Methodology and trust notes
Wire Math Methodology
This page documents formulas, constants, assumptions, and update policy used across Wire Math so
tool outputs stay auditable and consistent.
Core formulas
Calculation models
d(mm) = 0.127 × 92^((36 − AWG)/39) for AWG diameter.A(mm²) = π × (d/2)² for cross-sectional area.R(T) = R(20°C) × (1 + α × (T − 20)) for temperature-adjusted resistance.-
Vd = (2 × I × R per ft × L) / 1000 and Vd% = (Vd/Vsource) × 100 for
voltage-drop planning.
Scope limits
Assumptions you should keep visible
- Nominal conductor geometry and reference constants are used for estimates.
- Voltage-drop calculations assume a simple two-conductor loop model.
- Ampacity references use table assumptions documented on-page.
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Outputs support planning and screening, not stamped engineering design or local authority
approvals.
Data provenance
Reference handling policy
- Source edition labels are shown directly on relevant pages.
- Calculator logic is shared across pages to avoid drift.
- Material toggles are explicit where output changes by conductor type.
Update policy
How corrections are handled
- Reported issues are validated and corrected in shared data/calculation modules first.
- Any source or assumption changes are reflected in both copy and output context.
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Contact route for correction requests:
support@wiremath.com.