Calculators
Electrical calculators
80 tools
Amps, volts, watts, kVA, and power tools.
Browse by topic
Family pages are registry-driven. Calculator URLs stay /calc/electric/…
- Circuits Ohm's law, Kirchhoff, dividers, RC/RLC, and passive networks. · 15 tools
- Power & Energy Watts, VA, kVA, power factor, transformers, and energy use. · 23 tools
- Semiconductor Diode, MOSFET, LDO, and LED bias tools. · 9 tools
- Power Electronics Rectifiers, buck converters, ripple, and thermal paths. · 6 tools
- RF & Microwave RF link, transmission-line, impedance, matching, and microwave tools. · 13 tools
- PCB & Signal Integrity Trace, via, microstrip, stripline, and differential impedance. · 6 tools
- Analog & Data Conversion Op amp, ADC, and conversion-error tools. · 5 tools
- Signals / DSP Filters and signal calculations. · 4 tools
- Battery & Energy Storage Runtime, pack sizing, aging, and temperature derating. · 4 tools
Popular
Featured tools from the Family registry.
- Ohm's Law Calculator Enter any two of voltage, current, resistance, and power to solve the remaining values. Runs locally in your browser. Free online tool — no sign-up.
- Voltage Divider Calculator Solve a two-resistor voltage divider: enter exactly three of Vin, R1, R2, and Vout to find the fourth. Also reports current, power, ratio, and Rth. Try it free.
- Kirchhoff's Law Calculator Apply Kirchhoff’s voltage law to a series loop or current law to a parallel node with N resistors.
- RC Time Constant Calculator Calculate the RC time constant τ = R×C, solve for R or C, and get −3 dB frequency plus 2.2τ / 5τ timing estimates. Runs locally in your browser.
- Electric Power Calculator Calculate electrical power in watts from voltage and current for DC, single-phase AC, or balanced three-phase AC, from current and resistance, or from energy over time.
- Watts to Amps Calculator Convert watts to amps (and reverse) for DC, single-phase, and three-phase circuits. Power factor and voltage inputs included for AC loads. Try it free.
- Power Factor Calculator Calculate power factor from real power, voltage, and current for single-phase and three-phase (line-line or line-neutral) circuits. Try it free.
- Amps to VA Calculator Convert amps and volts to apparent power in VA or kVA for single-phase and three-phase circuits. Also convert VA back to amps. Fast and free.
Circuits
Ohm's law, Kirchhoff, dividers, RC/RLC, and passive networks.
- 555 Timer Calculator Astable frequency, period, high/low times and duty — or monostable pulse width — for the classic 555 timer from R and C. ln(2)-canonical NE555 timing with device-applicability warnings.
- Capacitance Calculator Compute parallel-plate capacitance C=εA/d or combine series/parallel capacitors. Runs locally in your browser.
- Current Divider Calculator Split a total current between two parallel resistors: I1 = It·R2/(R1+R2), I2 = It·R1/(R1+R2). Runs locally in your browser.
- High-Pass Filter Calculator First-order RC high-pass cutoff fc=1/(2πRC) and optional |H(f)|. Twin of the LPF calculator.
- Kirchhoff's Law Calculator Apply Kirchhoff’s voltage law to a series loop or current law to a parallel node with N resistors.
- LED Resistor Calculator Size the series resistor for one or more LEDs: R = (Vs − n·Vf) / If.
- Low-Pass Filter Calculator Design a first-order RC low-pass filter: solve any two of R, C, and cutoff fc = 1/(2πRC), and evaluate magnitude |H(f)| in linear and dB. Runs locally in your browser.
- Ohm's Law Calculator Enter any two of voltage, current, resistance, and power to solve the remaining values. Runs locally in your browser. Free online tool — no sign-up.
Power & Energy
Watts, VA, kVA, power factor, transformers, and energy use.
- Amps to kW Calculator Convert amps and volts to real power in kW for DC, AC single-phase, and balanced AC three-phase line-to-line. Runs locally in your browser. Free online tool — no sign-up.
