Electrical3 options compared

Wire Size Calculator

Calculates the appropriate electrical wire size needed based on the current load, voltage, and other factors to ensure safe and efficient power transmission. Helps users in home improvement, construction, and electronics by ensuring they choose the right cable type for their project, preventing potential hazards like overheating or insufficient current flow.

Electronics and circuits calculatorselectricalwire-gaugecircuit-sizingampacityvoltage-dropcode-compliant
Editors’ Top PickBased on community votes
Other OptionsRanked by votes
  1. Screenshot of OhmNexus
    02
    OhmNexus
    ohmnexus.com

    Calculates the correct electrical wire gauge (AWG) or millimeter size needed for any circuit based on load current, m...

    Open siteView details
  2. Screenshot of SmartCalc
    03
    SmartCalc
    smartcalc.top

    Free wire size calculator for estimating copper conductor area from voltage, current, cable length, and permitted vol...

    Open siteView details

Side by side

Wire Size Calculator options compared

ToolBest forStrengthsLimitations
Omni Calculator
omnicalculator.com
Versatile wire sizing
  • Covers DC, AC, 12V, and low-voltage lighting
  • Outputs wire diameter and cross-sectional area
  • No code or installation method options
OhmNexus
ohmnexus.com
Code-compliant wire sizing
  • Supports NEC/CEC, IEC, BS 7671, and AS/NZS standards
  • Lets you select installation method and insulation type
  • Fewer unit options compared to Omni
SmartCalc
smartcalc.top
Simple copper conductor estimates
  • Quick copper area estimate with voltage, current, length, and drop %
  • Includes FAQ that clarifies how the formula works
  • Assumes copper at 20°C only; not suitable for aluminum or diverse installations

Buyer's guide

How to choose a wire size calculator

When picking a wire size calculator, first identify what matters most for your project: if you need to follow a specific electrical code or account for how the wire will be installed (conduit, free air, etc.), choose a tool that lets you select those parameters. If you just need a fast, general-purpose estimate for common scenarios like garden ponds, sheds, or 12V systems, a versatile calculator that outputs both diameter and area will save you time without overcomplicating the input fields.

Questions

Wire Size Calculator FAQ

What wire gauge do I need for a 20-amp circuit?
1-3 sentence answer grounded in the material
Can I use this calculator for a 12V solar system?
1-3 sentence answer grounded in the material
How does voltage drop affect wire size selection?
1-3 sentence answer grounded in the material
Do I need to worry about ambient temperature when choosing wire size?
1-3 sentence answer grounded in the material
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