Design Tools

Look up wire diameter, cross-sectionalarea, and resistance

Calculate the time constant, charging,and discharging time of an RC circuit.

Easily estimate your coil's physical properties with our online calculator. Calculate wire length, total resistance, winding turns, and coil dimensions instantly. Perfect for inductor and electromagnet design.

Quickly calculate the total resistance of two or more parallel resistors

Calculate parallel plate capacitor capacitance quickly. Input plate area, distance, and dielectric constant (εr) to get accurate results in pF. Essential for PCB design and circuit analysis.

Beginner-friendly voltage divider calculator for calculating the output voltage of a resistive voltage divider circuit.

Equivalent conversion calculation forseries and parallel impedances.

Calculate the required series protective resistor value to drive an LED.

Easily determine bias and feedback resistors for inverting operational amplifier circuits. Calculate R2, R3, and R4 based on gain, Vout, and input voltage offsets.

Calculate feedback and bias resistors for non-inverting operational amplifier circuits. Easily determine R2, R3, and R4 for your circuit design needs.

Calculate skin depth for copper, aluminum, silver, gold, and other conductors across different frequencies. Useful for RF design, PCB traces, transformers, AC resistance, and EMI analysis.

Calculate R1, R2, and output voltage for adjustable voltage regulators, LM317 circuits, LDOs, and DC-DC feedback dividers with Vref and adjust current support.

Calculation of key parameters for SMPS(e.g.,Buck/Boost) topologies.

Calculate air core coil inductance from coil diameter, length, and turns. Useful for RF coils, filters, antennas, oscillators, resonant circuits, and inductor design.

Calculate LC resonant frequency, inductance, or capacitance for tank circuits, RF filters, oscillators, antenna tuning, and frequency-selective circuit design.

Convert kg to lbs and lbs to kg instantly with formulas, common conversion tables, and practical references for shipping weight, product specifications, engineering and general use.

Estimate HDMI cable compatibility by cable length, video mode, cable speed rating, cable construction, and adapter count. Check signal risk for 1080p, 4K, 8K, passive, active, and optical HDMI cables.

Calculate voltage drop, power loss, and maximum recommended length for USB cables based on cable type, current, voltage, and conductor AWG. Ideal for engineers, system designers, and DIY projects.

Calculate voltage deviation and check if a measured voltage is within allowed tolerance. Compare measured and nominal voltages, determine deviation percentage, acceptable range, and test status for DC and AC circuits, batteries, and power supplies.

Professional engineering tool for calculating the voltage at a resistor divider or test point, including output voltage and expected deviation under load.

Estimate battery charging time from capacity, charging current, charging efficiency, and charging profile factor. Calculate charge time in hours and minutes, effective charging current, C-rate, and refill capacity for rechargeable batteries.

Estimate battery life from capacity, load current, usable capacity, and voltage. Calculate runtime in hours and days, usable mAh, energy in Wh, and average power for battery-powered devices.

Convert MLCC case sizes between imperial EIA codes and metric codes. Quickly find equivalent package codes, nominal dimensions, and popular MLCC sizes for PCB design.

Calculate required decoupling capacitance, target impedance, effective MLCC count, total capacitance, and parallel ESR for IC power rail and PDN design.

Convert MLCC and SMD capacitor codes to capacitance values and vice versa, including 3-digit, 4-digit, R decimal, and tolerance codes.

Calculate the power dissipation of MLCCs based on RMS current and ESR, including duty cycle for pulsed or switching applications.

Calculate MLCC self-resonant frequency from capacitance and ESL, with reactance and minimum impedance estimates for decoupling and RF design.

Calculate the capacitive reactance (Xc) of MLCCs at specified frequencies for RF, filter, and decoupling applications.

Calculate the maximum safe DC voltage for MLCCs to maintain capacitance and avoid breakdown, considering dielectric type and target capacitance.

Calculate the effective capacitance of MLCCs under applied DC voltage, considering DC bias effect for accurate circuit design.

Calculate MOSFET and IGBT gate drive current, gate resistor, gate drive power, and switching time from gate charge, drive voltage, and switching frequency.

Calculate semiconductor power dissipation, temperature rise, junction temperature, thermal margin, and required thermal resistance for SCRs, MOSFETs, IGBTs, diodes, and regulators.

Calculate SCR gate trigger current, pulse width, and gate resistor for reliable SCR switching in power electronics applications.

Calculate required LDO thermal resistance, junction temperature, thermal margin, and allowed temperature rise from power dissipation and ambient conditions.

Calculate adjustable LDO output voltage or required feedback resistor values from Vref, R1, R2, and target output voltage.

Calculate LDO minimum input voltage, dropout headroom, and safety margin from output voltage, dropout voltage, and available input voltage.

Calculate LDO efficiency, input power, output power, voltage drop, and power loss from Vin, Vout, load current, and quiescent current.

Calculate LDO junction temperature, temperature rise, thermal margin, and maximum allowed power from power dissipation, ambient temperature, and θJA.

Calculate LDO power dissipation, efficiency, temperature rise, and junction temperature from Vin, Vout, load current, quiescent current, and thermal resistance.

Evaluate LDO regulator power dissipation, efficiency, dropout margin, quiescent current loss, ripple rejection, and current-limit margin.

Calculate buck converter duty cycle, inductor value, ripple current, output capacitor, input current, and power for step-down DC-DC regulator design.

Calculate full-wave, half-wave, quarter-wave, and eighth-wave antenna lengths from frequency with velocity factor adjustment for RF, dipole, monopole, and amateur radio antenna design.

Convert dBm to watts, milliwatts, and microwatts or convert power back to dBm. Useful for RF power, antennas, transmitters, receivers, and link budgets.

Instantly decode resistor color bands and SMD codes (3-digit and 4-digit). A must-have tool for electronics students and PCB designers for quick component identification.

Easily calculate the cutoff frequency for RC low-pass filters. Input your resistor and capacitor values for instant results. Perfect for electronics students and hobbyists.

Calculate microstrip line characteristic impedance (Z0) for high-speed PCB design. Accurate tool for trace width, dielectric height, and dielectric constant analysis. Essential for signal integrity engineers.

Use our professional IPC-2221 based PCB trace width calculator to determine the safe copper width for your electrical currents. Supports 1oz/2oz copper and internal/external layers.

Easily calculate R1, R2, and C values for your 555 timer circuits. Supports both Astable (oscillator) and Monostable (one-shot) modes with instant results. Ideal for electronics hobbyists and engineers.

Find coin and button cell battery equivalents by model number, voltage, chemistry, and size. Search common CR, BR, LR, AG, SR, 377, 364, 395, LR44, AG13, and SR626SW battery replacements in one reference tool.

A simple and accurate online tool to instantly convert temperatures between Celsius and Fahrenheit.

Calculate Pi and T RF attenuator resistor values from attenuation, impedance, and input power. Includes voltage ratio, output power, and RF design notes.

Convert return loss, VSWR, and reflection coefficient. Calculate reflected power, mismatch loss, accepted power, and RF match quality.

Calculate signal rise time from bandwidth, RC loading, source rise time, and oscilloscope bandwidth. Estimate measured rise time and required bandwidth.

Estimate propagation delay, velocity factor, delay per length, and skew for PCB traces, coaxial cables, twisted pairs, and custom transmission lines.

Calculate PCB trace resistance, voltage drop, power loss, and current density from length, width, copper thickness, temperature, and current.

Estimate coax cable attenuation, total RF loss, output power, and delivered power for RG-58, RG-174, RG-316, LMR-200, LMR-400, or custom cable loss.

Calculate free-space path loss, wavelength, and estimated received power from RF frequency, distance, transmit power, gains, and losses.

Calculate thermal noise power, system noise floor, RMS noise voltage, and estimated receiver sensitivity from bandwidth, temperature, noise figure, and required SNR.

Calculate RF link budget, free-space path loss, EIRP, received power, and link margin using Tx power, antenna gain, losses, and sensitivity.

Calculate RF link budget, free-space path loss, EIRP, received power, and link margin using Tx power, antenna gain, losses, and sensitivity.

Convert frequency to wavelength or wavelength to frequency using free-space speed or cable velocity factor. Includes period and quarter-wavelength reference.

Calculate coil or inductor self-resonant frequency from inductance and parasitic capacitance, with operating frequency margin and Q estimate.

Convert RMS, peak, peak-to-peak voltage and crest factor for sine, square, triangle, and custom waveform signals.

Convert resistor networks between star/wye and delta forms. Calculate equivalent RA, RB, RC or RAB, RBC, RCA values for circuit analysis.

Calculate three-phase real power, apparent power, reactive power, phase reference values, and estimated output power from voltage, current, power factor, and efficiency.

Calculate power factor, apparent power, reactive power, phase angle, and estimated kVAR correction for single-phase and three-phase electrical loads.

Convert RMS voltage to dBV, dBu, dBm, and voltage gain in dB. Calculate voltage level and power estimate into a selected load.

Calculate complex impedance for series or parallel RLC circuits, including real part, imaginary part, magnitude, phase angle, XL, and XC.

Calculate inductive reactance, capacitive reactance, net series reactance, and LC resonant frequency from frequency, inductance, and capacitance.

Calculate Q factor, resonant frequency, bandwidth, reactance, and operating-frequency Q for ideal series or parallel RLC circuits.

Estimate capacitor ESR power loss, ripple voltage, capacitive reactance, impedance magnitude, and temperature rise from ripple current and frequency.

Calculate transformer turns ratio, secondary turns, primary current, secondary current, and estimated output power from voltage, turns, VA rating, and efficiency.

Estimate photodiode TIA output voltage, dark-current offset, feedback pole bandwidth, input capacitance, and basic resistor noise for optical front-end design.

Calculate Zener diode series resistor range, suggested resistor, Zener current, Zener power, and resistor power from input voltage range and load current.

Calculate LED series and parallel strings, current-limiting resistor value, resistor power, total supply current, and design headroom for LED circuits.