- Amps to VA Calculator Convert amps and volts to apparent power in VA or kVA for single-phase and three-phase circuits. Also convert VA back to amps. Fast and free.
- Amps to Volts Calculator Solve voltage from current and resistance or power using Ohm’s law and P = V × I. Supports resistive DC and RMS AC estimates with clear formulas.
- Electric Power Calculator Calculate electrical power in watts from voltage and current for DC, single-phase AC, or balanced three-phase AC, from current and resistance, or from energy over time.
- Energy Consumption Calculator Estimate energy use in kWh from device watts and hours of operation. Useful for appliance and load planning. Runs locally in your browser. Try it free.
- Energy Cost Calculator Estimate electricity usage cost from watts/hours or kWh and your unit rate. Supports custom billing periods; standing charges and taxes are excluded. Runs locally in your browser.
- eV to Volts Calculator Relate electronvolt energy to electric potential difference through ΔE = qΔV. eV and volts measure different physical quantities. Runs locally in your browser.
- kVA to Amps Calculator Convert kVA and voltage to line current for single-phase and three-phase systems. Uses √3 for three-phase line-to-line volts. Runs locally in your browser.
Semiconductor
Diode, MOSFET, LDO, and LED bias tools.
- ADC Error Budget Calculator Combine ADC gain, offset, INL, and DNL errors (RSS or worst-case) into total LSB, volts, and %FS. Runs locally in your browser.
- Diode Equation Calculator Shockley diode law I_D=I_S·(e^(V_D/(n·V_T))−1). Solve current or voltage, including reverse branch I_D > −I_S. Runs locally in your browser.
- LDO Thermal Calculator Compute LDO dissipation P=(Vin−Vout)·Iout (+ Iq·Vin) and junction temperature. Runs locally in your browser.
- LED Resistor Calculator Size the series resistor for one or more LEDs: R = (Vs − n·Vf) / If.
- MOSFET Conduction Loss Calculator Calculate MOSFET conduction loss from I, Rds(on), current definition (DC / on-interval RMS / full-cycle RMS), and optional Rds(Tj) via linear α or datasheet ratio. Runs locally in your browser.
- MOSFET Junction Temperature Calculator Estimate MOSFET junction temperature from ambient, dissipation, and thermal resistance (effective RθJA, or case/heatsink-dominant RθJC+RθCA). Optional thermal margin.
- MOSFET Switching Loss Calculator First-order hard-switching overlap loss P_sw = ½·Vds·Id·(tr+tf)·f_sw, plus optional gate-drive power Qg·Vdrive·f. Not a full MOSFET loss stack. Runs locally in your browser.
- MOSFET Threshold & Overdrive Calculator Calculate MOSFET overdrive Vod=Vgs−Vth, square-law drain current, or model Vth. Vth here is the long-channel square-law parameter — not datasheet VGS(th). Runs locally in your browser.
Power Electronics
Rectifiers, buck converters, ripple, and thermal paths.
- AC to DC Rectifier Calculator Ideal half-wave/full-wave rectified waveform — peak, average and RMS voltage, with optional capacitor ripple estimation. Runs locally in your browser.
- Buck Converter Ripple Calculator Assumed-CCM buck peak-to-peak inductor ripple ΔI_L,pp = Vout(1−D)/(f L) and optional capacitor-only ΔV_C,pp ≈ ΔI/(8fC). Runs locally in your browser.
- Heatsink Thermal Resistance Calculator — θJC, θCS, θSA & Junction Temperature Size required heatsink θSA from Tj,max, or compute junction temperature from effective θJA or the θJC+θCS+θSA stack. Device dissipation only. Runs locally in your browser.
- MOSFET Switching Loss Calculator First-order hard-switching overlap loss P_sw = ½·Vds·Id·(tr+tf)·f_sw, plus optional gate-drive power Qg·Vdrive·f. Not a full MOSFET loss stack. Runs locally in your browser.
- MOSFET Total Loss Calculator MOSFET device dissipation from conduction + hard-switching + optional Coss/Eoss, plus optional gate-drive and Qrr commutation. Tj uses P_device, not associated total. Omitted terms are not treated as 0 W. Runs locally in your browser.
