DC cable size calculator
Use our dc cable size calculator to calculate accurate size and measurement values instantly.
Calculator
Estimate cable cross-sectional area from load current and run length.
Formula: Use Vdrop = I x R with R = rho x (2L) / A, solve A for allowable drop.
What each field means
- Load Current (A): Enter a valid value for this field.
- Cable Length (m): Enter a valid value for this field.
- System Voltage (V): Enter a valid value for this field.
- Allowed Voltage Drop (%): Example: 3
- Conductor Material: Enter a valid value for this field.
Recommended Cable Size (mm2)
Your result will appear here.
About DC cable size calculator
The DC cable size calculator helps you estimate cable and electrical values quickly using consistent assumptions and practical calculation rules.
Formula Explanation
Use Vdrop = I x R with R = rho x (2L) / A, solve A for allowable drop.
Inputs You Need
- Required measurement values relevant to this calculator
- Unit selection: Load Current (A), Cable Length (m), System Voltage (V), Allowed Voltage Drop (%)
- Optional tolerance, safety, or scenario values if applicable
Step-by-Step Usage
- Enter your known values in the calculator fields.
- Select units and options that match your scenario.
- Click Calculate to generate your output.
- Copy, save, or share the result for later reference.
Example
Run the tool with realistic values from your use case and compare the output against expected ranges for cable and electrical calculations.
Method Sources
Frequently Asked Questions
Is this DC cable size calculator accurate?
Yes, when correct inputs and units are provided.
Which units does this calculator support?
This tool is optimized for Load Current (A), Cable Length (m), System Voltage (V), Allowed Voltage Drop (%).
Can I use this calculator on mobile?
Yes, the form is optimized for touch inputs and smaller screens.