo
Calculate the microstrip trace width required to achieve a target characteristic impedance.
Open calculator →
Microstrip Transmission Lines Impedance
Calculate the characteristic impedance of a microstrip transmission line using the narrow or wide trace formula.
Open calculator →PCB Differential Impedance
Calculate the differential impedance of a PCB trace pair.
Open calculator →Stripline Impedance
Calculate the characteristic impedance, capacitance, propagation delay, and inductance of a PCB stripline.
Open calculator →Stripline PCB Differential Impedance
Calculate the differential impedance of a coupled stripline PCB trace pair.
Open calculator →Transmission Lines
Coaxial Cable Impedance
Calculate the impedance, cutoff frequency, capacitance, inductance, and velocity of propagation of a coaxial cable.
Open calculator →
Parallel Wire Impedance
Calculate the impedance, inductance, capacitance, and propagation delay of a parallel wire transmission line.
Open calculator →Power
AC Power
Calculate AC power, voltage, or current for single-phase and three-phase systems.
Open calculator →
Ah to kWh Conversion
Convert battery capacity from amp-hours (Ah) to watt-hours (Wh) and kilowatt-hours (kWh).
Open calculator →Bias
Calculate the bias current in mA and A for vacuum tube amplifiers.
Open calculator →
Cable Size
Calculate the minimum copper and aluminium wire size (AWG/MCM) based on voltage drop and ampacity.
Open calculator →
Copper Loss
Calculate the total copper loss in a transformer from primary and secondary winding currents and resistances.
Open calculator →
DC Power
Calculate DC power, voltage, or current using P = V × I.
Open calculator →
Electrical Power Factor
Calculate the AC circuit power factor from real power and reactive power.
Open calculator →
Electricity Cost
Calculate energy consumption and electricity cost per day, month, and year for any appliance.
Open calculator →
Flyback SMPS
Calculate key parameters of a flyback switched-mode power supply transformer.
Open calculator →
Horsepower and Watts Conversion
Convert between horsepower (HP) and watts for electrical, mechanical, and metric HP types.
Open calculator →
kVA to Amps
Convert kilovolt-amps (kVA) to amps given the voltage.
Open calculator →
mA/h Power Consumption
Calculate the average current consumption from battery capacity and estimated hours of use.
Open calculator →
Real and Reactive Power
Calculate real and reactive power for single-phase or three-phase AC circuits.
Open calculator →
Single Phase Transformer
Calculate kVA, voltage, or current for a single-phase transformer.
Open calculator →
Weight of Transformer Windings
Calculate the weight of transformer windings from material density and volume.
Open calculator →
Three Phase Transformer
Calculate voltage, kVA, or current for a three-phase transformer.
Open calculator →
Three Phase Voltage by Two Wattmeters Method
Calculate three-phase power using the two-wattmeter measurement method.
Open calculator →
Transformer Current
Calculate the current drawn by a transformer from its power rating and voltage.
Open calculator →
Transformer Primary Conductor Size
Calculate the required conductor cross-sectional area from current and current density.
Open calculator →
Transformer Wire Length
Calculate the total wire length required for a transformer winding.
Open calculator →Passive Components
Capacitor Energy (E) and RC Time Constant
Calculate the RC time constant and stored energy of a capacitor.
Open calculator →
Figure of Merit
Calculate the Q factor (figure of merit) of an inductor from its reactance and resistance.
Open calculator →
LED Series Resistor
Calculate the series resistor value required to limit current through an LED.
Open calculator →
LM317 Current Regulator
Calculate the resistor value required to set the output current of an LM317 current regulator.
Open calculator →
R1 R2
Calculate the combined R1 and R2 resistance from a direct measurement and loop impedance.
Open calculator →
Parallel Resistance
Calculate the equivalent resistance of two resistors connected in parallel.
Open calculator →
Total Resistance of Series/Parallel Circuit
Calculate total resistance three ways from voltage, current, and power.
Open calculator →
Zener Diode
Calculate the series resistor value and power ratings for a zener diode voltage regulator.
Open calculator →Inductance
Air Core Flat Spiral Inductance
Calculate the inductance of an air core flat spiral coil in nanohenries.
Open calculator →
Copper Wire Self Inductance
Calculate the self inductance of a straight copper wire in nanohenries.
Open calculator →
Gapped Core Inductance
Calculate the inductance, inductance factor, and flux density of a gapped magnetic core.
