## voltage drop calculator

Please select current type from drop-down list and Input the Resistivity,wire diameter size,wire length,select current type from drop-down list ,input the current and volts(V) and click the calculate button for the result.

In this Post We will Cover following topics 3 phase voltage drop calculation example,3 phase voltage drop calculation formula,how to compute voltage drop of 3 phase power cable,3 phase voltage drop calculator.

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**Online Voltage drop calculations**

How to calculate Voltage drop in DC / single phase calculation**Vdrop (V) = Iwire (A) × Rwire(Ω)**

**= Iwire (A) × (2 × L(ft) × Rwire(Ω/kft) / 1000(ft/kft))**

Iwire (A)=wire current I in amps (A)

L(ft)= wire length L in feet (ft)

Rwire(Ω)=R in ohms (Ω/kft)

**How to calculate Voltage drop 3 phase(If wire length in meters)**

**Vdrop (V) = Iwire (A) × Rwire(Ω)**

**= Iwire (A) × (2 × L(m) × Rwire (Ω/km) / 1000(m/km))**

Iwire (A)=wire current I in amps (A)

L(m)= wire length L in meters (m)

Rwire(Ω)= R in ohms (Ω/km)

**How to calculate Voltage drop 3 phase(wire length L in feet (ft))**

**Vdrop (V) = √3 × Iwire (A) × Rwire (Ω)**

**= 1.732 × Iwire (A) × (L(ft) × Rwire (Ω/kft) / 1000(ft/kft))**

Iwire (A)=wire current I in amps (A)

L(ft)= wire length L in feet (ft)

Rwire(Ω)=R in ohms (Ω/kft)

**How to calculate Voltage drop 3 phase(wire length L in meters(m))**

**Vdrop (V) = √3 × Iwire (A) × Rwire (Ω)**

**= 1.732 × Iwire (A) × (L(m) × Rwire (Ω/km) / 1000(m/km))**

Iwire (A)=wire current I in amps (A)

L(m)= wire length L in meters (m)

Rwire(Ω)= R in ohms (Ω/km)

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**How To calculate Wire diameter (if gauge wire diameter dm in inches)**

If gauge wire diameter dm in inches

*d**k*_{(in)}= 0.005 in × 92^{(36-k)/39}###
**How To calculate Wire diameter (if gauge wire diameter dm in millimeters)**

*d**k*_{(mm)}= 0.005 mm × 92^{(36-k)/39}###
**How to calculate Wire cross sectional area (in kcmil)**

*A**k*_{ (kcmil)}= 1000×*dk*^{2}= 0.025 in^{2}× 92^{(36-k)/19.5}
An=cross sectional area in kilo-circular mils

dn=wire diameter d in inches###
**How to calculate Wire cross sectional area (in inches) **

*A**k*_{ (in}2_{)}= (π/4)×*dk*^{2}= 0.000019635 in^{2}× 92^{(36-k)/19.5}
An=cross sectional area in inches

dn=wire diameter d in inches###
**How to calculate Wire cross sectional area (in millimeters)**

*A*_{k}_{(mm}2_{)}= (π/4)×*dk*^{2}= 0.012668 mm^{2}× 92^{(36-k)/19.5}

An=cross sectional area in millimeters

dn=wire diameter d in millimeters###
**How to calculate Wire resistance (per kilofeet)**

*Rk*_{ (Ω/kft)}= 0.3048 × 10^{9}×*ρ*_{(Ω·m)}/ (25.4^{2}×*A*_{k}_{ (in}2_{)})
R=resistance in ohms per kilofeet (Ω/kft)

ρ =wire's resistivity in ohm-meters (Ω·m)An=cross sectional area An in square millimeters (mm2)

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**How to calculate Wire resistance (per kilometer)**

*R*_{k (Ω/km)}= 10^{9}×*ρ*_{(Ω·m)}/*A*_{k}_{ (mm}2_{)}ρ =wire's resistivity in ohm-meters (Ω·m)

Ak=cross sectional area An in square millimeters (mm2)

Lets take example

I have three resistors R1,R2 and R3,All resistors connected in series with 10 volt battery

Lets take R1 =10 ohms, R2 = 20 ohms,R2 = 30 ohms.

