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Wire Size Calculator
About
Current (Amps)
ⓘ
Wire Length (one-way)
ⓘ
feet
meters
Voltage
ⓘ
DC
AC (1-phase)
AC (3-phase)
V
Maximum Voltage Drop
ⓘ
%
Wire Material
ⓘ
Copper
Aluminum
Temperature Rating
ⓘ
60°C (140°F)
75°C (167°F)
90°C (194°F)
Installation Conditions
ⓘ
In Free Air
In Conduit
Underground
10°C (50°F)
30°C (86°F)
40°C (104°F)
50°C (122°F)
1-3 Conductors
4-6 Conductors
7-9 Conductors
10+ Conductors
Calculate
Results
Required Wire Size:
AWG (
mm²)
Actual Voltage Drop:
%
Maximum Current Capacity:
Amps
Derated Current Capacity:
Amps
Power Loss:
Watts
Resistance:
Ω
Warning:
About Wire Size Calculator
Features:
Calculates minimum wire size based on current capacity and voltage drop
Supports both AC and DC circuits
Includes temperature derating factors
Accounts for installation conditions
Provides results in both AWG and metric sizes
Important Notes:
All calculations follow NEC guidelines
Results are for estimation purposes only
Always consult local electrical codes
Professional review recommended for critical applications