- Rectifier Ripple Capacitor Calculator Size filter capacitance or estimate ripple for half/full-wave rectifiers: Vripple ≈ I/(f·C). Runs locally in your browser.
RF & Microwave
RF link, transmission-line, impedance, matching, and microwave tools.
- Antenna Length Calculator Compute dipole (λ/2) or monopole (λ/4) antenna length from frequency and an empirical length factor. Runs locally in your browser.
- Cascaded Noise Figure Calculator Compute cascaded noise figure and total gain for a multi-stage RF chain using the Friis formula. Add, remove, or reorder stages. Runs locally in your browser.
- Coax Impedance Calculator Compute coaxial characteristic impedance Z0 from shield inner diameter D, center-conductor diameter d, and dielectric εr. Ideal TEM, μr≈1. Runs locally in your browser.
- dBm to Watts Calculator Convert dBm ↔ watts and dBm ↔ milliwatts with hard validation. Canonical Unit Engine for RF power.
- Free-Space Path Loss Calculator Compute free-space path loss FSPL = 20·log10(d·f) + 20·log10(4π/c) from distance and frequency, with optional antenna gains. Runs locally in your browser.
- L-section LC Match Calculator Narrowband real RL→Z0 L-section match with dual LP/HP solutions. Runs locally in your browser.
- Receiver Sensitivity Calculator Estimate MDS: S = −174 + NF + 10·log10(BW) + SNR_min (dBm). Runs locally in your browser.
- Reflection Coefficient to Impedance Calculator Convert complex Γ ↔ normalized z (Cartesian or polar Γ). Reports VSWR and return loss. Runs locally in your browser.
PCB & Signal Integrity
Trace, via, microstrip, stripline, and differential impedance.
- Microstrip Impedance Calculator Compute microstrip characteristic impedance Z0 from W/H/εr, or synthesize width for a target Z0 (zero-thickness IPC-2141 / Wadell–Hammerstad). Runs locally in your browser.
- PCB Differential Impedance Calculator Estimate edge-coupled microstrip differential impedance Zdiff from W, H, S, and εr. Hammerstad/Wadell Z0 plus IPC-2141A-style coupling. Runs locally in your browser.
- PCB Trace Thermal Calculator Estimate copper trace I²R power and temperature rise with a board thermal resistance. Runs locally in your browser.
- PCB Trace Width Calculator (IPC-2221) Size PCB copper traces from current and temperature rise using the classic IPC-2221 I = k·ΔT^0.44·A^0.725 relation for external and internal layers. Runs locally in your browser.
- Stripline Impedance Calculator Estimate symmetric stripline characteristic impedance from W, b, and εr. Extends microstrip / Zdiff. Runs locally in your browser.
- Via Current Capacity Calculator Estimate PCB via ampacity from drill diameter, plating thickness, and temperature rise using the IPC-2221 I = k·ΔT^0.44·A^0.725 relation on the plating cross-section.
Analog & Data Conversion
Op amp, ADC, and conversion-error tools.
- ADC Error Budget Calculator Combine ADC gain, offset, INL, and DNL errors (RSS or worst-case) into total LSB, volts, and %FS. Runs locally in your browser.
- ADC SNR / Quantization Calculator Ideal quantization SNR ≈ 6.02·N + 1.76 dB for a full-scale sine; reverse measured SINAD to ENOB. Runs locally in your browser.
- Op-amp Error Budget Calculator Estimate DC output-referred error from Vos, Ib, Ios and feedback resistors (RSS or worst-case).
- Op-Amp Gain Calculator Closed-loop gain for non-inverting (1+Rf/Rg) and inverting (−Rf/Rg) op-amp circuits. Runs locally in your browser.
- Op-amp Noise Calculator Estimate flat-band output noise from en, optional in, gain, and bandwidth. Runs locally in your browser.
Signals / DSP
Filters and signal calculations.