So that sum of resistance in the circuit is R1+R2+r3 = 10+20+30= 60 ohms.

apply ohm’s law so that we can compute the current flow from the 10 battery across All resistors (R1,R2 and R3).

All resistors are connected in series so that the current flow across All resistors

wil be the same. According to

Ohm’s law Voltage= (I)*(R)

**V= IR => I=V/R**

I= 10V/60 Ohms= 0.17 amps so that the current flowing across All resistors is 0.17 amps.

Now we know that current flow across All is 0.17 amps so that we can caculate voltage drop

through each resistor using ohm’s law.

Voltage drop through R1 is V= (0.17 amps)x(10 ohms) = 1.7volts

Voltage drop through R2 is V=(0.17 amps)x(20 oms) = 3.4 volts

Voltage drop through R3 is V=(0.17 amps)x(30 oms) = 5.1 volts

The total voltage is equal to battery voltage = voltage drop through R1+voltage drop through R2+voltage drop through R3

total voltage = 1.7V+3.4V+5.1V= 5V.

All wires with long length can be serve as resistors in the circuit and So that you can calculate voltage drop through as above. Producer of the wire generally specs the wire as resistance per for feet or per meters.complete resistance of the cable can be computed based on the length of the cable.if your cable or wire length is less them 50 ft then you don't have to worry about the resistance

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**AWG wire Chart**

AWG | wire diameter dn | Turns of wire | Area Unit | Copper resistance Unit | ||||

