Voltage Drop & Cable Power Loss Calculator

Estimate voltage drop, delivered voltage, conductor resistance, power loss and energy cost from transparent electrical assumptions.

Free engineering reference tool

Circuit

Cable length is one-way. The required electrical path multiplier is calculated internally for the selected circuit.

Circuit typeSupply voltage(V)Load current(A)One-way cable length(m)Length unitParallel conductors per phasePower factorOperating hours per day(h)Operating days per year(days)Electricity price(/ kWh)CurrencyUser reference drop(% optional)

Reference limits vary by system, installation, design objective and applicable rules. The entered limit is a comparison aid only.

Conductor

MaterialCable cross-sectional area(mm2)

Local copper reference: 1.724e-8 ohm m at 20 C.

Advanced conductor assumptions

Estimate temperature-adjusted resistance

Calculation mode

Active method

Uses local bulk-material resistivity and cable geometry. AC reactance is ignored in this simplified estimate.

Comparison

Defaults include one size below, selected size, one size above and the next larger size. Add up to four custom areas, for a maximum of six rows.

1.5 mm22.5 mm2 selected4 mm26 mm2

Examples

Load a hand-checked example

All calculations and report generation run locally in your browser. Values are not sent to MicroIntent, stored or shared.

Voltage-drop estimate

Enter circuit and conductor assumptions, then calculate a local engineering estimate. Results include the electrical path, delivered voltage, conductor loss, energy cost and cable-area comparison.

Voltage drop: Awaiting inputs
Delivered voltage: Awaiting inputs
Cable power loss: Awaiting inputs
Annual energy loss: Awaiting inputs

Cable path

SupplySupply

Cable runOne-way length · Area · CurrentLost

LoadLoad

Voltage proportion