Cross-section
Calculate Cross-section instantly with the exact formula and a worked example. Free online calculator — no signup.
Cross-section
Current, A
Length, m
Allowed drop, %
U, V
Cross-section
3.0435mm²
S calculated
3,04 mm²
More about: Cross-section
What it calculates
The “Cross-section” calculator computes Cross-section in mm² from 4 parameters: current, a, length, m, allowed drop, %, u, v.
A standard physics formula used in educational and engineering tasks.
Example calculation
With parameters Current, A = 20, Length, m = 50, Allowed drop, % = 5, U, V = 230 the result is 3.04 mm² (S = 2·ρ·L·I / ΔU; ρ_Cu=0.0175).
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.