Resistivity Calculator

Calculate resistivity, resistance, length, or cross-sectional area using R = ρL/A. Compute resistivity (ρ = R·A/L), resistance (R = ρ·L/A), length (L = R·A/ρ), or area (A = ρ·L/R). Features material database with 14 substances (Silver, Copper, Gold, Aluminum, Tungsten, Iron, Platinum, Tin, Lead, Nichrome, Carbon, Silicon, Glass, Rubber) with resistivity values at 20°C. Supports units: resistance (Ω, kΩ, MΩ), length (m, cm, mm, km, ft, in), area (m², cm², mm², ft², in², circular mil), and resistivity (Ω·m, Ω·cm, Ω·mm²/m, µΩ·cm). Includes material identification and conductivity calculation. Ideal for electrical engineering, wire sizing, and material science applications.