Connector calculators

Convert American Wire Gauge to conductor diameter and cross-sectional area, or back from mm² to AWG.

Estimate single-phase or three-phase cable voltage drop from length, current and conductor area.

Find the smallest AWG / mm² that keeps a run under a voltage-drop limit, from current, length and voltage.

Find the longest run a cable can cover before voltage drop breaks your limit (NEC 210.19).

Add up voltage drop across several cable segments in a run — harness and daisy-chain power.

Convert load power (kW or HP) to full-load line current for single-phase or three-phase circuits.

Compare resistance, weight and voltage drop for copper and aluminium cable — and find the aluminium size that matches copper.

Convert wire AWG to circular mils (CM), kcmil, diameter and mm² — the units US cable specs use.

Convert wire size across AWG, SWG, mm², diameter and kcmil — the full unit set in one place.

Correct copper or aluminium conductor resistance from 20 °C to any operating temperature (IEC 60028).

Derate cable ampacity for ambient temperature and conductor bundling (NEC 310.15).

Budget PoE power over cable length: PSE class, cable resistance, voltage drop and power available at the PD.

Turn contact resistance and current into I²R power loss, voltage drop and temperature rise.

Estimate the resistance and temperature rise of a crimp joint from wire gauge, current and joint quality.

Compute current skin depth in copper and aluminium at any frequency, from mains to RF.

Match wire AWG to crimp terminal and connector contact size, and pick tin or gold plating for the signal and mating-cycle count.

Convert connector pin pitch between mm, inches and mils — 0.100", 2.54 mm, 1.27 mm and more.

Estimate the mating-cycle life of a connector from plating type and contact construction.

Decode any IP rating (IP65, IP67, IP68…) — what each digit means, and what level you actually need.

Estimate the safe current for bundled wires in a harness from gauge, bundle size and ambient (NEC 310.15).

Plan wire cut lengths from routed path, routing factor and per-end allowance — with total length, feet and estimated cost.

Estimate the weight of a wire harness from gauge, length, copper and insulation.

Check conduit fill against the 40% NEC raceway limit from conduit interior diameter and cable sizes in mm or AWG.

Find minimum bend radius from cable OD and installation type, and size a drag chain.

Estimate edge-coupled differential impedance for USB, HDMI and Ethernet on microstrip or stripline (IPC-2141).

Estimate the differential impedance of a twisted pair from conductor gauge, spacing and dielectric.

Compute the characteristic impedance of a coax from inner/outer diameter and dielectric — or the dimensions for a target 50/75 Ω.

Convert PCB trace or cable length to signal delay — or find the length for a target delay — across microstrip, stripline, coax and twisted pair.

Estimate coaxial cable signal loss in dB from length and frequency, with datasheet loss or automatic estimate.

Estimate how well a cable shield blocks interference from transfer impedance, length and frequency.

Convert insulation resistance to leakage current and check the value against safe thresholds.

Solve V, I, R and P from any two known values — instantly.