Plan Scale Converter
Convert measured length on drawings to real-world length. Select a preset or enter custom scale.
⚡ Electrical Pro Cheat Sheet & Field Tools
Plan scale, voltage drop, conduit fill, circuit load, device heights, fast BOM (wire & conduit), and notes — jobsite ready.
Voltage Drop Helper (Copper THHN)
Quick estimate. Uses DC resistance (ohms/1000 ft) @ 75°C. Round-trip length handled automatically.
Target ≤3% on branch circuits, ≤5% total (feeder + branch). Verify with NEC adjustment factors.
Conduit Fill Quick Check (EMT, 40% Limit)
Uses THHN approximate areas. Result shows % of the 40% max fill and max quantity at 40%.
Verify with NEC Ch. 9, Tbl. 1 & Tbl. 5/5A for exact construction and temperature ratings.
Circuit Load & Breaker Suggest
Add loads in VA. Continuous loads are multiplied by 125%. Suggestion uses the 80% rule.
| VA | Continuous | Adjusted VA | Remove |
|---|
Quick Device Heights (Typical — verify project specs)
| Device | AFF (to center) | Notes |
|---|---|---|
| Duplex Receptacles | 16″–18″ | ADA/owner may vary |
| Switches | 44″–48″ | Keep consistent |
| Kitchen Counter Recept. | 44″ | Verify backsplash height |
| GFCI in Bath | 42″ | Mirror clearance |
| TV/Data Outlets | 16″–54″ | Per AV drawings |
| Thermostat | 48″ | ADA clearances |
Fast BOM Builder — Wire & Conduit
Add runs to total conduit footage (by size/type) and wire footage (by AWG). Optionally include an equipment grounding conductor (EGC).
| System | Conduit | Size | Run (ft) | # CCC | Wire AWG | Wire Total (ft) | EGC | Remove |
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Field reference only — verify with NEC, AHJ, plans, and manufacturer data.