- ADC SNR / Quantization Calculator Ideal quantization SNR ≈ 6.02·N + 1.76 dB for a full-scale sine; reverse measured SINAD to ENOB. Runs locally in your browser.
- High-Pass Filter Calculator First-order RC high-pass cutoff fc=1/(2πRC) and optional |H(f)|. Twin of the LPF calculator.
- Logic Gate Calculator Evaluate basic digital logic gates from binary inputs. Runs locally in your browser.
- Low-Pass Filter Calculator Design a first-order RC low-pass filter: solve any two of R, C, and cutoff fc = 1/(2πRC), and evaluate magnitude |H(f)| in linear and dB. Runs locally in your browser.
Battery & Energy Storage
Runtime, pack sizing, aging, and temperature derating.
- Battery Pack Sizing Calculator Size battery capacity (Ah) from load and runtime targets, with optional series/parallel cell geometry. Inverse of Battery Runtime (watts load-side / amps battery-side).
- Battery Runtime Calculator Estimate battery runtime from capacity (Ah or mAh), voltage, and constant load in watts (load-side) or amps (battery-side), with planning DoD and load-side efficiency. Runs locally in your browser.
- Battery Runtime with Temperature Estimate constant-load battery runtime with a generic cold-derating heuristic about 25 °C. Extends Battery Runtime (watts load-side / amps battery-side). Planning model — not chemistry.
- Linear Battery Aging Calculator Estimate battery capacity with a simple linear cycle + calendar aging model: SOH = max(0, 1 − k_cycle·N − k_cal·t), C = C0·SOH. Default coefficients are illustrative. Runs locally in your browser.
More electrical calculators
Not yet placed in a published Family.
- Electricity Bill Calculator Estimate an electricity bill from kWh usage or meter readings, with rate, standing charge, and days of service. Runs locally in your browser.
- mAh to Wh Calculator Convert battery capacity from mAh to Wh (and reverse) using nominal voltage—common for USB power banks and Li-ion packs. Runs locally in your browser.
- Wavelength Calculator Compute λ = c·VF/f in vacuum or dielectric. Solve for wavelength or frequency. Runs locally in your browser.
All Electrical calculators
Full list for search and crawl.
- 555 Timer Calculator Astable frequency, period, high/low times and duty — or monostable pulse width — for the classic 555 timer from R and C. ln(2)-canonical NE555 timing with device-applicability warnings.
- AC to DC Rectifier Calculator Ideal half-wave/full-wave rectified waveform — peak, average and RMS voltage, with optional capacitor ripple estimation. Runs locally in your browser.
- ADC Error Budget Calculator Combine ADC gain, offset, INL, and DNL errors (RSS or worst-case) into total LSB, volts, and %FS. Runs locally in your browser.
- ADC SNR / Quantization Calculator Ideal quantization SNR ≈ 6.02·N + 1.76 dB for a full-scale sine; reverse measured SINAD to ENOB. Runs locally in your browser.
- Amps to kW Calculator Convert amps and volts to real power in kW for DC, AC single-phase, and balanced AC three-phase line-to-line. Runs locally in your browser. Free online tool — no sign-up.
- Amps to VA Calculator Convert amps and volts to apparent power in VA or kVA for single-phase and three-phase circuits. Also convert VA back to amps. Fast and free.
- Amps to Volts Calculator Solve voltage from current and resistance or power using Ohm’s law and P = V × I. Supports resistive DC and RMS AC estimates with clear formulas.
- Antenna Length Calculator Compute dipole (λ/2) or monopole (λ/4) antenna length from frequency and an empirical length factor. Runs locally in your browser.
- Battery Pack Sizing Calculator Size battery capacity (Ah) from load and runtime targets, with optional series/parallel cell geometry. Inverse of Battery Runtime (watts load-side / amps battery-side).
- Battery Runtime Calculator Estimate battery runtime from capacity (Ah or mAh), voltage, and constant load in watts (load-side) or amps (battery-side), with planning DoD and load-side efficiency. Runs locally in your browser.
- Battery Runtime with Temperature Estimate constant-load battery runtime with a generic cold-derating heuristic about 25 °C. Extends Battery Runtime (watts load-side / amps battery-side). Planning model — not chemistry.