Use this inductor color code calculator to estimate key values quickly. Includes formulas, input fields, results, FAQ, and engineering reference notes.

Find ideal and nearest allowed clock dividers, actual output frequency, period, and frequency error for MCU, FPGA, timer, SPI, and digital timing designs.

Calculate PLL PFD frequency, VCO frequency, output frequency, total ratio, and VCO range status from reference clock and M, N, P divider values.

Calculate actual SPI clock frequency from MCU peripheral clock and prescaler options. Find the best divider, clock error, period, bit time, and slave clock limit status.

Calculate I2C pull-up resistor minimum and maximum values from VCC, bus capacitance, rise-time limit, sink current, and selected resistor value.

Calculate UART ideal divider, programmed divider, actual baud rate, baud error percentage, and communication status from clock, target baud, and oversampling.

Convert binary, hexadecimal, decimal, and two's complement values with selectable bit width for embedded firmware, registers, and digital logic.

Calculate ideal DAC output voltage, LSB size, full-scale output, code range, and output percentage from resolution, Vref, code, gain, and offset.

Calculate ADC LSB size, quantization error, ideal digital code, ENOB-limited resolution, and input range from ADC bits and reference voltage.

Calculate cable voltage drop, load-end voltage, voltage drop percentage, power loss, and maximum length for DC, single-phase, and three-phase circuits.

Calculate load power, input power, energy use, power supply loss, and electricity cost from voltage, current, operating time, and efficiency.

Calculate shunt voltage, current sense resistor power, amplifier output, and tolerance/TCR error for current measurement circuits.

Estimate IGBT conduction loss, switching energy loss, total dissipation, loss dominance, and junction temperature for inverter and motor-drive applications.

Estimate MOSFET conduction loss, switching loss, gate-drive loss, total power dissipation, and junction temperature for power switching designs.

Calculate PWM duty cycle timing, period, on-time, off-time, average voltage, RMS voltage, and resistive load power from frequency and duty cycle.

Calculate crystal oscillator load capacitors from crystal CL, stray capacitance, and C1/C2 trial values. Estimate effective load capacitance and load error.

Calculate ideal Chebyshev Type I prototype g values and scaled LC components from filter order, passband ripple, cutoff frequency, and impedance.

Calculate ideal Butterworth filter prototype g values and scaled LC components for low-pass or high-pass filters from order, cutoff frequency, and impedance.

Calculate RC high-pass filter cutoff frequency, capacitive reactance, voltage gain, phase shift, output amplitude, and attenuation at a selected signal frequency.

Calculate ideal second-order Butterworth LC high-pass filter values from cutoff frequency and impedance. Find series capacitor, shunt inductor, and response notes.

Calculate ideal second-order Butterworth LC low-pass filter values from cutoff frequency and impedance. Find series inductor, shunt capacitor, and ideal roll-off.

Calculate ideal L-network matching values for real source and load resistances. Find loaded Q, series reactance, shunt reactance, inductor, and capacitor values.

Calculate reflection coefficient, VSWR, return loss, mismatch loss, and reflected power from source impedance and complex load impedance for RF matching analysis.

Calculate microstrip characteristic impedance, effective dielectric constant, propagation delay, guided wavelength, and electrical length from PCB trace geometry and substrate data.

Estimate grounded coplanar waveguide impedance, effective dielectric constant, propagation delay, wavelength, and electrical length for RF PCB layouts.

Estimate planar spiral inductor inductance, copper resistance, Q factor, inner dimension, and trace length from PCB spiral geometry.

Estimate PCB trace inductance over a ground plane using transmission-line impedance and propagation velocity.

Estimate PCB via inductance, parallel via reduction, inductive reactance, and L di/dt voltage from via geometry and switching edge data.

Estimate self-inductance and inductive reactance of a straight isolated round wire from length, diameter, and frequency.

Estimate loop inductance and reactance of two parallel round conductors from length, diameter, spacing, and frequency.

Convert flat phase-noise density over an offset range into integrated phase noise, RMS phase noise, RMS jitter, and RMS phase error.

Calculate OIP3, IIP3, IM3 product level, and input power from two-tone output power, IM3 suppression, and gain.

Calculate resonant frequency, inductance, capacitance, reactance, Q factor, and bandwidth for LC tank circuits.

Estimate starting values for a passive charge-pump PLL loop filter using loop bandwidth, charge pump current, VCO gain, damping factor, and divide ratio.

Calculate ideal resistor values for matched Pi and T RF attenuator pads and approximate nearest E24 resistor values.

Calculate camera field of view from sensor size, focal length, and working distance for machine vision lens selection.

Estimate the lens focal length needed for a required field of view, sensor size, and working distance.

Calculate object-side pixel size, pixels per millimeter, and feature pixel coverage for machine vision inspection.

Estimate industrial camera bandwidth from resolution, frame rate, bit depth, packing, camera count, and overhead.

Calculate maximum exposure time to limit motion blur based on object speed, field of view, and pixel resolution.

Estimate LED strobe duty cycle, peak power, average power, average current, and thermal margin for machine vision lighting.