Electrical Wiring Calculators
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Voltage Drop Calculator

Designed to give the approximate loss factors in a circuit (AC or DC), including type of circuit, AWG or KCMIL, amperage, length of circuit and type of conductor, for wire. Enter the required data and click "Calculate". All results are estimates. In order to comply with national and local code, contact a qualified professional in your area.

Required Data
Select Material:
Select Size:
Select Voltage and Phase:
Enter 1/2 Total Circuit Length:
Feet
Enter Load:
Amps
   
 
Calculated Results
Estimated Drop:
Volts
Voltage At Circuit End:
Volts
Voltage Drop:
Percentage
Conductor:
CMA

Conduit Fill Calculator

Designed to give the approximate Minimum Raceway size based on a 40% maximum conduit fill. If Minimum Raceway reads "Exceeds Trade Size", the selected wiring and quanitiy has exceeded the 40% conduit fill of the largest conduit available, per the National Electrical Code®. Enter the required data (AWG or kcmil and Quantity) and click "Calculate". All results are estimates. In order to comply with national and local code, contact a qualified professional in your area.

Required Data
Conduit Type:
Wire Type:
AWG or kcmil:
 Quantity: Area:
AWG or kcmil:
 Quantity: Area:
AWG or kcmil:
 Quantity: Area:
AWG or kcmil:
 Quantity: Area:
Fill Percent (%):
 
 
Calculated Results
Minimum Raceway:

Wire Size and Amp Ratings

Wire Gauge Size

Copper

Aluminum

60°C
(140°F)

75°C
(167°F)

90°C
(194°F)

75°C
(167°F)

90°C
(194°F)

NM-B

THW

THWN-2

THW

XHHW-2

UF-B

THWN

THHN

THWN

THHN

 

SE

XHHW-2

SE

THWN-2

 

USE

 

USE

 
 

XHHW

 

XHHW

 

14

15

15

15

---

---

12

20

20

20

15

15

10

30

30

30

25

25

8

40

50

55

40

45

6

55

65

75

50

60

4

70

85

95

65

75

3

85

100

110

75

85

2

95

115

130

90

100

1

---

130

150

100

115

1/0

---

150

170

120

135

2/0

---

175

195

135

150

3/0

---

200

225

155

175

4/0

---

230

260

180

205

250

---

255

290

205

230

300

---

285

320

230

255

350

---

310

350

250

280

500

---

380

430

310

350

600

---

420

475

340

385

750

---

475

535

385

435

1000

---

545

615

445

500

WARNING! Installation of electrical wire can be hazardous, if done improperly, can result in personal injury or property damage.
For safe wiring practices, consult the National Electrical Code and your local building inspector.

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