- Buck Converter Ripple Calculator Assumed-CCM buck peak-to-peak inductor ripple ΔI_L,pp = Vout(1−D)/(f L) and optional capacitor-only ΔV_C,pp ≈ ΔI/(8fC). Runs locally in your browser.
- Capacitance Calculator Compute parallel-plate capacitance C=εA/d or combine series/parallel capacitors. Runs locally in your browser.
- Cascaded Noise Figure Calculator Compute cascaded noise figure and total gain for a multi-stage RF chain using the Friis formula. Add, remove, or reorder stages. Runs locally in your browser.
- Coax Impedance Calculator Compute coaxial characteristic impedance Z0 from shield inner diameter D, center-conductor diameter d, and dielectric εr. Ideal TEM, μr≈1. Runs locally in your browser.
- Current Divider Calculator Split a total current between two parallel resistors: I1 = It·R2/(R1+R2), I2 = It·R1/(R1+R2). Runs locally in your browser.
- dBm to Watts Calculator Convert dBm ↔ watts and dBm ↔ milliwatts with hard validation. Canonical Unit Engine for RF power.
- Diode Equation Calculator Shockley diode law I_D=I_S·(e^(V_D/(n·V_T))−1). Solve current or voltage, including reverse branch I_D > −I_S. Runs locally in your browser.
- Electric Power Calculator Calculate electrical power in watts from voltage and current for DC, single-phase AC, or balanced three-phase AC, from current and resistance, or from energy over time.
- Electricity Bill Calculator Estimate an electricity bill from kWh usage or meter readings, with rate, standing charge, and days of service. Runs locally in your browser.
- Energy Consumption Calculator Estimate energy use in kWh from device watts and hours of operation. Useful for appliance and load planning. Runs locally in your browser. Try it free.
- Energy Cost Calculator Estimate electricity usage cost from watts/hours or kWh and your unit rate. Supports custom billing periods; standing charges and taxes are excluded. Runs locally in your browser.
- eV to Volts Calculator Relate electronvolt energy to electric potential difference through ΔE = qΔV. eV and volts measure different physical quantities. Runs locally in your browser.
- Free-Space Path Loss Calculator Compute free-space path loss FSPL = 20·log10(d·f) + 20·log10(4π/c) from distance and frequency, with optional antenna gains. Runs locally in your browser.
- Heatsink Thermal Resistance Calculator — θJC, θCS, θSA & Junction Temperature Size required heatsink θSA from Tj,max, or compute junction temperature from effective θJA or the θJC+θCS+θSA stack. Device dissipation only. Runs locally in your browser.
- High-Pass Filter Calculator First-order RC high-pass cutoff fc=1/(2πRC) and optional |H(f)|. Twin of the LPF calculator.
- Kirchhoff's Law Calculator Apply Kirchhoff’s voltage law to a series loop or current law to a parallel node with N resistors.
- kVA to Amps Calculator Convert kVA and voltage to line current for single-phase and three-phase systems. Uses √3 for three-phase line-to-line volts. Runs locally in your browser.
- kVA to kW Calculator Convert apparent power (kVA) to real power (kW) with power factor. States when PF is required and when loads are assumed balanced. Try it free.
- kW to VA Calculator Convert kilowatts to volt-amperes using power factor. Distinguishes real vs apparent power for feeder and transformer sizing. Runs locally in your browser.
- kWh to kW Calculator Convert kilowatt-hours and duration into average kilowatts. Clarifies energy vs power for metering and solar sizing. Runs locally in your browser.
- kWh to Watts Calculator Convert energy in kWh and a time period into average power in watts (and reverse) for load and generation estimates. Runs locally in your browser.
- L-section LC Match Calculator Narrowband real RL→Z0 L-section match with dual LP/HP solutions. Runs locally in your browser.
- LDO Thermal Calculator Compute LDO dissipation P=(Vin−Vout)·Iout (+ Iq·Vin) and junction temperature. Runs locally in your browser.
