PCB Design Calculators
13 free calculators with formulas and worked examples.
Trace width, controlled impedance, via sizing, differential pairs, crosstalk, decoupling, and PCB thermal calculators for high-speed and high-power board design.
Trace Width
Calculate minimum PCB trace width for current capacity per IPC-2221 and IPC-2152. Get resistance, voltage drop, and power dissipation. Free, instant results.
Trace Resistance
Calculate PCB copper trace DC resistance from width, length, thickness, and temperature. Get sheet resistance and temp coefficient. Free, instant results.
Differential Pair
Calculate Zdiff and Zcommon for edge-coupled microstrip pairs. Design USB, HDMI, and Ethernet differential pairs with odd/even mode impedance. Free, instant results.
Via Calculator
Calculate PCB via impedance, capacitance, inductance, and current capacity. Get aspect ratio and DFM warnings for through-hole and blind vias. Free, instant results.
Stackup Builder
Calculate trace width for target impedance across PCB stackup configurations. Select layer count, dielectric, and copper weight for 50 ohm or custom Z0. Free, instant results.
Controlled Z
Calculate characteristic impedance for surface microstrip, embedded microstrip, and stripline PCB traces. Get Z0, effective Er, and target trace width. Free, instant results.
PCB Crosstalk
Calculate PCB trace crosstalk NEXT, FEXT, and coupling coefficient for signal integrity analysis. Determine critical length and guard trace spacing. Free, instant results.
Decoupling Capacitor
Calculate decoupling capacitor SRF, impedance at target frequency, and number of caps needed for power integrity. Includes ESR/ESL modeling. Free, instant results.
PCB Trace Inductance
Calculate PCB trace parasitic inductance using the Ruehli formula. Get inductance per unit length and impedance at 100 MHz and 1 GHz. Free, instant results.
Via Thermal Resistance
Calculate thermal via resistance, array conductance, and current capacity for PCB thermal management. Design filled and plated via arrays. Free, instant results.
Power Plane Impedance
Calculate PCB power plane impedance, capacitance, inductance, and resonant frequency for PDN design. Optimize your power delivery network. Free, instant results.
Via Stub Resonance
Calculate via stub resonant frequency, signal notch depth, and backdrill benefit for high-speed PCB design. Optimize stub length. Free, instant results.
Solder Paste Volume
Calculate solder paste volume, stencil aperture area, and IPC-7525A area ratio. Design SMD stencils for reliable reflow soldering. Free, instant results.
About PCB Design Calculators
Printed circuit board design transforms schematic intent into manufacturable hardware, but high-speed and high-frequency signals impose constraints that go far beyond routing copper traces. At gigahertz frequencies or high slew rates, every trace is a transmission line, every via is an inductor, and every power plane gap is an antenna.
Controlled impedance is the first discipline: microstrip and stripline traces must be dimensioned to hit target impedances (typically 50 Ω single-ended, 100 Ω differential) within ±10%, otherwise signal reflections degrade eye diagrams and increase bit error rates. Trace width is determined by substrate thickness, dielectric constant, and copper weight — this calculator codifies the IPC-2141 and Hammerstad-Jensen equations that PCB fabricators use.
Current capacity is the second concern. IPC-2152 defines how wide a trace must be to carry a given current without exceeding a temperature rise budget. External traces dissipate heat more efficiently than internal ones, so the same 1 A requires a wider internal trace. Via sizing follows similar logic: a via with too small a barrel diameter becomes a thermal and electrical bottleneck.
Differential pairs require tight spacing control to maintain common-mode rejection. Decoupling capacitors must be placed within a few millimeters of IC power pins, with short low-inductance connections to the power plane. These calculators turn the IPC standards and electromagnetic field equations into immediately actionable numbers.