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Editable example valuesYour estimate
Live calculationNo location or tariff is detected automatically. All results use the values you enter.
What is this tool used for?
Use this tool for a preliminary DC cable voltage-drop check between equipment locations. It helps compare a proposed conductor size with an acceptable drop target.
How to use this calculator
Choose conductor material and enter operating voltage, current, one-way cable length, maximum drop percentage, conductor temperature and the proposed cable area. Enter the one-way length; the calculation already includes the return path.
Understanding your results
The required conductor area addresses voltage drop only. A cable meeting this result may still be unsuitable for current capacity, installation conditions or protection. Final selection requires those separate checks; this is not a three-phase AC calculator.
How this is calculated
Before you use the result
Voltage-drop sizing only: this does NOT check ampacity, insulation voltage, conduit fill, bundling, ambient derating, protective devices, connectors or local electrical rules. Final cable selection must satisfy those checks. Do not use this DC model for three-phase AC.
Is the suggested mm² safe for the current?
Not necessarily. It only meets the entered voltage-drop target. An installer must separately verify ampacity and installation requirements.