Open calculator →Grounding Strap Inductance
Calculate the inductance of a flat grounding strap from its dimensions.
Open calculator →
Inductance of an Air Core Coil
Calculate the inductance of a single-layer air core coil using Wheeler's formula.
Open calculator →
Number of Turns in a Transformer Coil
Calculate the number of turns required in a transformer coil.
Open calculator →Physical Properties of Coil
Calculate the physical and electrical properties of a wound coil on a bobbin.
Open calculator →Series Inductance
Calculate the total inductance of inductors connected in series.
Open calculator →
Parallel Inductance
Calculate the total inductance of inductors connected in parallel.
Open calculator →
Solenoid Coil Electromagnetic Force
Calculate the electromagnetic force produced by a solenoid coil.
Open calculator →
Straight Wire Inductor
Calculate the inductance of a straight wire conductor.
Open calculator →
Toroid Inductance Per Turn
Calculate the inductance and core parameters of a toroidal inductor.
Open calculator →RF
Helical Antenna
Calculate the gain, impedance, dimensions, and beam characteristics of a helical antenna.
Open calculator →
L Matching Network
Calculate the inductor, capacitor, and Q factor for an L-network impedance matching circuit.
Open calculator →
PI Network Impedance Matching
Calculate the component values for a PI network impedance matching circuit.
Open calculator →
Quality Factor in Optical Systems
Calculate the quality factor (Q) of an optical resonator from resonant frequency, stored energy, and power dissipated.
Open calculator →
RF Power Density
Calculate the RF power density at a given distance from an antenna.
Open calculator →
Speaker Sound Q
Calculate the theoretical Q factor and directivity index of a loudspeaker from its coverage angles.
Open calculator →
T Matching Network
Calculate the component values for a T network impedance matching circuit.
Open calculator →
Voltage Standing Wave Ratio
Calculate reflection coefficient, reflected power, and mismatch loss from VSWR.
Open calculator →Crosstalk & Noise
Thermal
General
555 Timer
Calculate the time out delay for a 555 timer in monostable mode.
Open calculator →
8051 PIC Microcontroller Time Delay
Calculate timer TIC durations, max run-times, and reload values for 8051 PIC microcontrollers.
Open calculator →
Cable Force
Calculate the resultant force at the support of a cable under a uniform load.
Open calculator →
Cable Length
Calculate the total length of a catenary cable from its span and sag.
Open calculator →
Electric Potential Energy
Calculate the electric potential at a point due to a point charge.
Open calculator →
Electrical Admittance
Calculate the electrical admittance (conductance and susceptance) from resistance and reactance.
Open calculator →
Electrostatic
Calculate the electrostatic pressure on a conductor surface from the electric field strength.
Open calculator →
IC 555 Astable Timer
Calculate the high period, low period, frequency, and duty cycle of a 555 timer in astable mode.
Open calculator →
Instrumentation Amplifier
Calculate the output voltage of a three op-amp instrumentation amplifier.
Open calculator →
Inverse Discrete Fourier Transform
Calculate the Inverse Discrete Fourier Transform (IDFT) of up to 10 frequency-domain values.
Open calculator →
NE555 Timer Astable Circuit
Calculate the frequency, high time, low time, and duty cycle of a NE555 timer in astable mode.
Open calculator →Nichrome Wire
Calculate the resistance, power, current, and voltage of a nichrome wire heating element.
Open calculator →
Specific Work
Calculate the specific work of a pump/fan and turbine from primary and secondary pressures and fluid density.
Open calculator →
Specific Work of Gas Turbine
Calculate the specific work output of a gas turbine from pressure ratio, temperature, and gas properties.
Open calculator →
Spring Mass
Calculate the mass of a spring from its material density and volume.
Open calculator →
Spring Resonant Frequency
Calculate the resonant frequency of a spring-mass system.
Open calculator →
Stiffness
Calculate applied force, extension, or stiffness using Hooke's Law.
Open calculator →
Total Luminous Flux
Calculate the equivalent solid angle and total luminous flux of a conical light source.
Open calculator →
Volume of Conductor
Calculate the volume of a conductor from its length and cross-sectional area.
Open calculator →
Wire Diameter
Calculate the wire diameter from its cross-sectional area.
Open calculator →
Wire Gauge
Calculate the AWG wire gauge from wire diameter in inches.
Open calculator →
Young's Modulus Spring Resonant Frequency
Calculate the resonant frequency of a helical spring from its geometry and material properties.
Open calculator →