GFCI and AFCI Placement Calculator
Determine which outlets and circuits require GFCI (Ground Fault Circuit Interrupter) and/or AFCI (Arc Fault Circuit Interrupter) protection based on NEC 2023 requirements.
Formulas & Logic
GFCI Outlets Required per Room:
GFCI_outlets = outlets_per_room × (1 if room is GFCI-required else 0)
Total GFCI Outlets:
Total_GFCI = Σ GFCI_outlets for all selected rooms
AFCI Breakers Required:
Total_AFCI = count of selected rooms where AFCI is required (1 breaker per room circuit)
Estimated Material Cost:
Cost_Low = (Total_GFCI × $15) + (Total_AFCI × $35) Cost_High = (Total_GFCI × $25) + (Total_AFCI × $55)
Assumptions & References
- NEC 210.8 — GFCI protection requirements for dwelling units (kitchens, bathrooms, garages, outdoors, basements, crawl spaces, laundry areas, boathouses).
- NEC 210.12 — AFCI protection requirements; expanded in NEC 2020 and 2023 to cover virtually all 120V, 15/20A branch circuits in dwelling units.
- NEC 680.22 — GFCI required for all receptacles within 20 ft of pool, spa, or hot tub water edge.
- NEC 553.4 — GFCI required for all receptacles in boathouses.
- One AFCI breaker is assumed per room type (single circuit); multi-circuit rooms may require additional breakers.
- GFCI outlet count is based on user-entered average outlets per room; actual count may vary.
- Dual-function AFCI/GFCI breakers can satisfy both requirements simultaneously where both apply.
- Cost estimates are for materials only; labor costs vary by region ($50–$100/hr electrician rate).
- Always consult your local Authority Having Jurisdiction (AHJ) — local amendments may supersede NEC defaults.
- This calculator is for estimation purposes only and does not replace a licensed electrician's assessment.