- No data uploaded
- Instant results
Wire Size for 150 Amps
A 150-amp load at 240 V over a 100 ft run needs 1/0 AWG copper (150 A rating · 3.66 V drop (1.5%)). Change the distance or voltage to re-size.
Wire Size for 150 Amps
Minimum wire size150 A rating · 3.66 V drop (1.5%)
| Size | Ampacity | Voltage drop |
|---|---|---|
| 14 AWG | 20 A | 92.1 V (38.4%) |
| 12 AWG | 25 A | 57.9 V (24.1%) |
| 10 AWG | 35 A | 36.3 V (15.1%) |
| 8 AWG | 50 A | 22.92 V (9.6%) |
| 6 AWG | 65 A | 14.73 V (6.1%) |
| 4 AWG | 85 A | 9.24 V (3.9%) |
| 3 AWG | 100 A | 7.35 V (3.1%) |
| 2 AWG | 115 A | 5.82 V (2.4%) |
| 1 AWG | 130 A | 4.62 V (1.9%) |
| 1/0 AWG | 150 A | 3.66 V (1.5%) |
| 2/0 AWG | 175 A | 2.9 V (1.2%) |
| 3/0 AWG | 200 A | 2.3 V (1%) |
| 4/0 AWG | 230 A | 1.82 V (0.8%) |
| 250 kcmil | 255 A | 1.54 V (0.6%) |
| 300 kcmil | 285 A | 1.29 V (0.5%) |
| 350 kcmil | 310 A | 1.1 V (0.5%) |
| 500 kcmil | 380 A | 0.77 V (0.3%) |
NEC Table 310.16 (75 °C column), 240.4(D) small-conductor limits and Chapter 9 Table 8 resistance. Apply continuous-load (125%), ambient temperature and bundling corrections, and follow your local code and AHJ.
Planning estimates only. Building codes, loads and material specs vary — have a licensed engineer or contractor confirm quantities and safety requirements. Disclaimer
Frequently asked questions
Is my data uploaded?
No. The calculation runs entirely in your browser — nothing you type is sent to a server.
Is it free?
Yes — free, unlimited and no sign-up.