Electronics

Calculate kW, kVA, and kVAR for a balanced 3-phase load from voltage, current, and power factor.

Enter RA, RB, and C to compute frequency, period, duty cycle, and timing.

One-shot pulse width using T = 1.1 x R x C. Solve for T, R, or C with unit conversions and Show Work.

Calculate real power (W), apparent power (VA), reactive power (VAR), power factor, and phase angle for single-phase or three-phase AC circuits.

Calculate LSB size, levels, max code, and convert Voltage ↔ Code for an ideal ADC using any reference range.

Estimate noise reduction and effective resolution (ENOB gain) from averaging or oversampling + decimation.

Enter sampling rate and input frequency to compute the folded (aliased) frequency, Nyquist limit, and zone.

Enter a frequency to get wavelength and common antenna lengths (1/4, 1/2, 5/8, full). Add a shortening factor if needed.

Convert dBi ↔ dBd ↔ linear gain. Optional EIRP/ERP estimate using power + feedline loss.

Explore patterns with presets and controls. View a 2D polar plot and a 3D-style dome preview.

Peaking EQ (Biquad). Enter sample rate, center frequency, gain (dB), and Q to get normalized coefficients instantly.

Pick a wire gauge and settings to estimate a practical current capacity.

Enter cutoff frequencies or component values to compute center frequency, bandwidth, and Q.

Enter capacity + current to get C-rate and ideal runtime (or solve in reverse).

Estimate runtime from battery capacity + voltage + load (amps or watts). Includes efficiency, cutoff.

Estimate runtime from battery capacity and load. Supports mAh/Ah/Wh, efficiency losses, and optional Peukert effect.

Enter your battery specs and configuration to compute pack voltage, capacity (Ah), and energy (Wh).

Paste a value in any base. Convert instantly, see grouped bits, and toggle signed/unsigned fixed-width views.

Compute transistor heat quickly: P = VCE x IC. Optional thermal rise estimate.

Enter values to compute duty cycle (D), output voltage (Vout), or input voltage (Vin) using the ideal boost relationship.

Step-down (buck) converter math: duty cycle, inductor ripple, output ripple estimates, and peak currents.

Near-End Crosstalk (NEXT) estimate using a simple capacitive coupling model. Enter your line parameters to get coupled voltage and NEXT in dB.

Analyze RC charging and discharging with live results for capacitor voltage, current, charge, energy, and time constant.

Enter frequency and capacitance to calculate reactance instantly. Includes unit conversions.

Decode common capacitor markings (like 104, 473) into pF / nF / µF. Add tolerance/voltage markings if you have them.

Enter any two (or more) values to solve instantly. Includes waveform preview.

Enter frequency and length to estimate attenuation (dB), power delivered, and voltage ratio.

Peak and RMS to compute Crest Factor (Peak ÷ RMS). Includes dB conversion, visualization.

Convert a digital code to an ideal DAC output voltage (and back). Includes LSB size, full-scale range.

Convert between dB and ratios, and convert dBm/dBW to watts.

Convert RF/audio power levels between dBm and Watts instantly. Includes unit scaling.

Convert Vrms to dBV (ref: 1.000 Vrms) and back.

Calculate allowable power at a given ambient temperature using a standard derating curve (typically linear).

Estimate switching loss caused by diode reverse recovery using Qrr, trr, current, reverse voltage, and switching frequency.

Calculate DoD%, remaining %, discharged Ah/Wh.

Compute efficiency (%), losses (W), and output/input power using either Power mode or V×I mode.

Size a starter EMI filter (Common-Mode + Differential-Mode) from your noise band, impedance, and target attenuation. Includes cutoff estimates, damping guidance.

Size required airflow using Ventilation (ACH) or Heat Removal (BTU/hr). Live results, unit support.

Compute FFT frequency resolution: Δf = fs / N. Includes time window, Nyquist, bin mapping.

Compute Q from center frequency and bandwidth, or from damping ratio (ζ).

Estimate Flicker Index from min/max light output and a waveform assumption. Includes waveform preview.

Convert between frequency and period instantly. Supports common units.

Convert frequency to wavelength (and back) using λ = v / f and f = v / λ. Choose a speed preset (speed of light, typical coax, etc.) or enter a custom velocity.

Size a fuse from load current or power. Includes continuous-load margin, inrush allowance.

Enter a fundamental plus harmonic amplitudes to compute THD instantly. Includes spectrum view.

Size a heatsink by calculating required RθSA (heatsink-to-ambient) and estimate Tj (junction temperature).

Enter frequency and inductance to compute XL instantly. Includes unit conversions.

Enter inductance and current to compute stored energy. Includes unit conversions.

Estimate startup surge (peak) and steady current for common cases: capacitor charging (RC), motor/transformer, and resistive loads.

Compute ΔTj-c from power dissipation and RθJC. Optionally estimate junction temperature using case temperature.

Convert apparent power (kVA) and real power (kW) using Power Factor (PF).

L and C to compute resonance instantly. Includes unit conversions, reactance at resonance.

Estimate current draw + power for LED matrix panels (mono/RGB). Includes multiplex scan (1/N), brightness assumptions, PSU sizing headroom.

Calculate the correct series resistor and wattage for an LED string. Includes unit support, power dissipation.

Calculate load factor from demand or energy inputs. Ideal for utilities, generators, feeders, and capacity planning.

Toggle inputs (A–D), pick a gate, and see outputs instantly. Includes a truth table.

Estimate gate-drive power from Qg, Vdrive, and fsw. Outputs energy-per-cycle, average gate current, and total gate-drive power.

Estimate conduction loss using P = I² × R with RMS/DC current, duty cycle, temperature scaling, and parallel devices.

Estimate DC motor current from voltage, power, torque (Kt/Kv), and winding resistance. Includes stall estimate.

Estimate starting (inrush) current using nameplate data, supply voltage, and start method multipliers.

Enter line frequency and poles, then add either rotor RPM or slip to solve instantly. Includes synchronous speed, slip %, rotor speed, and optional slip frequency.

Compute NF (dB), Noise Factor (F), and Noise Temperature. Supports SNR-based solving and cascaded NF (Friis).

Enter a signal frequency and sample rate to check Nyquist compliance, estimate alias frequency, and compute a safer target sample rate.

Choose a configuration and enter resistor values to compute gain and output voltage instantly. Includes show-work steps and clean resistor-ratio math..

Estimate output offset from input offset voltage (Vos) and input bias current effects..

Estimate drift in ppm and Hz from temperature change, aging, supply variation, and load capacitance shifts.

Enter current, copper weight, and allowed temperature rise to get a recommended trace width for external or internal PCB layers.

Estimate battery runtime under real loads using Peukert exponent k. Great for lead-acid and other chemistries where capacity changes with discharge rate.

Enter any compatible set of values to solve power factor (PF), phase angle (φ), and P/Q/S. Includes single-phase and three-phase support.

Compute the capacitor size needed to move from your current power factor to a target power factor. Includes kVAR, estimated µF, current before/after.

Calculate RC time constant and delay to a voltage threshold for rising/falling step responses.

Enter any two timing values (Ton/Toff/Period/Frequency) to solve duty cycle and the missing timing.

Convert frequency ↔ period, compute on/off time from duty cycle, and estimate PWM frequency from timer settings.

Convert duty cycle + high/low levels into an equivalent average voltage (ideal low-pass average).

Enter ADC/DAC resolution and full-scale range to compute LSB step size, max quantization error, RMS quantization noise, and ideal quantization SNR.

Compute ideal LSB step size, RMS quantization noise, noise power, and ideal SNR for uniform quantizers (ADC/DAC).

Compute cutoff frequency (fc) and time constant (τ) for first-order RC low-pass or high-pass filters.

Enter R and C to compute cutoff frequency (fc), time constant (τ), and step-response timing estimates.

Calculate τ = R × C, and estimate charge/discharge time to a target percent.

Estimate rectified DC output from AC input: choose rectifier type, set diode drops, optional smoothing capacitor, and load.

Pick 4/5/6 bands to decode resistance, tolerance, and tempco.

Enter any two values to compute watts instantly. Add a resistor wattage rating to see headroom and risk.

Build series / parallel groups and get instant equivalent resistance.

Convert between Return Loss (dB), VSWR, reflection coefficient (|Γ|), mismatch %, and impedance-based reflection.

Estimate ripple for a capacitor-input filter using load current, capacitance, and ripple frequency (half-wave / full-wave). Includes “solve for C”.

Enter any one value (Vrms, Vpeak, or Vpp) to convert the others instantly. Sine wave only.

Compute switching thresholds VT+ and VT- (and hysteresis) from resistor ratios and output swing.

Convert bandwidth to rise time (and back) using standard scope response models. Great for checking whether a scope can faithfully capture fast edges.

Enter your timing numbers to compute setup/hold margins instantly.

Estimate short-circuit current using source voltage and total path resistance (source + wiring + connections).

Compute real power (W), apparent power (VA), reactive power (VAR), power factor, voltage, and current for single-phase AC or DC.

Estimate efficiency, losses, and heat. Use measured input/output power, or estimate from AC line values (PF-aware).

Compute Signal-to-Noise Ratio in dB and linear ratio from power or voltage.

Size panels from daily energy use + peak sun hours + losses. Optional battery autonomy estimate and panel count.

Convert acoustic pressure to dB SPL, invert back to pressure, sum multiple SPL values, and estimate distance loss.

Calculate stored energy and usable energy (Vmax→Vmin) for a single supercap or a series/parallel bank.

Compute SWR from forward/reflected power, return loss, or reflection coefficient.

Enter a fundamental amplitude and harmonic amplitudes to compute THD (%) and THD (dB). Optional THD+N supported.

Build a junction→ambient thermal chain, enter power + ambient, and estimate junction temperature.

Convert thermistor resistance ↔ temperature using the Beta model (fast) or optional Steinhart–Hart (3-point fit).

Enter power and voltage to compute line current (A). Includes power factor, efficiency.

Solve turns ratio, voltage ratio, current ratio, and impedance ratio for an ideal transformer.

Estimate energization inrush, source sag, and limiter effect. Use rated current + inrush multiplier (or VA + V).

Size a BJT base resistor for switching. Enter supply, VBE, load current, and a forced beta to get RB, IB, and power.

Calculate UART baud rate or divisor/BRR from your clock settings. Includes bit time, frame time, and percent error.

Estimate runtime from load and UPS/battery specs. Includes efficiency, reserve, and derating factors.

Enter frequency + velocity factor to compute wavelength in cable, plus quarter-wave and half-wave lengths.

Enter values to solve instantly. Includes unit conversions, divider visualization.

Compute voltage drop, percent drop, delivered voltage, and power loss for wire runs. Enter your system voltage, load current, distance, and wire size.

Enter three phase voltages to compute % unbalance using common industry definitions.

Enter any two values to solve the third instantly. Includes unit conversions.

Lookup AWG, convert diameter/area, estimate resistance per length, and size wire using current + run length + allowed voltage drop.

Compute efficiency from input/output power, primary/secondary V×I, or loss method.

Size the series resistor and verify currents and dissipation for a simple zener shunt regulator.