- LED Resistor Calculator Size the series resistor for one or more LEDs: R = (Vs − n·Vf) / If.
- Linear Battery Aging Calculator Estimate battery capacity with a simple linear cycle + calendar aging model: SOH = max(0, 1 − k_cycle·N − k_cal·t), C = C0·SOH. Default coefficients are illustrative. Runs locally in your browser.
- Logic Gate Calculator Evaluate basic digital logic gates from binary inputs. Runs locally in your browser.
- Low-Pass Filter Calculator Design a first-order RC low-pass filter: solve any two of R, C, and cutoff fc = 1/(2πRC), and evaluate magnitude |H(f)| in linear and dB. Runs locally in your browser.
- mAh to Wh Calculator Convert battery capacity from mAh to Wh (and reverse) using nominal voltage—common for USB power banks and Li-ion packs. Runs locally in your browser.
- Microstrip Impedance Calculator Compute microstrip characteristic impedance Z0 from W/H/εr, or synthesize width for a target Z0 (zero-thickness IPC-2141 / Wadell–Hammerstad). Runs locally in your browser.
- MOSFET Conduction Loss Calculator Calculate MOSFET conduction loss from I, Rds(on), current definition (DC / on-interval RMS / full-cycle RMS), and optional Rds(Tj) via linear α or datasheet ratio. Runs locally in your browser.
- MOSFET Junction Temperature Calculator Estimate MOSFET junction temperature from ambient, dissipation, and thermal resistance (effective RθJA, or case/heatsink-dominant RθJC+RθCA). Optional thermal margin.
- MOSFET Switching Loss Calculator First-order hard-switching overlap loss P_sw = ½·Vds·Id·(tr+tf)·f_sw, plus optional gate-drive power Qg·Vdrive·f. Not a full MOSFET loss stack. Runs locally in your browser.
- MOSFET Threshold & Overdrive Calculator Calculate MOSFET overdrive Vod=Vgs−Vth, square-law drain current, or model Vth. Vth here is the long-channel square-law parameter — not datasheet VGS(th). Runs locally in your browser.
- MOSFET Total Loss Calculator MOSFET device dissipation from conduction + hard-switching + optional Coss/Eoss, plus optional gate-drive and Qrr commutation. Tj uses P_device, not associated total. Omitted terms are not treated as 0 W. Runs locally in your browser.
- Ohm's Law Calculator Enter any two of voltage, current, resistance, and power to solve the remaining values. Runs locally in your browser. Free online tool — no sign-up.
- Op-amp Error Budget Calculator Estimate DC output-referred error from Vos, Ib, Ios and feedback resistors (RSS or worst-case).
- Op-Amp Gain Calculator Closed-loop gain for non-inverting (1+Rf/Rg) and inverting (−Rf/Rg) op-amp circuits. Runs locally in your browser.
- Op-amp Noise Calculator Estimate flat-band output noise from en, optional in, gain, and bandwidth. Runs locally in your browser.
- Parallel Resistor Calculator Compute equivalent resistance of two or more resistors in parallel. Runs locally in your browser.
- PCB Differential Impedance Calculator Estimate edge-coupled microstrip differential impedance Zdiff from W, H, S, and εr. Hammerstad/Wadell Z0 plus IPC-2141A-style coupling. Runs locally in your browser.
- PCB Trace Thermal Calculator Estimate copper trace I²R power and temperature rise with a board thermal resistance. Runs locally in your browser.
- PCB Trace Width Calculator (IPC-2221) Size PCB copper traces from current and temperature rise using the classic IPC-2221 I = k·ΔT^0.44·A^0.725 relation for external and internal layers. Runs locally in your browser.
- Power Factor Calculator Calculate power factor from real power, voltage, and current for single-phase and three-phase (line-line or line-neutral) circuits. Try it free.
- RC Time Constant Calculator Calculate the RC time constant τ = R×C, solve for R or C, and get −3 dB frequency plus 2.2τ / 5τ timing estimates. Runs locally in your browser.
