DIY

Electrical Wire Gauge Calculator (AWG)

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate the correct wire gauge for your electrical project based on amperage, distance, and voltage. NEC compliant.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

Choosing the Right Wire Size
Voltage Drop and Long Runs

Indian Standards

Lighting (6A): 1.0 sq mm। Power sockets (16A): 2.5 sq mm। AC (20-32A): 4-6 sq mm। Geyser: 4 sq mm। Main line: 6-10 sq mm। ISI mark MANDATORY। Havells, Polycab, Finolex: top brands। NEVER use non-ISI wires — fire hazard!।

Safety

MCB (miniature circuit breaker): mandatory in modern wiring। RCCB/ELCB: life-saving for shock protection (₹1,000-3,000)। Earthing: essential — many Indian homes have poor earthing।

⚡ CalcWolf Insight

Wire size calculator gets 25K monthly searches from DIYers and electricians. The search spikes during renovation season (spring-fall). Users are in active project mode and often explore related electrical and home improvement calculators.

Frequently asked questions

AC wire?▾

1.5 ton: 4 sq mm। 2 ton: 6 sq mm। Separate MCB for each AC।

Safety?▾

ISI mark mandatory। MCB + RCCB + proper earthing = safe home। Havells/Polycab/Finolex brands।

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →