1
Input set
5 fields
Load/current / Cable length
Electrical
Electrical Cable Size Estimator
Estimate cable size guidance from load, length, voltage and installation method. Use the inputs below to estimate materials, quantities, labour allowances, site checks or planning figures before creating quotes, RAMS, purchase lists or project records.
ElectricalSafety exposureEstimate only
Inputs
Result area
Estimated cable size guidance
6 mm2
Initial cable size prompt.
Estimated voltage drop
1.04 %
Approximate voltage drop percentage.
2
Outputs
2 results
Estimated cable size guidance / Estimated voltage drop
3
Estimate status
Ready
Initial cable size prompt.
4
Explore next
7
Electrical Voltage Drop Calculator
Formula notes
Estimate cable size guidance from load, length, voltage and installation method. The calculation uses the visible inputs, applies allowances where shown, and rounds ordering-style quantities up where practical.
Worked example
Example: enter the default values above, review the estimated cable size guidance, then adjust the allowance to suit supplier data and site conditions.
Move from estimate to record
Use Zektrx to turn planning figures into jobs, quotes, RAMS and purchase lists.
Copy a portable summary or print this page to PDF, then carry the checked figure into a controlled project workflow.
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Estimate approximate tray or trunking fill from cable diameters and containment size.
Related Zektrx workflows
FAQ
Common checks before using this result.
Is the electrical cable size estimator result final?
No. It is an estimating prompt only. Check measurements, supplier specifications, product data, site conditions and competent advice before ordering materials or starting work.
Can I save the result inside Zektrx?
Public calculator results are for lead-generation and planning today. App calculators can later save results to jobs, quotes, RAMS, stock and purchase orders.
Trade Estimate In Product
Show where the estimate goes after calculation.
Electrical Cable Size Estimator gives the starting number. Zektrx helps turn it into job planning, material control and report-ready evidence for the trade team.
1
Plan
Electrical
2
Materials
Estimated cable size guidance
3
Report
Electrical
Plan
Carry the estimate into the live job plan.
Trade estimates are more useful when they create a route into owners, dates, readiness checks and delivery context.
Trade calculator
Electrical
Materials
Connect quantities to stock and purchasing.
Calculator outputs can support material checks, reservations, purchase notes and job-linked stock evidence.
Trade calculator
Estimated cable size guidance
Report
Keep assumptions visible after the work starts.
Saved numbers and linked records help managers review estimates, evidence and close-out without rebuilding context.
Trade calculator
Electrical
Estimate To Site Control
Turn the number into a controlled next step.
Trade calculator results are more useful when they feed the work package: scope checks, material planning and the briefing that keeps delivery aligned.
Check the scope
Use the estimate to confirm measurements, assumptions, labour and site readiness.
Prepare materials
Move quantities into stock checks, purchase notes and job-linked material records.
Brief the work
Share the assumptions, limits and controls with the team before the job starts.