What is this calculator?
Estimate DC voltage drop using a conductor resistance you enter.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Estimate DC voltage drop using a conductor resistance you enter.
How to use it
- Enter current (a).
- Enter one-way wire length (m).
- Enter resistance per metre (ω/m).
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
The formula uses the units and definitions shown above. Each input is substituted before the arithmetic is evaluated; the calculated output is rounded for display.
Worked example
Current (A): 10, One-way wire length (m): 20, Resistance per metre (Ω/m): 0.005. The result is 2 V (result).
Assumptions and limits
Two-wire DC approximation. Not an AC circuit or electrical code compliance check.
Frequently asked questions
What inputs does the Voltage Drop Calculator need?
Use current (a), one-way wire length (m), resistance per metre (ω/m). Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Voltage Drop Calculator?
Two-wire DC approximation. Not an AC circuit or electrical code compliance check.