inch | mm | per inch | per cm | kcmil | mm^{2} |
O/km | O/kFT | |

0000 (4/0) | 0.4600 | 11.684 | 2.17 | 0.856 | 212 | 107 | 0.1608 | 0.04901 |

000 (3/0) | 0.4096 | 10.404 | 2.44 | 0.961 | 168 | 85.0 | 0.2028 | 0.06180 |

00 (2/0) | 0.3648 | 9.266 | 2.74 | 1.08 | 133 | 67.4 | 0.2557 | 0.07793 |

0 (1/0) | 0.3249 | 8.252 | 3.08 | 1.21 | 106 | 53.5 | 0.3224 | 0.09827 |

1 | 0.2893 | 7.348 | 3.46 | 1.36 | 83.7 | 42.4 | 0.4066 | 0.1239 |

2 | 0.2576 | 6.544 | 3.88 | 1.53 | 66.4 | 33.6 | 0.5127 | 0.1563 |

3 | 0.2294 | 5.827 | 4.36 | 1.72 | 52.6 | 26.7 | 0.6465 | 0.1970 |

4 | 0.2043 | 5.189 | 4.89 | 1.93 | 41.7 | 21.2 | 0.8152 | 0.2485 |

5 | 0.1819 | 4.621 | 5.50 | 2.16 | 33.1 | 16.8 | 1.028 | 0.3133 |

6 | 0.1620 | 4.115 | 6.17 | 2.43 | 26.3 | 13.3 | 1.296 | 0.3951 |

7 | 0.1443 | 3.665 | 6.93 | 2.73 | 20.8 | 10.5 | 1.634 | 0.4982 |

8 | 0.1285 | 3.264 | 7.78 | 3.06 | 16.5 | 8.37 | 2.061 | 0.6282 |

9 | 0.1144 | 2.906 | 8.74 | 3.44 | 13.1 | 6.63 | 2.599 | 0.7921 |

10 | 0.1019 | 2.588 | 9.81 | 3.86 | 10.4 | 5.26 | 3.277 | |

11 | 0.0907 | 2.305 | 11.0 | 4.34 | 8.23 | 4.17 | 4.132 | 1.260 |

12 | 0.0808 | 2.053 | 12.4 | 4.87 | 6.53 | 3.31 | 5.211 | 1.588 |

13 | 0.0720 | 1.828 | 13.9 | 5.47 | 5.18 | 2.62 | 6.571 | 2.003 |

14 | 0.0641 | 1.628 | 15.6 | 6.14 | 4.11 | 2.08 | 8.286 | 2.525 |

15 | 0.0571 | 1.450 | 17.5 | 6.90 | 3.26 | 1.65 | 10.45 | 3.184 |

16 | 0.0508 | 1.291 | 19.7 | 7.75 | 2.58 | 1.31 | 13.17 | |

17 | 0.0453 | 1.150 | 22.1 | 8.70 | 2.05 | 1.04 | 16.61 | 5.064 |

18 | 0.0403 | 1.024 | 24.8 | 9.77 | 1.62 | 0.823 | 20.95 | 6.385 |

19 | 0.0359 | 0.912 | 27.9 | 11.0 | 1.29 | 0.653 | 26.42 | |

20 | 0.0320 | 0.812 | 31.3 | 12.3 | 1.02 | 0.518 | 33.31 | 10.15 |

21 | 0.0285 | 0.723 | 35.1 | 13.8 | 0.810 | 0.410 | 42.00 | 12.80 |

22 | 0.0253 | 0.644 | 39.5 | 15.5 | 0.642 | 0.326 | 52.96 | 16.14 |

23 | 0.0226 | 0.573 | 44.3 | 17.4 | 0.509 | 0.258 | 66.79 | 20.36 |

24 | 0.0201 | 0.511 | 49.7 | 19.6 | 0.404 | 0.205 | 84.22 | 25.67 |

25 | 0.0179 | 0.455 | 55.9 | 22.0 | 0.320 | 0.162 | 106.2 | 32.37 |

26 | 0.0159 | 0.405 | 62.7 | 24.7 | 0.254 | 0.129 | 133.9 | 40.81 |

27 | 0.0142 | 0.361 | 70.4 | 27.7 | 0.202 | 0.102 | 168.9 | 51.47 |

28 | 0.0126 | 0.321 | 79.1 | 31.1 | 0.160 | 0.0810 | 212.9 | 64.90 |

29 | 0.0113 | 0.286 | 88.8 | 35.0 | 0.127 | 0.0642 | 268.5 | 81.84 |

30 | 0.0100 | 0.255 | 99.7 | 39.3 | 0.101 | 0.0509 | 338.6 | 103.2 |

31 | 0.00893 | 0.227 | 112 | 44.1 | 0.0797 | 0.0404 | 426.9 | 130.1 |

32 | 0.00795 | 0.202 | 126 | 49.5 | 0.0632 | 0.0320 | 538.3 | 164.1 |

33 | 0.00708 | 0.180 | 141 | 55.6 | 0.0501 | 0.0254 | 678.8 | 206.9 |

34 | 0.00630 | 0.160 | 159 | 62.4 | 0.0398 | 0.0201 | 856.0 | 260.9 |

35 | 0.00561 | 0.143 | 178 | 70.1 | 0.0315 | 0.0160 | 1079 | 329.0 |

36 | 0.00500 | 0.127 | 200 | 78.7 | 0.0250 | 0.0127 | 1361 | 414.8 |

37 | 0.00445 | 0.113 | 225 | 88.4 | 0.0198 | 0.0100 | 1716 | 523.1 |

38 | 0.00397 | 0.101 | 252 | 99.3 | 0.0157 | 0.00797 | 2164 | 659.6 |

39 | 0.00353 | 0.0897 | 283 | 111 | 0.0125 | 0.00632 | 2729 | 831.8 |

40 | 0.00314 | 0.0799 | 318 | 125 | 0.00989 | 0.00501 | 3441 | 1049 |

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