Building Load Amperage Calculator

This building load amperage calculator will allow you to calculate the probable current draw within the facility based on HP and voltage.

With this information you will have a good idea whether the electrical transformer will be able to handle the building load.

It is also possible to determine the current draw of various motors at various HP.

Motor Full Load Current in Amperes

--------1 Phase AC-------------3 Phase AC

HP-----115 V---230 V---115--208---460---575

1/4-----5.8-----2.9

1/3-----7.2-----3.6

1/2-----9.8-----4.9-----4.0---2.2---1.1----.8

3/4----13.8-----6.9-----5.6---3.1---1.4---1.1

1------16.0-----8.0-----7.2---4.0---1.8---1.4

1 1/2--20.0----10.0----10.4---5.7---2.6---2.1

2------24.0----12.0----13.6---7.5---3.4---2.7

3------34.0----17.0----------10.6---4.8---3.9

5------56.0----28.0----------16.7---7.6---6.1

7 1/2--80.0----40.0----------24.2--11.0---9.0

10----100.0----50.0----------30.8--14.0--11.0

20---------------------------59.4--27.0--22.0

25---------------------------74.8--34.0--27.0

50--------------------------143.0--65.0--52.0

75--------------------------211.2--96.0--77.0

100-------------------------272.8-124.0--99.0

150-------------------------396.0-180.0-144.0