Electrical load calculator

Estimate outputs: Current, Voltage drop. Adjust Power, Voltage, Cable length to match your project.

Inputs and units

Use the units shown beside each field. Replace the sample values with your measurements and the figures on the selected product packaging.

Parameter	Example input
Power	3,000 W
Voltage	230 V
Cable length	20 m
Cable section	2.5 mm²

Formula and assumptions

Current
Power / Voltage

Voltage drop
2 × Cable length × Current × 0.0175 / Cable section

ceil = round up; floor = round down; max = the greater value. Trigonometric angles are converted from degrees to radians.

Allowance is applied before rounding to whole packages. Whole units are rounded up; displayed decimals are rounded only for readability.

This is a preliminary geometry or quantity calculation, not a design check. Dimensions, spacing and performance requirements must come from your project.

Electrical calculation assumes copper at about 20 °C and a DC or single phase resistive circuit with power factor 1. It does not select cable size, protection or permitted current.

Worked example

Sample values are examples, not product specifications. Run the calculation again with your own measurements.

Result	Calculation
Current	13.0435 A
Voltage drop	3.6522 V

Related calculators

Related tools use separate measurements. Check their inputs before transferring quantities.