- Receiver Sensitivity Calculator Estimate MDS: S = −174 + NF + 10·log10(BW) + SNR_min (dBm). Runs locally in your browser.
- Rectifier Ripple Capacitor Calculator Size filter capacitance or estimate ripple for half/full-wave rectifiers: Vripple ≈ I/(f·C). Runs locally in your browser.
- Reflection Coefficient to Impedance Calculator Convert complex Γ ↔ normalized z (Cartesian or polar Γ). Reports VSWR and return loss. Runs locally in your browser.
- Resistor Color Code Calculator IEC 60062 band colors → Ω ±tol. Runs locally in your browser.
- RF Link Budget Calculator Compute RF link budget: FSPL, path loss with antenna gains and misc loss, received power, and optional margin above sensitivity. Extends Free-Space Path Loss.
- RLC Resonance Calculator Calculate RLC resonant frequency f₀, Q factor, bandwidth, and reactance at resonance for series or parallel circuits from L, C, and R. Runs locally in your browser.
- Series Capacitor Calculator Combine capacitors in series: 1/C = Σ 1/Ci. Runs locally in your browser.
- Skin Depth Calculator Compute electromagnetic skin depth δ = √(ρ/(π·f·μ)) for conductors. Runs locally in your browser.
- Smith Chart Calculator Interactive impedance Smith chart with auto-match, drag-to-tune, L·C·R / T-line / stub / transformer / ‖RLC, Custom Z(f), f-locus, and Touchstone S11/S21 with stability overlays. Runs locally in your browser.
- Stripline Impedance Calculator Estimate symmetric stripline characteristic impedance from W, b, and εr. Extends microstrip / Zdiff. Runs locally in your browser.
- Transformer Sizing Calculator Ideal transformer: Vp/Vs=Np/Ns, currents, and VA = V·I. First-pass sizing. Runs locally in your browser.
- VA to kVA Calculator Convert volt-amperes (VA) to kilovolt-amperes (kVA) with the exact 1000× scale factor used on nameplates. Runs locally in your browser. Try it free.
- Via Current Capacity Calculator Estimate PCB via ampacity from drill diameter, plating thickness, and temperature rise using the IPC-2221 I = k·ΔT^0.44·A^0.725 relation on the plating cross-section.
- Voltage Divider Calculator Solve a two-resistor voltage divider: enter exactly three of Vin, R1, R2, and Vout to find the fourth. Also reports current, power, ratio, and Rth. Try it free.
- Volts to Joules Calculator Relate voltage, charge, or capacitance to energy in joules for electrostatic and capacitor examples. Runs locally in your browser. Try it free.
- Volts to kW Calculator Estimate kilowatts from voltage, current, and power factor for single-phase and three-phase circuits. Runs locally in your browser. Try it free.
- VSWR Calculator Convert between reflection coefficient |Γ|, VSWR, and return loss. Runs locally in your browser.
- Watts to Amps Calculator Convert watts to amps (and reverse) for DC, single-phase, and three-phase circuits. Power factor and voltage inputs included for AC loads. Try it free.
- Watts to Joules Calculator Convert watts and time to energy in joules (and reverse). Shows W × s = J with worked timing examples. Runs locally in your browser. Try it free.
- Watts to kVA Calculator Convert watts to kVA with power factor. Helps size generators and UPS equipment from real power demand. Runs locally in your browser. Try it free.
- Watts to VA Calculator Convert real power in watts to apparent power in VA using power factor. Clarifies W vs VA for sizing breakers and transformers. Try it free.
- Watts to Volts Calculator Find voltage from power and current (or resistance). Useful for DC and resistive AC checks with unit guidance. Runs locally in your browser.
- Watts Volts Amps Calculator Solve any two of watts, volts, amps, and ohms for the other values—an Ohm’s-law style watt–volt–amp workspace. Runs locally in your browser.
- Wavelength Calculator Compute λ = c·VF/f in vacuum or dielectric. Solve for wavelength or frequency. Runs locally in your browser.
- Wheatstone Bridge Calculator Compute Wheatstone bridge output voltage and balance from Vin and four resistors. Runs locally in your browser.