**Watts to btu’s** = watts x 3.413

**Btu’s to watts** = btu’s / 3.413

**Three phase resistive watts** = (Amps1 x Volts1) + (A2 x V2) + (A3 x V3) / 1.732 (which is the square root of 3)

**Single phase resistive watts** = volts x amps

**Three phase inductive watts (motors)** = (Amps1 x Volts1) + (A2 x V2) + (A3 x V3) / 1.732 x power factor

**Single phase inductive watts (motors)** = volts x amps x power factor

**Ohms Law:** E/IR: Ohms = volts / amps (R=E/I), amps = volts / ohms (I=E/R), volts = amps x ohms (E=IR)

*The current I in amps is equal to 1000 times the power P in kilowatts, divided by the voltage V in volts:*

**I(A)** = 1000 × P(kW) / V(V)

*So amps are equal to 1000 times kilowatts divided by volts*

**amps** = 1000 × kilowatts / volts

*The current I in amps is equal to 1000 times the real power P in kilowatts, divided by the power factor PF times the voltage V in volts:*

I = 1000 × P / (PF × V )

So amps are equal to 1000 times kilowatts divided by power factor times volts.

**amps **= 1000 × kilowatts / (PF × volts)

*The current I in amps is equal to 1000 times the real power P in kilowatts, divided by square root of 3 times the power factor PF times the line to line RMS voltage VL-L in volts:*

**I** = 1000 × P / (√3 × PF × VL-L )

*So amps are equal to 1000 times kilowatts divided by square root of 3 times power factor times volts.*

**amps** = 1000 × kilowatts / (√3 × PF × volts)

The Calculating tool uses both quantitative data and qualitative information covering HVAC design, installation and operation to benchmark energy efficient performance and identify potential areas for improvement.

**User warning: all this results are based on quick estimate calculation. Exact heat /cool load can be determined with a full heat and cool load analysis**

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